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A study on the effect of spirocyclic structures in the main chain on the physical properties of copolyimides
Author(s) -
Li Jun,
Kudo Kazuaki,
Shiraishi Shinsaku
Publication year - 2000
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20001101)21:16<1166::aid-marc1166>3.0.co;2-m
Subject(s) - alicyclic compound , glass transition , solubility , tetrahydrofuran , polymer chemistry , materials science , octane , chemistry , organic chemistry , polymer , composite material , solvent
A series of copolyimides were prepared from two alicyclic dianhydrides having the common molecular formula C 10 H 8 O 6 , rel ‐[1 S ,5 R ,6 R ]‐3‐oxabicyclo[3.2.1]octane‐2,4‐dione‐6‐spiro‐3′‐(tetrahydrofuran‐2′,5′‐dione) (DAn) and c ‐3‐carboxymethyl‐ r ‐1, c ‐2, c ‐4‐cyclopentanetricarboxylic acid 1,4:2,3‐dianhydride (TCAAH), with p ‐phenylenediamine (PPD) by a conventional two‐step procedure. With increasing DAn fractions in the backbones, the copolyimides showed better film formability, enhanced solubility, increased glass transition temperatures and birefringences, and decreased average refractive indices. The unsymmetric spiroalicyclic structure of DAn might be responsible for these results. Films of copolyimides obtained by both thermal and chemical imidization were fully transparent and were colorless or pale yellow depending on the film thickness.