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Dynamic‐mechanical study of the secondary transition of poly(vinyl chloride)
Author(s) -
Pezzin G.,
Ajroldi G.,
Garbuglio C.
Publication year - 1967
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.1967.070111215
Subject(s) - crystallinity , vinyl chloride , copolymer , polymer chemistry , materials science , plasticizer , glass transition , composite material , polymer
The influence of crystallinity, thermal history, plasticization, copolymerization, and chemical modifications on the dynamic‐mechanical properties of poly(vinyl chloride) has been studied by means of a free‐oscillation torsional pendulum. It was found that the secondary dispersion maximum is not affected by free volume, crystallinity, or head‐to‐head microstructure, but is modified by post‐chlorination, copolymerization, and plasticization. These results show that the molecular motions responsible for the PVC β peak are not influenced by local differences in the distribution of the Cl atoms along the chain, so that they seem to be largely of a cooperative type.