Synthesis and Applications of Reactive Carbohydrates Part II: Graft Polymerization of Starch and Hydrolyzed Starches with Acrylamide

Higazy, A.; Bayazeed, A.; Hebeish, A.

doi:10.1002/star.19870390907

Cited by 15 publications

(2 citation statements)

References 5 publications

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“…Hydrolyzed corn starch having 0.84 m. eq. /100 gm sample was prepared according to the method mentioned elsewhere [49].…”

Section: Acid Hydrolysis Of Native Starchmentioning

confidence: 99%

02. Fading Characteristics of Chemically Modified Cotton Fabric Dyed with an Acid Dye

Tera,

Samaha,

Hafez

et al. 2024

Journal of Measurement Science and Applications (JMSA)

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“…Hydrolyzed corn starch having 0.84 m. eq. /100 gm sample was prepared according to the method mentioned elsewhere [49].…”

Section: Acid Hydrolysis Of Native Starchmentioning

confidence: 99%

02. Fading Characteristics of Chemically Modified Cotton Fabric Dyed with an Acid Dye

Tera,

Samaha,

Hafez

et al. 2024

Journal of Measurement Science and Applications (JMSA)

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“…The U.S. Department of Agriculture showed that starch‐ graft ‐polyacrylonitrile (Sr‐ g ‐pAN) hydrolyzate exhibits super absorbing properties 4. Since then, the graft copolymerization of Sr has been studied by many workers 5–31…”

Section: Introductionmentioning

confidence: 99%

Synthesis of starch‐graft‐polyacrylonitrile hydrolyzate and its characterization

Sugahara

Ohta

2001

J of Applied Polymer Sci

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ABSTRACT:The graft copolymerization of three vinyl monomer species, acrylonitrile (AN), acrylamide (AAm), and acrylic acid (AA), onto starch was carried out with ceric salt (Ce salt) as an initiator. With 3 mmol/L Ce salt, the monomer activity onto starch decreased in the following order: AN Ͼ AAm Ͼ AA. Grafting efficiency with AN as the grafting monomer was greater than 90%, but with AA and AAm, it was less than 50%. Starch-graft-polyacrylonitrile was hydrolyzed to introduce amide and carboxyl groups into starch. The hydrolyzates were analyzed with infrared spectroscopy. The hydrolysis reaction was accelerated with increasing alkali concentration, reaction temperature, and time. The water absorbancy of the hydrolyzate increased with an increasing carboxyl molar fraction in the polymer, and it dissolved in water above a 0.6 molar fraction. The absorbancy of water was 2 times higher than that of a NaCl aqueous solution. The copper-ion-exchange capacity of the sample was greater in graft copolymers with higher carboxyl group contents.

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Chemical Factors Affecting Preparation of Carboxymethyl Starch

Hebeish

Khalil

1988

Starch Stärke

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Preparation of carboxymethyl starch using chloroacetic acid and sodium hydroxide was investigated under different conditions. The carboxymethylation reaction was studied with respect to the degree of substitution (D. S.) of the carboxymethyl starch and the reaction efficiency (R. E.) of carboxymethylation variables studied included concentration of reactants and liquor ratio as well as reaction time and temperature. D. S. and R. E. were greatly enhanced by decreasing the liquor ratio. D. S. and R. E. increased also by increasing the reaction time. On the other hand, increasing the monochloroacetic acid concentration was accompanied by enhancement in the D. S. and decrement in the R. E., while both the D. S. and R. E. exhibited maximum values at 4N sodium hydroxide. The combined effect of increasing both monochloroacetic acid and sodium hydroxide concentrations was to bring about increased D. S. and decreased R. E. irrespective of the reaction temperature. Of particular interest were the results obtained at 100°C for 1 h; carboxymethyl starch of D. S. 0.436 with R. E. of ca. 79% could be achieved using solid reactants/liquor ratio of 1: 1.

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Synthesis and Applications of Reactive Carbohydrates Part II: Graft Polymerization of Starch and Hydrolyzed Starches with Acrylamide

Abstract: starch/garke 39 (1987) Nr. 9, S. 319-322 0 VCH Verlagagesell\chafr mhH, D-694(1 Weinheim.

Cited by 15 publications

References 5 publications

02. Fading Characteristics of Chemically Modified Cotton Fabric Dyed with an Acid Dye

02. Fading Characteristics of Chemically Modified Cotton Fabric Dyed with an Acid Dye

Synthesis of starch‐graft‐polyacrylonitrile hydrolyzate and its characterization

Chemical Factors Affecting Preparation of Carboxymethyl Starch

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