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polyacrylamide thermal stability in armenia

  • Thermal stability of high-molecular-weight

    The above reported data show that temperature affects the stability of commercial polyacrylamide solutions in two different ways: The first process that increases the anionic character of polymers is responsible for the viscosity loss in the presence of monovalent salts and for eventual precipitation in the presence of divalent salts even if the molecular weight is not changed.Such a process will be …

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  • Thermal stability of polyacrylamide solutions: effect of ...

    We have investigated the effect of temperature on the chemical (hydrolysis) and thermal (molecular weight) stability of purified polyacrylamide solution.From viscosity and light scattering data we show that no polymer degradation due to oxygen contamination results from heating polymer solutions although higher temperature is responsible for hydrolysis of amide groups.

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  • The thermal degradation of polyacrylamide with

    2000-2-1 · In this study, we examined the thermal stability of polyacrylamide stabilized, by the introduction of metal additives. Moreover, we investigated the effect of three adsorbed metal ions on the thermal degradation of polyacrylamide by using Flynn's analytical model. 2. Experimental.

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  • Thermal Stability of Immobilized Glucoamylase

    2014-9-9 · The thermal stability of immobilized glucoamylase entrapped in polyacrylamide gels was enhanced slightly compared with glucoamylase in free solution, and was independent of the acrylamide monomer concentration and N, N ′-methylene-bis (acrylamide) content.

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  • Stability of Partially Hydrolyzed Polyacrylamides at ...

    2009-6-29 · years at 120°C. Within our experimental error, HPAM stability was the same with/without oil (decane). An acrylamide-AMPS copolymer (with 25% AMPS) showed similar stability to that for HPAM. Stability results were similar in brines with 0.3% NaCl, 3% NaCl, or 0.2% NaCl + 0.1% NaHCO3. At temperatures of 160°C and above, the polymers were more stable

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  • Mechanism of Polyacrylamide Hydrogel Instability on

    It has been widely accepted that the loss of gel thermal stability can be explained via three aspects: the rupture of polymer chains, the breakage of cross-linker chains, and hydrolysis of polymer. The mechanism of hydrogel syneresis through polymer hydrolysis has been investigated extensively in …

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  • Investigation of the degradation and stability of ...

    2016-12-1 · In order to observe the stability of acrylamide-based polymers in acid, the above four types of prepared polymers were assembled into eight polymer solutions (two replications of each polymer type), with viscosity ranging from 10 to 30 cp. Hydrochloric acid was then added to the eight polymer solutions to comprise 1 wt% HCl and 10 wt% HCl solutions for each polymer solution.

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  • Polyacrylamide crosslinked by bis-vinylimidazolium

    2019-9-3 · Ionic liquids, which are defined as molten salts having melting points lower than 100 °C, have proved quite versatile for enabling a range of exciting applications due to their unique properties such as nonvolatility, high thermal stability and friendly to environment. 13 Ionic liquids with divinyl moieties could be employed as crosslinker to copolymerized with monomers for polymer preparation. 14–16 For …

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  • Polyacrylamide degradation and its implications in ...

    2018-9-7 · Thermal degradation of polyacrylamide (in the absence of free radicals) does not cause substantial chain scission except at very high temperatures, on the order of 300 °C.

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  • Hydrolysis and thermal stability of partially hydrolyzed ...

    Partially hydrolyzed polyacrylamide (HPAM) is the water‐soluble polymer most often used in flooding applications in the petroleum industry. However, in aqueous solutions at high temperatures, HPAM undergoes hydrolysis of the lateral amide groups, and the presence of salts in the solution can lead to precipitation of this polymer.

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  • Mechanical and Thermal Stability of Polyacrylamide

    2013-4-8 · The exceptional mechanical and thermal stability of the polyacrylamide-based microgels and their easiness to be tailored for the required application make these chemicals excellent candidates as future sweep improvers under harsh reservoir conditions in which other conventional polymers might fail.

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  • Thermal Stability of Immobilized Glucoamylase

    2014-9-9 · Glucoamylase[α-1,4: 1,6-glucan-4: 6-glucohydroease, EC 3.2.1.3] from Rhizopus niveus was entrapped in polyacrylamide gels and adsorbed onto SP-Sephadex C–50 to elucidate the thermostability mechanism of immobilized enzymes. The thermal stability of immobilized glucoamylase entrapped in polyacrylamide gels was enhanced slightly compared with glucoamylase in free solution, and was …

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  • Stability of Partially Hydrolyzed Polyacrylamides at ...

    2009-6-29 · years at 120°C. Within our experimental error, HPAM stability was the same with/without oil (decane). An acrylamide-AMPS copolymer (with 25% AMPS) showed similar stability to that for HPAM. Stability results were similar in brines with 0.3% NaCl, 3% NaCl, or 0.2% NaCl + 0.1% NaHCO3. At temperatures of 160°C and above, the polymers were more ...

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  • Thermal Stability of r-Amylase from Aspergillus oryzae ...

    2003-9-8 · the thermal stability (50-75 °C) of Aspergillus oryzaeR-amylase immobilized in polyacrylamide gel in phosphate buffer, mashed potatoes, and minced shrimp was examined. Changing the cross-linking agent concentration from 3.3 to 5.3% and adding 2% salt did not markedly affect the thermal stability of the immobilized R-amylase.

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  • Chemical Stability Limits of Water-Soluble Polymers

    Thermal Stability of Polyacrylamides in Oilfield Brines Containing Ca2+, Ions. In the absence of oxidative degradation, it has been well established that the backbone chain of vinyl polymers, such as polyacrylamide, is quite thermally stable to temperatures as high as 120 degrees C [248 degrees F].

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  • Hydrolysis and thermal stability of partially hydrolyzed ...

    Partially hydrolyzed polyacrylamide (HPAM) is the water‐soluble polymer most often used in flooding applications in the petroleum industry. However, in aqueous solutions at high temperatures, HPAM undergoes hydrolysis of the lateral amide groups, and the presence of salts in the solution can lead to precipitation of this polymer.

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  • Design and Study of a Novel Thermal-Resistant and

    Abstract: Water-soluble polymers are widely used in oilfields.The rheological behaviors of these polymers in high-salinity solution are very important for stimulation of high-salinity reservoirs. In this work, a novel thermal-resistant and shear-stable amphoteric polyacrylamide (PASD), prepared from acrylamide (AM), sodium styrene sulfonate (SSS), and acryloxyethyl trimethylammonium chloride ...

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  • Polyacrylamide PAM Flocculant for Water Treatment -

    Polyacrylamide PAM, with the chemical formula of (C3H5NO)n and the CAS NO. of 9003-05-8, is a linear polymer. Polyacrylamide polymer has good thermal stability, can be dissolved in water in any proportion, and the aqueous solution is a uniform and transparent liquid. PAM is one of the most widely used water-soluble polymers.

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  • Design and Study of a Novel Thermal-Resistant and

    2021-5-12 · Shape-Stable Hydrated Salts/Polyacrylamide Phase-Change Organohydrogels for Smart Temperature ACS Applied Materials & Interfaces ( IF 9.229) Pub Date : 2021-04-27, DOI: 10.1021 Chenxiao Yin, Ji Lan, Xiangdong Wang, Yulin Zhang, Rong Ran, Ling-Ying Shi

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  • Mechanical and Thermal Stability of Polyacrylamide

    2013-4-8 · The exceptional mechanical and thermal stability of the polyacrylamide-based microgels and their easiness to be tailored for the required application make these chemicals excellent candidates as future sweep improvers under harsh reservoir conditions in which other conventional polymers might fail.

    Get Price
  • Mechanical and thermal stability of polyacrylamide

    The exceptional mechanical and thermal stability of the polyacrylamide-based microgels and their easiness to be tailored for the required application make these chemicals excellent candidates as future sweep improvers under harsh reservoir conditions in which other conventional polymers might fail.

    Get Price
  • Thermal Stability of r-Amylase from Aspergillus oryzae ...

    2003-9-8 · the thermal stability (50-75 °C) of Aspergillus oryzaeR-amylase immobilized in polyacrylamide gel in phosphate buffer, mashed potatoes, and minced shrimp was examined. Changing the cross-linking agent concentration from 3.3 to 5.3% and adding 2% salt did not markedly affect the thermal stability of the immobilized R-amylase.

    Get Price
  • Thermal stability of sulfonated polymers

    Modifications of polyacrylamide structure have been proposed to postpone their thermal stability to higher temperatures. Monomers such as acrylamido methylpropane sulfonate (AMPS) or sulfonated styrene/maleic anhydride can be used to prevent acrylamide comonomer from hydrolysis. The aim of this work is to study under controlled conditions, i.e ...

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  • Chemical Stability Limits of Water-Soluble Polymers

    Thermal Stability of Polyacrylamides in Oilfield Brines Containing Ca2+, Ions. In the absence of oxidative degradation, it has been well established that the backbone chain of vinyl polymers, such as polyacrylamide, is quite thermally stable to temperatures as high as 120 degrees C [248 degrees F].

    Get Price
  • Polyacrylamide crosslinked by bis-vinylimidazolium

    2019-9-3 · A series of ionic compounds 1,n-dialkyl-3,3′-bis-l-vinylimidazolium bromide (C n VIM) are prepared and employed to crosslink acrylamide for polyacrylamide (PAAM) hydrogel preparation via in situ solution polymerization. The swelling behavior, mechanical properties and thermal stability of the prepared C n VIM crosslinked PAAM hydrogels are investigated.

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  • Hydrolysis and thermal stability of partially hydrolyzed ...

    Partially hydrolyzed polyacrylamide (HPAM) is the water‐soluble polymer most often used in flooding applications in the petroleum industry. However, in aqueous solutions at high temperatures, HPAM undergoes hydrolysis of the lateral amide groups, and the presence of salts in the solution can lead to precipitation of this polymer.

    Get Price
  • Directed evolution of formate dehydrogenase from

    2006-7-31 · Thermal stability increased at the exchange of lysine and glutamic acid, but decreased due the exchange of cysteine. Overall, the variants reveal very suitable properties for application in a technical synthetic process, enabling use of entrapment in polyacrylamide as an economic and versatile immobilization method.

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  • An electrically conductive

    2021-3-1 · A hydrogel composite that consists of micrometre-sized silver flakes suspended in a polyacrylamide–alginate hydrogel matrix exhibits a high electrical …

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  • Polyacrylamide,PAM,CH2CHCONH2 by Guizhou Viton

    Polyacrylamide is a line type high molecular polymer, its formula is (CH2CHCONH2)n, and abbreviation is PAM. Polyacrylamide can be dissolved in the water easily; however, it is very difficult to dissolve in the general organic solvents, such as benzene, aether, esters and propanone etc. The aqueous solution of PAM is a non-dangerous, viscous ...

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  • Mechanical and thermal stability of polyacrylamide

    The exceptional mechanical and thermal stability of the polyacrylamide-based microgels and their easiness to be tailored for the required application make these chemicals excellent candidates as future sweep improvers under harsh reservoir conditions in which other conventional polymers might fail.

    Get Price
  • hpam hydrolyzed polyacrylamide in bolivia |

    2021-5-23 · Hydrolysis and thermal stability of partially hydrolyzed polyacrylamide in high‐salinity environments - Oliveira - 2019 - Journal of Applied. Partially hydrolyzed polyacrylamide (HPAM) is the water‐soluble polymer most often used in flooding applications in the petroleum industry.

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  • Synthesis and Thermal Stability of Glyoxalated Alkali ...

    Synthesis and Thermal Stability of Glyoxalated Alkali Lignin-Polyvinylpyrrolidone Resins Aikfei Ang,a,* Zaidon Ashaari,a Edi S. Bakar,a and Ibrahim Nor Azowab Natural, renewable, and non-toxic lignin-based resin was synthesized through copolymerization with monomeric N-vinyl-2-pyrrolidone (VP) in

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  • Experimental analyses and molecular simulation of the ...

    In the current study, two diverse cellulose models (water only; water, dicyandiamide, melamine and polyacrylamide) are developed and analyzed. Numerous model variables, including the diffusion coefficient of water and cellulose chain distance, are collated, in order to examine the effects of amines on the thermal stability of cellulose.

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  • Onset Kinetics of Thermal Degradation of Ultrathin ...

    2021-3-12 · There are several pathways through which a polymer can degrade such as thermal, photoinduced, biological, chemical and mechanical. The thermal degradation process of polymers is widely studied because of both academic and industrial interest. Here we have investigated the kinetics of thermal degradation and structural modification of polyacrylamide ultrathin films as a result of heat …

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  • Immobilization of acrylamide-modified

    1999-1-1 · To test the thermal stability of the gel attachment, polyacrylamide beads (25 µl volume) containing 5′-acrylamide oligonucleotides or unmodified oligonucleotides of identical sequence were prepared (Materials and Methods) and subjected to a standard …

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  • Synthesis and properties of polyacrylamide by ...

    2017-1-1 · Polyacrylamide (PAM)-encapsulated clay nanoparticles (NPs) were successfully synthesised by conventional emulsion polymerisation for solving the aggregation matter of nanoscaled clay. A novel nanofluid based on PAM has been developed and its’ attributes have been experimentally tested as an optimised solution.

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  • [PDF] Thermal Stability of α-Amylase from Aspergillus ...

    To determine the suitability as a time−temperature indicator for dielectric pasteurization processes, the thermal stability (50−75 °C) of Aspergillus oryzae α-amylase immobilized in polyacrylamide gel in phosphate buffer, mashed potatoes, and minced shrimp was examined. Changing the cross-linking agent concentration from 3.3 to 5.3% and adding 2% salt did not markedly affect the thermal ...

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  • Synthesis of a Cationic Polyacrylamide under UV

    A ternary cationic polyacrylamide (CPAM) with the hydrophobic characteristic was prepared through ultraviolet- (UV-) initiated polymerization technique for the estrone (E1) environmental estrogen separation and removal. The monomers of acrylamide (AM), acryloyloxyethyl-trimethyl ammonium chloride (DAC), and acryloyloxyethyl dimethylbenzyl ammonium chloride (AODBAC) were used to …

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  • Structural, Morphological, Vibrational, Thermal and ...

    2020-12-23 · Title:Structural, Morphological, Vibrational, Thermal and Optical Properties of ZnS Quantum Dots in the Polymer Matrix VOLUME: 3 ISSUE: 1 Author(s):Feroz A. Mir*, Owais I. Mir and Rayees A. Zargar Affiliation:Department of Physics, BGSB University Rajouri-185234, J&K, Department of Anatomy, NIMS University, Jaipur-303121, Rajasthan, Department of Physics, BGSB University Rajouri-185234, …

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  • Thermal stability of polyacrylamide solutions: effect of ...

    SummaryWe have investigated the effect of temperature on the chemical (hydrolysis) and thermal (molecular weight) stability of purified polyacrylamide solution.From viscosity and light scattering data we show that no polymer degradation due to oxygen contamination results from heating polymer solutions although higher temperature is responsible for hydrolysis of amide groups.

    Get Price
  • Thermal stability of sulfonated polymers

    Modifications of polyacrylamide structure have been proposed to postpone their thermal stability to higher temperatures. Monomers such as acrylamido methylpropane sulfonate (AMPS) or sulfonated styrene/maleic anhydride can be used to prevent acrylamide comonomer from hydrolysis. The aim of this work is to study under controlled conditions, i.e ...

    Get Price
  • mechanical and thermal stability of polyacrylamide

    Mechanical and Thermal Stability of Polyacrylamide-based. The exceptional mechanical and thermal stability of the polyacrylamide-based microgels and their easiness to be tailored for the required application make these chemicals excellent candidates as future sweep improvers under harsh reservoir conditions in which other conventional polymers might fail.

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  • Rheological and thermal stability of novel weak gels

    2016-10-25 · The present study deals with weak gels based on sulfonated polyacrylamide (SPA)/scleroglucan (SC)/Cr 3+ with an exceptional thermal stability in electrolyte media. The rheological results showed that on increasing the SC concentration the shear viscosity and storage modulus of the SPA/SC/Cr 3+ system were increased and the dependence of the storage modulus on frequency …

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  • Comparison of the thermal stabilities of reverse ...

    In this study, we compared the thermal stabilities of AMV RT and MMLV RT by observing their irreversible thermal inactivation. The temperatures reducing initial activity by 50% in 10-min incubation, T(50), of AMV RT were 47 degrees C without the template-primer (T/P), poly(rA)-p(dT)(12-18), and 52 degrees C with the T/P (28 microM).

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  • Improved rheology and high-temperature stability of ...

    2020-2-5 · 1 Improved rheology and high-temperature stability of hydrolysed polyacrylamide using graphene oxide nanosheet Maje Alhaji Haruna1, Shahid Pervaiz1, Zhongliang Hu1, Ehsan Nourafkan1, Dongsheng Wen1, 2* 1School of Chemical and Process Engineering, University of Leeds, Leeds, U.K. 2School of Aeronautic Science and Engineering, Beihang University, Beijing

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  • Thermal Stability of Immobilized Glucoamylase

    Glucoamylase[α-1,4: 1,6-glucan-4: 6-glucohydroease, EC 3.2.1.3] from Rhizopus niveus was entrapped in polyacrylamide gels and adsorbed onto SP-Sephadex C–50 to elucidate the thermostability mechanism of immobilized enzymes. The thermal stability of immobilized glucoamylase entrapped in polyacrylamide gels was enhanced slightly compared with glucoamylase in free solution, and was independent ...

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  • (217ay) Effect of Salts On Polyacrylamide Hydrolysis

    2013-11-4 · The thermal stability of the PAM/PEI polymeric gels was examined in bulk at 150 o C (302 o F) for about 16 weeks. Samples prepared in sea water showed more stability compared to distilled and field water samples.

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  • An electrically conductive

    2021-3-1 · A hydrogel composite that consists of micrometre-sized silver flakes suspended in a polyacrylamide–alginate hydrogel matrix exhibits a high electrical …

    Get Price
  • Synthesis of AM-co-NVP and Thermal Stability in

    The experimental results indicate that AM-co-NVP has excellent thermal stability in saline solution compared to partially hydrolyzed polyacrylamide (HPAM). What is more, the copolymer exhibited the most perfect thermal tolerance in high divalent saline solution when …

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  • Disulfide Bonds and Thermal Stability in T4 Lysozyme

    Disulfilde bonds and thermal stability in T4 lysozyme ... polyacrylamide gels as described (15). Variants containing the Ile-3 -* Cys-3, Cys-54 -+ Thr-54, Cys-54 -* Val-54, and ... Stability is more rigorously characterized as the free energy of denaturation at a given temperature, AG(T), which may be

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  • A KINETIC ANAYSIS OF THE DEGRADATION OF GRAFTED

    2010-3-26 · Grafted anionic polyacrylamide gel has been synthesised in the laboratory following radical polymerisation process. Kinetics of thermal degradation of synthesised gel was evaluated under nonisthothermal condition by integral approximation method to determine the thermal stability of the material from thermogavometric study.

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  • Patcharin, R., T. Juming, and A. R. Barbara, “Thermal ...

    Patcharin, R., T. Juming, and A. R. Barbara, “Thermal stability of α-amylase from Aspergillus oryzae entrapped in polyacrylamide gel”, J. Agri. Food Chem. 51: 5462-5466, 2003. has been cited by the following article: ... (BSA) as a modifier was used with glutaraldehyde as a binder to study the activity and thermal stability of ...

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  • CiteSeerX — The thermal stability of DNA fragments

    CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Temperature-Gradient Gel Electrophoresis (TGGE) was employed to determine the thermal stabilities of 28 DNA fragments, 373 bp long, with two adjacent mismatched base pairs, and eight DNAs with Watson– Crick base pairs at the same positions. Heteroduplex DNAs containing two adjacent mismatches were formed by melting ...

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  • Synthesis of Metal Oxide Inverse Opals from Metal

    2020-6-22 · When the nitrate precursors have a lower thermal stability than the PMMA template, we have modified the metal nitrates by chelating or by polyacrylamide gelation to form more stable precursor networks. Abstract. For the synthesis of metal oxide inverse opals, it is essential to consider the physical and chemical changes of the precursors ...

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  • Heavy Oil and High-Temperature Polymer EOR

    2020-12-17 · Polymer flooding represents the most common chemical enhanced oil recovery (CEOR) method used at commercial scale. In this process, the polymeric solutions (generally hydrolyzed polyacrylamide - HPAM) are injected to improve the oil/water mobility ratio (M). However, due to mechanical, chemical, bio, and thermal degradation, polymer viscosity losses can occur, causing a …

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  • SOY PROTEIN HYDROLYSATE; SOLUBILITY, THERMAL

    2016-5-18 · thermal stability, solutions (5% w/v) of hydrolysates and SPI were subjected to heat treatment at 95°C for 60 min followed by centrifugation and determination of protein content in the supernatant using a nitrogen analyzer. Solubility and thermal stability at different protein concentrations (1%, 2.5%, 5%, and 7%) in a black tea beverage

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  • Polyacrylamide-Phytic Acid-Polydopamine

    2011-6-28 · Actuator materials based on graphene oxide/polyacrylamide composite hydrogels prepared by in situ polymerization ... A one-step strategy for thermal- and pH-responsive graphene oxide interpenetrating polymer hydrogel networks (2011) ...

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  • Synthesis and evaluation of partially hydrolysed ...

    2016-7-20 · 35 .SA. The thermal stability of PHPA solution was evaluatged in a Parr pressure reactor at ap-propriate temperature. The completely formulated muds were pre-pared using the synthesized PHPA as viscosifier, polyanionic cellulose (PAC) or carboxy methyl cellulose (CMC) as fluid loss controlling agent, and sodium salt of sulphonated asphaltene as

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  • (217ay) Effect of Salts On Polyacrylamide Hydrolysis

    2013-11-4 · The thermal stability of the PAM/PEI polymeric gels was examined in bulk at 150 o C (302 o F) for about 16 weeks. Samples prepared in sea water showed more stability compared to distilled and field water samples.

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  • Polyacrylamide-metal nanocomposites : one-pot

    Polyacrylamide-metal nanocomposites: one-pot synthesis, antibacterial properties, and thermal stability Li, Cuiyan Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.

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  • Preparation and properties of amphiphilic

    2020-5-20 · Hu et al. synthesized β-cyclodextrin-functionalized polyacrylamide/MMT nanocomposites, which exhibited better temperature resistance, salts tolerance, rheological properties, thermal stability and higher viscosity than pure polymer . However, research on properties of aqueous solution of water-soluble amphiphilic hydrophobically associative ...

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  • Isolation and Thermal Stabilization of Bacteriocin Nisin ...

    Testing of Thermal Long-Term Stability It is known that proteins are sensitive to heat treatment, especially in relation to long-term stability and activity [ 29 ]. In this study, thermal stability of nisin products was observed during storage (up to 165 days) at four different temperatures representing conditions of production (−18°C ...

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  • From Crisis to Stability in the Armenian Power Sector ...

    15-20% solid content. pH 3-5. Amphoteric, Cationic and Anionic Charge. Improve paper properties. Assist the retention of fines, filler and sizing agents. Improve drainage & reduce steam consumption. Lower COD & BOD values in waste water. Single use application and able to be used in a wide range of pH. Easy to dilute as it’s water soluble.

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  • Polyacrylamide Gel Electrophoresis | Cleaver Scientific

    2001-11-1 · The temperature response of Rubisco and activase were examined previously over the range of temperatures from 25°C to 50°C (Crafts-Brandner and Salvucci, 2000).To compare the thermal stability of these enzymes, we extended the temperature range and directly compared the specific activities of the two enzymes at each temperature (Fig. 1).The rate of carboxylation by isolated Rubisco …

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  • Malayan Adhesives And Chemicals Sdn Bhd | Since 1965

    1996-2-1 · Introduction. Most investigations on the structure and stability of DNA duplexes containing non-Watson—Crick base pairs have focused on isolated defects (1, 2).An isolated mismatched base pair or extra base can occur through replication errors, which, if not repaired, lead to mutations ().Studies have examined DNA oligonucleotides and DNA fragments with isolated mismatched base pairs or an ...

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