ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Industrial evaluation of allyl starch as a coating material in the late 1940's established that properties such as brittleness, nonhomogeneity of product, solvent solubility, and poor water resistance limited its potentialities to specialty uses. Infrared absorption analysis of allyl dextrin coatings before and after curing established that 50% of the allyl groups oxidatively polymerized. Since some degradation occurs in this process, attempts were made to limit this degradation and to improve coating properties by polymerizing pendant allyl groups with free-radical initiators. Homopolymerization studies involving effets of molecular size and dextrin concentration indicated that intra-molecular polymerization dominated early stages of the reaction. Graft copolymerization of a few unsaturated monomers resulted in products containing 3.6% acrylonitrile, 8.5% acrylic acid, and 15-18% acrylamide. Only with the acrylamide did no concurrent homopolymerization of dextrin allyl groups occur. Neither variations in method for polymerizing the allyl dextrins nor use of copolymers was effective in producing suitably cured coatings.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1963.070070419
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