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The chemically initiated solid‐state polymerization of hexamethylcyclotrisiloxane
Author(s) -
Chawla A. S.,
St.Pierre L. E.
Publication year - 1975
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.1975.070190203
Subject(s) - polymerization , polymer , polymer chemistry , activation energy , materials science , bulk polymerization , solid state , photochemistry , chain growth polymerization , chemistry , radical polymerization , organic chemistry
The HBr‐initiated solid‐state polymerization of hexamethylcyclotrisiloxane has been investigated. Up to about 70% conversion, the rate of polymerization is found to be constant but the molecular weight of the polymer formed was observed to increase with conversion. Temperature did not have a marked effect on the polymerization rate as an activation energy of only 2.8 kcal/mole was observed, whereas the rate was found to be exponentially related to the HBr vapor pressure. The HBr and the radiation‐initiated solid‐state polymerization are compared.