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Radiation‐induced polyene formation of poly(vinyl chloride). I. Effect of conformations
Author(s) -
Mitani Katsuo,
Ogata Takayuki
Publication year - 1974
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.1974.070181102
Subject(s) - polyene , vinyl chloride , atmospheric temperature range , polymer chemistry , relaxation (psychology) , glass transition , radiation , chemistry , materials science , thermodynamics , composite material , organic chemistry , polymer , optics , physics , psychology , social psychology , copolymer
PVC samples with different syndiotacticities were degraded at temperatures in the range of 10° to 115°C by UV radiation. The average length of polyenes increases with increase in syndiotacticity of PVC. It was found that by comparison with the long tactic sequences, on the basis of Bernoullian statistics, the propagation reaction of the polyenes at room temperature is terminated when there are more than three racemic dyads in the tactic sequences. At room temperature, the deformation of about 1.3 Å of the PVC main chain takes place, and at temperatures above the glass transition temperature the propagation rate of the polyenes is competitive with the relaxation time between the (tt) and the (tg) conformations.