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2010-6-11 · Cassava starch-g-polyacrylamide (PAM) was successfully prepared by a reactive batch processing using a specially designed batch reactor resulting in a superabsorbent polymer (SAP) with water absorption of 605 g/g being obtained under the optimized reaction conditions. The occurrence of a graft copolymer was confirmed by FT-IR spectra, where it was found to exhibit all characteristic bands …
Get PriceGraft copolymers of starch and polyacrylamide (PAAm) were prepared by reactive extrusion using a co-rotating twin-screw extruder and ammonium persulfate initia- tor. Feed rates were 109 g/min to 325 g/min (all components) at a moisture con- tent of 500% with screw speeds in …
Get Price2000-10-19 · A novel starch‐graft‐polyacrylamide/clay superabsorbent composite is synthesized by graft copolymerization reaction of acrylamide, potato starch and clay mineral micropowder, followed by hydrolysis with sodium hydroxide. The water absorbency of the composite reaches 4 000 g H 2 O/g. The influence of kind and amounts of clay and of the crosslinker in the composite on the absorbent …
Get Price2006-3-18 · Recently we have shown that starch–polyacrylamide graft copolymers can be produced with high conversion and grafting efficiency using a corotating twin screw extruder [14, 15]. Here we report the production of polyacrylamide (PAAm) graft copolymers using various unmodified and modified starches, as well as dextrin, dextran, and polyvinyl alcohol as substrates.
Get Priceproduction of starch graft copolymers with reduced water requirements [12, 13]. Carr et al. [13] demonstrated that starch–polyacrylonitrile graft copolymers prepared by reactive extrusion could, after saponification, absorb approximately 300 times their weight in water. Recently we have shown that starch–polyacrylamide
Get Price2012-11-1 · Polyacrylamide grafted starch (St-g-PAM) has been synthesized by microwave assisted method involving a synergism of microwave radiation and ceric ammonium nitrate (CAN) to initiate the grafting reaction. The synthesis was optimized in terms of CAN and monomer (acrylamide) concentration.
Get PriceRecently we have shown that starch–polyacrylamide graft copolymers can be produced with high conversion Keywords Starch Æ Graft copolymer Æ Reactive and grafting efficiency using a corotating twin screw extrusion Æ Polyacrylamide extruder [14, 15].
Get PriceStarch is a natural biopolymer that subjected to various chemical modifications through different industrial applications. Molecular structure of starch allow its grafting with different vinyl monomers in the presence of crosslinking agents to synthesize cross-linked hydrogels, which used in enhanced oil recovery (EOR) applications, water shutoff and drag reduction.
Get PriceAs shown in FIG. 1, starch or micro-crystalline cellulose used as back-bone, using potassium permanganate as initiator, graft-copolymerizes with acrylamide to produce starch-g-polyacrylamide or micro-crystalline cellulose-g-polyacrylamide, wherein, the graft copolymer as basic polymer, after hydrolyzed with sodium hydroxide, is cationized by reacting with dialkylamino carbinol, additives being …
Get Price2017-11-16 · remove any impurities and dried overnight at 60 C. Starch (St) graft polyacrylamide (PAAm-g-St) was also synthe-sized by the same procedure as above in the absence of nanoclay. The high amount of MMT ([2000 ppm) hin-dered the polymerization process, and the high amount of starch ([2.0 g) resulted in a low product yield. Finally,
Get Price2003-10-1 · Graft copolymers of starch and polyacrylamide (PAAm) were prepared by reactive extrusion using a co‐rotating twin‐screw extruder and ammonium presulfate initiator. Feed rates were 109 g/min to 325 g/min (all components) at a moisture content of 50%, with screw speeds in the range 100 rpm to 300 rpm. Starch/acrylamide weight ratios ranged from 5:1 to 1.3:1. Conversions of acrylamide to PAAm ...
Get PriceFor example, when polyacrylamide is attached to the starch, creating a starch graftpolyacrylamide (SPAM), the amount of water than can be absorbed increases dramatically. The produced SPAMs will have utility in paper production, drilling muds, water treatment or cosmetics. It is known that by changing the reaction conditions, the product of a ...
Get PriceJ Polym Environ (2006) 14:125–129 DOI 10.1007/s10924-006-0002-y ORIGINAL PAPER Reactive Extrusion of Starch–Polyacrylamide Graft Copolymers Using Various Starches J. L. Willett Æ V. L. Finkenstadt Published online: 18 March 2006 Springer Science+Business Media, Inc. 2006 Abstract Graft copolymers of polyacrylamide and vari- Introduction ous substrates were prepared by reactive …
Get PriceA starch-polyacrylamide graft copolymer has been synthesized in water by means of horseradish peroxidase (HRP)/H2O2/acetylacetone (ACAC). It is discussed through single factor experiment that the effects of system pH, reaction temperature and amount of HRP on the residual acrylamide (AAM) content. The results show that the ideal copolymer was synthesized when mass ratio of starch and …
Get PriceThe present invention discloses a process for manufacturing a grafted polyacrylamide flocculant of cationic/ampholytic ions, which is characterized by graft-copolymerizing starch or micro-crystalline cellulose as backbone with acrylamide, while using potassium permanganate as initiator, hydrolyzing and thereafter reacting with alkyl-amino-carbinol.
Get PriceAbstract: By means of solution polymerization, a series of cross-linked starch-g-polyacrylamide montmorillonite (St-g-PAM/MMT) nanocomposites were prepared and used to adsorb methylene blue (MB). The effects of different preparation conditions on the adsorption capacity of the nanocomposites were investigated.
Get Price2020-3-24 · production of high-performance starch-based materials. Extrusion processing is one of the most versatile and energy-efficient technologies currently used across various industries for low-cost manufacture of starch-based products such as food, paper, and textiles (Fanta, Felker, & Shogren, 2012; Kalambur & Rizvi, 2006; Wolf, 2010).
Get PriceThe highest amylase production was achieved by growing S. gulbargensis DAS 131 in media with 1% starch. Strain exhibited maximal activity at pH 9.0 and 45 degrees C and relatively stable in alkaline conditions (pH 11). Starch and peptone were found to be the good source of carbon and nitrogen with a yield of 2,216.6 and 2,156.1 U, respectively.
Get PriceThe present invention discloses a process for manufacturing a grafted polyacrylamide flocculant of cationic/ampholytic ions, which is characterized by graft-copolymerizing starch or micro-crystalline cellulose as backbone with acrylamide, while using potassium permanganate as initiator, hydrolyzing and thereafter reacting with alkyl-amino-carbinol.
Get Pricemethacrylates onto starch have been published (Lipsa et al. 2013; El-Hamshary et al. 2015), less attention has been paid to the grafting of polyacrylamide (PAM) onto CMS and its application as a paper dry-strength agent. In this study, a CMS grafted PAM copolymer (CMS-g-PAM) was synthesized and used as a paper dry-strength agent.
Get PriceStarch- based adhesives are capable of wetting polar surfaces such as cellulose, penetrating pores, and forming strong bonds through mechanical and physical bonds. This paper studies the modification of starch by grafting with acrylamide, and the relation between m
Get Price2017-11-28 · TUGAS AKHIR TK141581 PEMBUATAN FLOKULAN STARCH-g-POLYACRYLAMIDE DENGAN GRAFTING TO Akhmat Fauzi NRP 23121 100 152 Dosen Pembimbing Dr. Ir. Sumarno, M.Eng NIP. 1964 06 08 1991 02 1001 Prida Novarita T., ST., MT
Get PriceCiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Partial hydrolysis of the Starch-g-Polyacrylamide was carried out in alkaline medium. Three grades of partially hydrolysed products were synthesized by varying the reaction parameters. The neutralization equivalent of these products was determined by titrating with standard NaOH solution.
Get Price2003-10-1 · Graft copolymers of starch and polyacrylamide (PAAm) were prepared by reactive extrusion using a co‐rotating twin‐screw extruder and ammonium presulfate initiator. Feed rates were 109 g/min to 325 g/min (all components) at a moisture content of 50%, with screw speeds in the range 100 rpm to 300 rpm. Starch/acrylamide weight ratios ranged from 5:1 to 1.3:1. Conversions of acrylamide to PAAm ...
Get PriceJ Polym Environ (2006) 14:125–129 DOI 10.1007/s10924-006-0002-y ORIGINAL PAPER Reactive Extrusion of Starch–Polyacrylamide Graft Copolymers Using Various Starches J. L. Willett Æ V. L. Finkenstadt Published online: 18 March 2006 Springer Science+Business Media, Inc. 2006 Abstract Graft copolymers of polyacrylamide and vari- Introduction ous substrates were prepared by reactive …
Get Price2020-1-1 · The average graft content for all graft-copolymers was 20% (±2%), with CTS-g-copolymer having the highest values, which suggests that cationic modification of starch enhances the grafting reaction in an extruder and offers a method for controlling the properties of graft-copolymers.The grafting efficiency generally reached 75% or more, with SWS being an exception ().
Get PriceA starch-polyacrylamide graft copolymer has been synthesized in water by means of horseradish peroxidase (HRP)/H2O2/acetylacetone (ACAC). It is discussed through single factor experiment that the effects of system pH, reaction temperature and amount of HRP on the residual acrylamide (AAM) content. The results show that the ideal copolymer was synthesized when mass ratio of starch and …
Get PriceAbstract: By means of solution polymerization, a series of cross-linked starch-g-polyacrylamide montmorillonite (St-g-PAM/MMT) nanocomposites were prepared and used to adsorb methylene blue (MB). The effects of different preparation conditions on the adsorption capacity of the nanocomposites were investigated.
Get Pricemethacrylates onto starch have been published (Lipsa et al. 2013; El-Hamshary et al. 2015), less attention has been paid to the grafting of polyacrylamide (PAM) onto CMS and its application as a paper dry-strength agent. In this study, a CMS grafted PAM copolymer (CMS-g-PAM) was synthesized and used as a paper dry-strength agent.
Get Price2017-11-28 · TUGAS AKHIR TK141581 PEMBUATAN FLOKULAN STARCH-g-POLYACRYLAMIDE DENGAN GRAFTING TO Akhmat Fauzi NRP 23121 100 152 Dosen Pembimbing Dr. Ir. Sumarno, M.Eng NIP. 1964 06 08 1991 02 1001 Prida Novarita T., ST., MT
Get PriceFor more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on …
Get PriceA starch-polyacrylamide graft copolymer has been synthesized in water by means of horseradish peroxidase (HRP)/H2O2/acetylacetone (ACAC). It is discussed through single factor experiment that the effects of system pH, reaction temperature and amount of HRP on the residual acrylamide (AAM) content. The results show that the ideal copolymer was synthesized when mass ratio of starch and …
Get PriceCu 0-mediated living radical polymerization (Cu 0-mediated LRP) was employed in this research for the synthesis of starch-g-polyacrylamide (St-g-PAM).The use of a controlled radical grafting technique is necessary, as compared to the traditional free-radical polymerization methods, in order to obtain a well-defined structure of the final product.
Get Price2020-3-24 · production of high-performance starch-based materials. Extrusion processing is one of the most versatile and energy-efficient technologies currently used across various industries for low-cost manufacture of starch-based products such as food, paper, and textiles (Fanta, Felker, & Shogren, 2012; Kalambur & Rizvi, 2006; Wolf, 2010).
Get PriceOSTI.GOV Patent: Sulfomethylated graft copolymers of xanthan gum and polyacrylamide Title: Sulfomethylated graft copolymers of xanthan gum and polyacrylamide Full Record
Get PriceElectrospinning of Fibers from Starch. Electrospinning is a fiber spinning technique that uses a high voltage electrostatic field for the production of fibers with diameters in the range of micrometer to nanometer scale. It has become a widely used fiber formation technique in the last decade [ 14, 38 ].
Get Price2006-5-1 · A plot of m0/m against [S] yielded dissociation constants that were deduced from the intercept of the line of best fit with the x-axis (2Kd), and were calculated to be 0.20 g/L for SBEI, 0.21 g/L for SBEIIa and 1.3 g/L for starch phosphorylase. 4 Discussion Starch biosynthesis in plants is a complex system with many of the enzymes still not ...
Get PriceUS4066495A US05/483,315 US48331574A US4066495A US 4066495 A US4066495 A US 4066495A US 48331574 A US48331574 A US 48331574A US 4066495 A US4066495 A US 4066495A Authority US United States Prior art keywords starch paper weight pulp cationic starch Prior art date 1974-06-26 Legal status (The legal status is an assumption and is not a legal conclusion.
Get Price2003-10-1 · Starch-g-polyacrylamide materials with higher levels of acrylamide were also extruded. The starch feed rate was fixed at 67.5 g/min (dry basis) with a screw speed of 150 rpm. Although the data in Table 2 indicate that higher feed rates could be used, these conditions were selected to reduce the amount of acrylamide handled.
Get PriceFor example, when polyacrylamide is attached to the starch, creating a starch graftpolyacrylamide (SPAM), the amount of water than can be absorbed increases dramatically. The produced SPAMs will have utility in paper production, drilling muds, water treatment or cosmetics. It is known that by changing the reaction conditions, the product of a ...
Get PriceTechnical Abstract: Graft copolymers of starch and polyacrylamide (PAAm) were prepared by reactive extrusion using a co-rotating twin screw extruder and ammonium persulfate initiator. Feed rates were 109 g/min to 325 g/min (all components) at a moisture content of …
Get PriceFTIR spectra of maize starch (MS), acrylamide grafted maize starch (Pam-g-MS), and hydrolyzed polyacrylamide grafted maize starch (HPam-g-MS). In the spectrum of Pam-g-MS the peaks at 3634.01 cm −1 , 3399.45 cm −1 and 3206.08 cm −1 are observed, which can be assigned to the overlap of N H stretching band of amide groups of acrylamide and
Get PriceBiopolymer-based superabsorbent polymers (SAPs) are being synthesized and investigated as a biodegradable alternative for an entirely synthetic SAPs, particularly those based on acrylic acid and its derivatives. This article focuses on the chemical modification of starch (S), and synthesis of new potentially biodegradable polymers using acrylic acid (AA) as side chain monomer and crosslinking ...
Get Price2020-5-12 · Lactic acid production from cooked starch was the most rapid during approximately the first 32 h of culturing, reaching a value of 15.32 ± 0.79 g/L and high lactic acid yield 0.654 g/g at 24 h (Table 2). Afterwards, the process entered stationary phase, probably due to exhaustion of carbon source (starting starch concentration 20 g/L).
Get PricePreparation and swelling properties of a starch-g-poly(acrylic acid)/organo-mordenite hydrogel composite Yan Zhang 1, 3,Pingqiang Gao 3,Lin Zhao 1, 2, * (),Yizhong Chen 2 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China 2. 2.
Get Price2016-10-6 · Based on Figure 1, the starch-based flocculant not only effectively removed turbidity but it also disrupted bacterial cells. The flocculation and sterilization mechanisms can be both attributed to the effective electrostatic interactions between the cationic tertiary amine groups of CMS- g -APAM and the negatively charged surface of the two ...
Get PriceLactic acid production from cooked starch was the most rapid during approximately the first 32 h of culturing, reaching a value of 15.32 ± 0.79 g/L and high lactic acid yield 0.654 g/g at 24 h . Afterwards, the process entered stationary phase, probably due to exhaustion of carbon source (starting starch concentration 20 g/L).
Get PriceFor example, when polyacrylamide is attached to the starch, creating a starch graftpolyacrylamide (SPAM), the amount of water than can be absorbed increases dramatically. The produced SPAMs will have utility in paper production, drilling muds, water treatment or cosmetics. It is known that by changing the reaction conditions, the product of a ...
Get PriceFTIR spectra of maize starch (MS), acrylamide grafted maize starch (Pam-g-MS), and hydrolyzed polyacrylamide grafted maize starch (HPam-g-MS). In the spectrum of Pam-g-MS the peaks at 3634.01 cm −1 , 3399.45 cm −1 and 3206.08 cm −1 are observed, which can be assigned to the overlap of N H stretching band of amide groups of acrylamide and
Get PriceBiopolymer-based superabsorbent polymers (SAPs) are being synthesized and investigated as a biodegradable alternative for an entirely synthetic SAPs, particularly those based on acrylic acid and its derivatives. This article focuses on the chemical modification of starch (S), and synthesis of new potentially biodegradable polymers using acrylic acid (AA) as side chain monomer and crosslinking ...
Get PriceTechnical Abstract: Graft copolymers of starch and polyacrylamide (PAAm) were prepared by reactive extrusion using a co-rotating twin screw extruder and ammonium persulfate initiator. Feed rates were 109 g/min to 325 g/min (all components) at a moisture content of …
Get Price@ A functionalised polyacrylamide grafted starch polymer useful as a paper wet strength additive wherein at least 5 weight percent of the corresponding polyacrylamide grafted starch polymer is polyacrylamide and comprising substituents derived from one or more materials containing two or more aldehyde units, e.g…
Get Price2020-5-12 · Lactic acid production from cooked starch was the most rapid during approximately the first 32 h of culturing, reaching a value of 15.32 ± 0.79 g/L and high lactic acid yield 0.654 g/g at 24 h (Table 2). Afterwards, the process entered stationary phase, probably due to exhaustion of carbon source (starting starch concentration 20 g/L).
Get Price2014-1-21 · 2.1. Microorganism and Production Medium. Indigenous Bacillus licheniformis RTPE-1strain was maintained in NIBGE stock culture collection and 16S rRNA accession number EF644418 submitted at NCBI. The Bacillus licheniformis RTPE1 was maintained on maize starch (1% W/V) plates containing basal salts medium and 2.5% agar. The basal salt medium comprised of (g/L −1) K 2 HPO 4 1.0, (NH …
Get Price2005-12-1 · Protamylasse is a residual compound occurring during the industrial production of starch from potatoes. It contains a variety of nutrients and all necessary minerals and could be used as a carbon, nitrogen, and energy source for the growth of bacteria …
Get Price1992-3-1 · Production and use of enzymes degrading starch and some other polysaccharkles. Food Biotechnol. 4 : 337–351. CAS Article Google Scholar
Get Price2000-8-24 · An improved method, based on sodium dodecyl sulfate‐polyacrylamide gel electrophoresis (SDS‐PAGE) for detection of amylase activity is described. This method will allow better characterization of …
Get PriceStarch/polyacrylamide graft copolymers – the manufacture and fl occulation effi ciency 227 and/or aromatic substituents (Figure 2). These cations determine characteristic features of modifi ed clays [4]. Reactive extrusion is an alternative method to batch slurry processes for starch modifi cation.
Get Price2018-6-15 · Compared to two typical polyacrylamide-based polymers, Magnafloc ® LT22S and Superfloc ® A-100, at an alum dose of 0.95 mg Al/L, activated starch could reach a similarly optimal unit filter run volume (∼116 m 3 /m 2), while the required dose (0.48 mg/L) was approximately 2–10 times higher than those for the other two types of polymers ...
Get PriceStarch is a very popular source material for the production of biodegradable goods and for years was an important subject of ... El-Hamshary, H.; El-Newehy, M.H. Controlled release of phosphorous fertilizer bound to carboxymethyl starch-g-polyacrylamide and maintaining a hydration level for the plant. Int. J. Biol. Macromol. 2018, 116, 224 ...
Get Price2018-8-15 · Starch-binding domain of Aspergillus glucoamylase I was functional when produced in Escherichia coli as a fusion protein with G-galactosidase (Chen et al., 1991a,b). The 13-galactosidase fusion proteins containing different lengths of starch-binding domain adsorbed to granular starch due to the presence of the starch-binding domain.
Get Price2021-4-1 · Starch acetate, a modified starch, was also used for production of fibers . It was produced by grafting starch with acetic acid or acetic anhydride, wherein catalysts such as perchloric acid or sulfuric acid were used. Fibers spun from a non-thermoplastic starch composition (NTPSC) are …
Get Price2007-4-27 · The Lactobacillus amylovorus alpha-amylase starch binding domain (SBD) is a functional domain responsible for binding to insoluble starch. Structurally, this domain is dissimilar from other reported SBDs because it is composed of five identical tandem modules of 91 amino acids each. To understand adsorption phenomena specific to this SBD, the importance of their modular arrangement …
Get Price2002-1-5 · Starch synthase activities are expressed as nmol min –1 g –1 fresh weight of tuber. Starch-branching enzyme activity was measured as the stimulation by tuber extract of the incorporation of glucose from glucose 1-phosphate into glucan via phosphorylase a (μmol min –1 g –1 fresh weight of tuber). Values are means ± SE of measurements ...
Get Price2018-4-4 · Natural (e.g. starch, rubber, DNA, proteins) Synthetic (e.g. nylon, teflon, PVC, polyacrylamide) Semi-synthetic (e.g. vulcanized rubber, chitosan) What are polymers? • Polymers can also be flocculants and coagulants. • A polymer flocculant adsorbs onto suspended particles and forms bridges between them, creating larger aggregates.
Get Price2016-10-18 · Starch is a very abundant and renewable carbohydrate and is an important feedstock for industrial applications. The conventional starch liquefaction and saccharification processes are energy-intensive, complicated, and not environmentally friendly. Raw starch-digesting glucoamylases are capable of directly hydrolyzing raw starch to glucose at low temperatures, which significantly simplifies ...
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