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Preparation of crystalline and solvent resistant polycarbonates via ring‐opening polymerization of cyclic oligomers
Author(s) -
Brunelle Daniel J.,
Krabbenhoft Herman O.,
Bonauto David K.
Publication year - 1994
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19940770115
Subject(s) - hydroquinone , polymer chemistry , solvent , tetrahydrofuran , polymerization , bisphenol , copolymer , polymer , melting point , glass transition , bisphenol a , hydrolysis , materials science , chemistry , organic chemistry , epoxy
A route to solvent‐resistant polycarbonates which may also be crystalline has been achieved through the intermediacy of cyclic oligomeric carbonates. Mixed oligomeric cyclics of a variety of bisphenols were prepared via the carefully controlled hydrolysis‐condensation of their bischloroformates. Following ring‐opening polymerization, the polymers were evaluated for potential solvent resistance. Copolymers of hydroquinone and bisphenol A containing ratios of hydroquinone to BPA between 50/50 and 70/30 were found to be insoluble in CH 2 Cl 2 , tetrahydrofuran, and CHCl 3 , as well as other organic solvents. Polymers containing ratios of hydroquinone/BPA greater than 60/40 show a crystalline melting point by DSC at about 310°C and a glass transition temperature at 154°C.