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Kinetics of thermal polymerization of shellac. Part I. Kinetics and gelation studies
Author(s) -
Kumar A.
Publication year - 1964
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.1964.070080312
Subject(s) - shellac , kinetics , polymerization , gel point , polymer chemistry , curing (chemistry) , viscosity , thermal , materials science , intrinsic viscosity , chemical engineering , chemistry , thermodynamics , composite material , polymer , physics , quantum mechanics , engineering , coating
In the present investigation the kinetics of thermal polymerization of shellac has been studied. A linear relationship between the intrinsic viscosity [η] and the time of polymerization has been observed up to a certain extent of reaction followed by a sharp rise in value of [η] near the gel point. After gelation the intrinsic viscosity of the sol fraction again falls abruptly. Besides, an attempt has also been made to understand the nature of gelation from the weight fractions of gel formed after prolonged curing at different temperatures.