Graft polymerization of methyl acrylate onto granular starch: Comparison of the Fe2/H2O2 and ceric initiating systems

Trimnell, D.; Fanta, George F.; Salch, John H.

doi:10.1002/(sici)1097-4628(19960418)60:3<285::aid-app1>3.3.co;2-a

Cited by 18 publications

(21 citation statements)

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“…The properties of the resulting copolymers may be widely controlled by the characteristics of side chains, including molecular structure, length and number. Starch graft copolymers could be achieved primarily by free radical initiation processes,1, 3, 5, 8 which include transition ions such as Fe 3+ , V 3+ , Mn 3+ , Ce 3+ , Cu 2+ as well as their complexes 9–11. On the other hand, according to Hebeish et al , poly(methacrylic acid) (MAA)‐starch graft copolymer is the main product of the polymerization reaction only when starch is preswelled prior to grafting 12.…”

Section: Introductionmentioning

confidence: 99%

Modification of carbohydrate polymers via grafting of methacrylonitrile onto pregelled starch using potassium monopersulfate/Fe²⁺ redox pair

Mostafa

Morsy

2004

Polymer International

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The graft copolymerization of reactive pregelled starch (PGS) with methacrylonitrile (MAN) was performed and the reaction conditions were optimized using potassium monopersulfate (PMPS) in the presence of ferrous ion redox pair as initiator. Emphasis was directed towards increasing the graft formation and decreasing homopolymerization. The grafting parameters were studied with respect to graft yield and graft reaction efficiency percent. In addition, the newly prepared polymethacrylonitrile (polyMAN)‐pregelled starch graft copolymers were applied to cotton textiles to see their suitability as a new sizing agent. Based on the results obtained, appropriate conditions for grafting MAN onto pregelled starch was established and the graft yield was higher under the following conditions: using 0.004 mol l−1 potassium monopersulfate as initiator, 0.005 mol l−1 ferrous ion concentration, 0.003 mol l−1, sulfuric acid, 50 % MAN concentration (based on weight of substrate), material to liquor ratio 1:2.5, reaction time 60 min, and polymerization temperature 40 °C. Finally, fabric samples sized with polyMAN‐pregelled starch graft copolymers acquired higher tensile strength and abrasion resistance than that sized with original pregelled starch, while elongation at break was unaltered. Copyright © 2004 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Modification of carbohydrate polymers via grafting of methacrylonitrile onto pregelled starch using potassium monopersulfate/Fe²⁺ redox pair

Mostafa

Morsy

2004

Polymer International

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“…And the homopolymers PMA, PEA, PBM, PMMA, and PBMA were removed in accordance with the method described by Trimnell. [26] The grafting ratio of starch-g-PAA (S-g-PAA) was determined by measuring the carboxyl content of purified S-g-PAA. The content was measured using a titration of carboxyl.…”

Section: Characterization Of the Grafted Starchesmentioning

confidence: 99%

Desizability of the Grafted Starches Used as Warp Sizing agents

Liu

Zhu

et al. 2017

Starch Stärke

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An attempt is made to examine the effect of the consitituent units in the branches grafted onto the backbones of starch on the desizability of grafted starches for warp sizing. The starches investigated include starch‐g‐polyacrylamide, starch‐g‐poly(acrylic acid), starch‐g‐polyacrylate, and starch‐g‐polymethacrylate, which are synthesized via graft copolymerization in water using Fe2+‐H2O2 initiators. The desizability is evaluated by enzyme, alkali, and oxidant desizings in terms of desizing efficiency, water swellability of starch film, and the time for breaking the starch film in water. It is found that the constituent units play an important role in desizability. Hydrophilic units are superior to hydrophobic ones in improving desizability. For the (meth)acrylate units, the increase in the number of carbon atoms in alkyl esters and the presence of α‐methyl show adverse impact on desizability. An increase in the grafting ratio of starch‐g‐polyacrylamide favors improvement of the desizabity whereas the increase in the ratio of starch‐g‐poly(methyl acrylate) reduces the desizabity. Of the three desizing methods considered here, oxidant and enzyme desizings have superior desizability to alkali one.

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“…Larger quantities of graft copolymers were also prepared in a 2 gallon reactor from normal, waxy, and high-amylose corn starch, 11 and tensile properties of extruded specimens were determined. Trimnell et al 12 prepared S-g-PMA from granular corn starch, and polymerizations initiated with CAN and the Fe 12 /H 2 O 2 redox system were compared. Fanta and Shogren 13 prepared S-g-PMA with PMA contents of 12.3, 31.9, 51.7, and 58.3% and then processed these graft copolymers by steam jet cooking at 140 C. Despite the high temperature and intense mechanical shear in the steam jet-cooking process, at most only 13% of the polymer was dissolved, and this soluble fraction was comprised largely of starch.…”

Section: Introductionmentioning

confidence: 99%

Properties of extruded starch–poly(methyl acrylate) graft copolymers prepared from spherulites formed from amylose–oleic acid inclusion complexes

Fanta

Finkenstadt

Felker

2014

J of Applied Polymer Sci

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Mixtures of high‐amylose corn starch and oleic acid were processed by steam jet cooking, and the dispersions were rapidly cooled to yield amylose–oleic acid inclusion complexes as micron‐ and submicron‐sized spherulites and spherulite aggregates. Dispersions of these spherulite particles were then graft polymerized with methyl acrylate, both before and after removal of uncomplexed amylopectin by water washing. For comparison, granular, uncooked high‐amylose corn starch was also graft polymerized in a similar manner. Graft copolymers with similar percentages of grafted and ungrafted poly(methyl acrylate) (PMA) were obtained from these polymerizations. The graft copolymers were then processed by extrusion through a ribbon die, and the tensile properties of the extruded ribbons were determined. Although extruded ribbons with similar tensile strengths were obtained from the three starch–PMA graft copolymers, much higher values for % elongation were obtained from the spherulite‐containing systems. Also, the tensile properties were not significantly affected by removal of soluble, uncomplexed amylopectin by water washing before graft polymerization. These results are consistent with the observation that these PMA‐grafted starch particles did not melt during extrusion, and that continuous plastic ribbons were formed by fusing these particles together in the presence of small amounts of thermoplastic PMA matrix. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40381.

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Graft polymerization of methyl acrylate onto granular starch: Comparison of the Fe2/H2O2 and ceric initiating systems

Cited by 18 publications

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Modification of carbohydrate polymers via grafting of methacrylonitrile onto pregelled starch using potassium monopersulfate/Fe²⁺ redox pair

Modification of carbohydrate polymers via grafting of methacrylonitrile onto pregelled starch using potassium monopersulfate/Fe²⁺ redox pair

Desizability of the Grafted Starches Used as Warp Sizing agents

Properties of extruded starch–poly(methyl acrylate) graft copolymers prepared from spherulites formed from amylose–oleic acid inclusion complexes

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Graft polymerization of methyl acrylate onto granular starch: Comparison of the Fe2/H2O2 and ceric initiating systems

Cited by 18 publications

References 0 publications

Modification of carbohydrate polymers via grafting of methacrylonitrile onto pregelled starch using potassium monopersulfate/Fe2+ redox pair

Modification of carbohydrate polymers via grafting of methacrylonitrile onto pregelled starch using potassium monopersulfate/Fe2+ redox pair

Desizability of the Grafted Starches Used as Warp Sizing agents

Properties of extruded starch–poly(methyl acrylate) graft copolymers prepared from spherulites formed from amylose–oleic acid inclusion complexes

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Modification of carbohydrate polymers via grafting of methacrylonitrile onto pregelled starch using potassium monopersulfate/Fe²⁺ redox pair

Modification of carbohydrate polymers via grafting of methacrylonitrile onto pregelled starch using potassium monopersulfate/Fe²⁺ redox pair