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Solid‐state characterization and the thermal properties of stereoregular poly(vinyl chloride) prepared by urea clathrate polymerization
Author(s) -
Minagawa Masatomo,
Narisawa Ikuo,
Sugisawa Hisashi,
Hasegawa Shin,
Yoshii Fumio
Publication year - 1999
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/(sici)1097-4628(19991213)74:12<2820::aid-app5>3.0.co;2-2
Subject(s) - vinyl chloride , clathrate hydrate , polymer chemistry , polymerization , thermal stability , materials science , glass transition , polymer , hildebrand solubility parameter , polyvinyl chloride , thermal analysis , chemical engineering , chemistry , thermal , hydrate , organic chemistry , thermodynamics , composite material , copolymer , physics , engineering
The solid‐state characterization of highly stereoregular poly(vinyl chloride) (PVC) prepared by urea clathrate polymerization was carried out by using various instrumental analyses. The structural differences of PVC appeared most remarkably in solubility to organic solvents, IR, WAXD, and solid‐state 13 C‐NMR spectra. The value of the glass transition temperature ( T g ) was about 90°C, not as high as expected, although its detection was quite difficult. The thermal stability was poor, as evidenced by the easy discoloration of this polymer by heat treatment, which was related to the absence of a termination reaction. Dynamic ESR spectra in the solid state clearly indicate that the radical formation occurs at such a low temperature as 160°C in the initial degradation stage. The degradation characteristics of urea clathrate PVC were critically discussed. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 2820–2825, 1999