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Amylose graft polymers made by 60 Co gamma‐irradiation
Author(s) -
Hofreiter B. T.
Publication year - 1977
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1977.070210316
Subject(s) - amylose , acrylamide , polymer , grafting , monomer , aqueous solution , polymer chemistry , starch , intrinsic viscosity , graft polymer , irradiation , materials science , chemistry , polyvinyl alcohol , yield (engineering) , nuclear chemistry , chemical engineering , organic chemistry , physics , nuclear physics , engineering , metallurgy
Model products were needed to elucidate structure–property relationships in a starch graft polymer research program. Simultaneous irradiation of amylose and acrylamide in oxygen‐free, dilute aqueous solutions gave graft polymers with maximum add‐on of about 16%. The graft polymers were separated from homopolymer and subfractionated by incremental additions of nonsolvent (methyl or ethyl alcohol) to irradiated aqueous reaction media. The graft polymers were fairly homogeneous in graft content. Effects were determined of ratios of monomer to substrate, dose rate, and total dose on yield, graft content, intrinsic viscosity, and homopolymer characteristics. Under some conditions, crosslinks probably formed between graft side chains. Large differences in solution properties of a synthetic mixture of separately irradiated amylose and acrylamide and an irradiated solution of amylose and acrylamide indicated that grafting had occurred. Further evidence for true grafting was based on the action of a selective precipitant, n ‐butyl alcohol, on graft polymer solutions.