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Synthesis and characterization of copolyimides with high solubility
Author(s) -
Leu TsuShang,
Wang ChunShan
Publication year - 2003
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.11899
Subject(s) - differential scanning calorimetry , copolymer , glass transition , thermogravimetric analysis , polymer , polymer chemistry , solubility , materials science , monomer , isophorone , diamine , chemistry , organic chemistry , composite material , thermodynamics , physics
Abstract A series of copolyimides were prepared from various diamines (polysiloxane and isophorone units) with aromatic tetracarboxylic dianhydrides via a two‐step (thermal imidization) method. The monomers and polymers were produced in high yields, and the copolyimides containing SiOC bonds and asymmetric meta catenation in the polymer backbone exhibited good solubility. The glass‐transition temperatures ( T g 's) of all the copolyimides were found to be 201–262 and 215–258°C by differential scanning calorimetry (DSC) and dynamic mechanical analysis, respectively. Thermogravimetric analyses indicated that the polymers were fairly stable up to 502–578°C (10 wt % loss in N2) and 490–574°C (10 wt % loss in air). The char yields at 800°C in N2 and air atmospheres were 26–59 and 20–53%, respectively. The copolymerization results, determined with 1H‐NMR and DSC, indicated a random copolymer. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1963–1970, 2003