Synthesis and biological study of some amino acid functionalized starch-graft-polyacrylamide

El‐Hamshary, Hany; Al-Sigeny, Samia; Ali, Magda M.

doi:10.1016/j.carbpol.2005.11.036

Cited by 19 publications

(10 citation statements)

References 20 publications

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“…Among the chemical methods, graft copolymerization of vinyl monomers appears to be highly attractive, because it constitutes a powerful means of improving the starch properties and broadening the starch uses [1]. Up to date numerous studies have been published regarding the grafting of monomers such as methyl acrylate [2], acrylamide [3], acrylonitrile [4], 3-caprolactone [5], styrene [6], vinyl acetate [7] by using radiation [8,9], redox systems such as ceric ammonium nitrate [2], potassium permanganate [5,10], H 2 O 2 /Fe 21 [11] and many other initiation systems generating free radicals on the surface of the starch granules and copolymerization of these free radicals with the vinyl monomers.…”

Section: Introductionmentioning

confidence: 99%

A Novel Copolymer: Starch‐g‐Polyvinylpyrrolidone

et al. 2009

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In this study, graft copolymerization of N-vinylpyrrolidone (N-VP) onto starch was carried out in an aqueous medium using azobisisobutyronitrile (AIBN) as initiator. The variables affecting the graft copolymerization, such as monomer and initiator concentrations, reaction time and temperature, were thoroughly examined. In general, grafting of N-vinylpyrrolidone onto starch increased with the increase in time and monomer concentration up to a certain value and then leveled off. Similarly, increase both in initiator concentration and temperature first favored and than impeded the grafting reaction. Optimum conditions established for grafting were as follows: N-VP = 0.7 M, AIBN = 1.5610 -3 M, T = 707C and t = 5 h. Structural changes of the grafted starch were followed by FTIR, intrinsic viscosity and water absorption capacity studies.

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Section: Introductionmentioning

confidence: 99%

A Novel Copolymer: Starch‐g‐Polyvinylpyrrolidone

et al. 2009

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“…During copolymerization, the formed grafted branches bind with starch backbone only via oxygen because graft copolymerization is initiated by expelling active hydrogen atom from starch hydroxyl (Hamshary et al 2006), Figure 1. Table 2 shows some efficiency parameters of hydrolysis and monomer grafting on starch.…”

Section: Resultsmentioning

confidence: 98%

“…On the other hand, cyclic structure and many hydroxyl groups make starch material brittle and rigid. Therefore, starch films are not flexible and adhesion to surfaces is never good enough (Hamshary et al 2006;Shogren et al 2009;Singha et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Cotton Yarn Sizing by Acrylamide Grafted Starch Copolymer

Djordjević

Kovačević

Nikolić

et al. 2014

Journal of Natural Fibers

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Synthesis and characterization of copolymer obtained by grafting acrylamide onto hydrolyzed potato starch and its application in cotton yarn sizing were presented in this work. Some process parameters of starch hydrolysis and grafting, like as hydrolysis yield, grafting yield, grafting percentage, graft efficiency, and monomer to polymer conversion were determinated. Molar mass values of hydrolyzed starch and copolymer samples are located in a narrow range of 1 × 10 5 to 1 × 10 7 and 1 × 10 2 to 1 × 10 4 . Grafted hydrolyzed starch, as a sizing agent, gives better results than nongrafted, particularly in terms of sizing uniformity, yarn mechanical parameters, and easier removal in subsequent desizing process.

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“…During copolymerization with initiators AIBN, BP and PP, the formed grafted branches bind to the starch backbone only via oxygen because graft copolymerization is initiated by expelling the active hydrogen atom from the starch hydroxyl group ( Figure 1) [1]. Acrylamide was then grafted on shorter starch molecules forming side branches on the main chain, resulting in a product that could be used more successfully in textile processing.…”

Section: Resultsmentioning

confidence: 99%

Effect of various initiators on molar mass determination of hydrolyzed potato starch-acrylamide graft copolymers

Djordjević¹,

Nikolić²,

Kovačević

et al. 2013

CI&CEQ

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This study investigates the synthesis, characterization and properties of graft copolymer produced from hydrolyzed potato starch and acrylamide using various initiators (azobisisobutyronitrile, potassium persulfate and benzoyl peroxide). Starch hydrolysis was performed in order to reduce molecular mass. Acrylamide was grafted on shorter starch macromolecules creating side branches on the main chain resulting in a product that could be used in textile finishing more successfully. Various initiators were used, primarily to produce graft monomer on the starch, and also to obtain thinner or thicker packaging of side chains that can influence the behavior of textile yarns impregnated with these copolymers. Benzoyl peroxide proved to be very successful as an initiator in grafting of acrylamide on hydrolyzed starch, in terms of yield, graft percentage and efficiency results. Grafting in the presence of azobisisobutyronitrile and potassium persulfate as initiators had slightly better monomer to polymer conversion values. FTIR spectra of hydrolyzed and grafted starch confirmed that grafting was successful. Residual amounts of monomer in copolymer and molar mass distribution were determined by chromatography. The results show that the highest quantity of monomer is found in the sample of hydrolyzed starch grafted in the presence of potassium persulfate. Molar masses of hydrolysate and copolymer show differences ranging from 110 2 to 210 7 g/mol. The results of sizing using grafted starch show that sized yarns had higher strength (tenacity) and lower elongation. Grafted hydrolyzed starch, as an agent for cotton yarn sizing, gave better results than non-grafted starch, especially regarding sizing uniformity, yarn mechanical parameters and easier removal in the following desizing process.

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Synthesis and biological study of some amino acid functionalized starch-graft-polyacrylamide

Cited by 19 publications

References 20 publications

A Novel Copolymer: Starch‐g‐Polyvinylpyrrolidone

A Novel Copolymer: Starch‐g‐Polyvinylpyrrolidone

Cotton Yarn Sizing by Acrylamide Grafted Starch Copolymer

Effect of various initiators on molar mass determination of hydrolyzed potato starch-acrylamide graft copolymers

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