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Controlled polymerization in unsaturated polyesters. II. B‐staging
Author(s) -
Harold Jr. P. Parker
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.1964.070080333
Subject(s) - polymerization , benzoyl peroxide , polyester , polymer chemistry , radical polymerization , chemistry , cationic polymerization , yield (engineering) , alkyl , chain transfer , peroxide , kinetic chain length , radical initiator , materials science , organic chemistry , polymer , metallurgy
Addition of substituted quinones to unsaturated polyesters in a stoichiometric ration with a low temperature initiator gives rapid polymerization to a stable, partially polymerized or B‐staged unsaturated polyester. A stable, high temperature peroxide can be incorporated which is unaffected by the first‐stage polymerization but which will initiate polymerization to the C‐stage when the sample is heated. This process appears possible because of a low rate of reaction of substituted quinones with growing free radical chains in polymerization. In general, the rate of reaction of the quinone seems to decrease with size and number of substituents. Alkyl‐substituted quinones yield a stable product upon reaction with growing radical chain, whereas chloroquinone does not.