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Molecular aggregation in poly(vinyl chloride)
Author(s) -
Salovey R.,
Gebauer R. C.
Publication year - 1973
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.1973.070170918
Subject(s) - crystallinity , vinyl chloride , molecule , polymerization , polymer chemistry , annealing (glass) , methanol , fraction (chemistry) , gel permeation chromatography , polyvinyl chloride , precipitation , materials science , chemistry , polymer , chemical engineering , organic chemistry , copolymer , crystallography , composite material , physics , meteorology , engineering
PVC synthesized in a bulk polymerization at −25°C was fractionated by preparative GPC. The eluent THF solutions consist largely of dissociated molecules. Following precipitation into methanol, recovered PVC fractions contain aggregated molecules and are partially insoluble in THF. The soluble portions produce distorted chromatograms characteristic of molecular aggregation. The aggregate fraction increases with molecular weight. Heating recovered PVC fractions at 90°C in THF was adequate to dissociate the aggregates. Following recovery, fractions of PVC do not show crystalline x‐ray diffraction patterns. The PVC fractions were crystallizable by subsequent annealing at 150°C to approximately 15% crystallinity, largely independent of molecular weight.