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Sequence analysis of fluorine‐containing polyarylethersulfone copolymers by 13 C–NMR
Author(s) -
Wang Zhonggang,
Chen Tianlu,
Xu Jiping
Publication year - 1994
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.1994.070510902
Subject(s) - copolymer , sulfone , carbon 13 nmr , nmr spectra database , sequence (biology) , polymer chemistry , proton nmr , chemistry , materials science , spectral line , stereochemistry , organic chemistry , polymer , physics , biochemistry , astronomy
HexafluorobisA polyethersulfone‐cardo polyethersulfone, random and block copolymers with different segment lengths were synthesized by a reaction of 4,4′‐(hexafluoroisopropylidene) diphenol and 3,3′‐bis(4‐hydroxyphenyl)‐1‐isobenzopyrrolidone with bis (4‐chlorophenyl) sulfone. Their NOE‐suppressed quantitative 13 C–NMR spectra were recorded on a 400 MHz NMR spectrometer. The 13 C–NMR signals of tertiary carbon atom and quaternary carbon atom, on the benzene ring adjacent to sulfone group, appeared to be sensitive to sequence variation. Degrees of randomness of the copolyarylethersulfone synthesized were 0.96, closing to 1, and 0.39, as well as 0.55, far smaller than 1, indicating random distribution and regular distribution of the comonomers, respectively. The number average sequence length, calculated by 13 C–NMR spectra, were shorter than expected, due to the transetherification reaction. © 1994 John Wiley & Sons, Inc.