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Polymers of Carbonic Acid, 31. Cyclic Polycarbonates by Hydrolytic Polycondensation of Bisphenol‐A Bischloroformate
Author(s) -
Kricheldorf Hans R.,
Böhme Sigrid,
Schwarz Gert,
Schultz C.L.
Publication year - 2002
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(20021001)23:14<803::aid-marc803>3.0.co;2-0
Subject(s) - condensation polymer , triethylamine , bisphenol a , polycarbonate , molar mass , polymer , hydrolysis , bisphenol , polymer chemistry , chemistry , catalysis , mass fraction , materials science , nuclear chemistry , organic chemistry , epoxy
The hydrolytic polycondensation of bisphenol‐A bischloroformate in NaOH/CH 2 Cl 2 was studied using triethylamine as the catalyst. Reaction conditions were optimized towards high molar masses. The isolated polycarbonates were characterized by means of SEC and MALDI‐TOF mass spectrometry. The fraction of cyclic polycarbonates strongly increased with higher molecular weights and in the best sample only cycles were detectable (up to 50 000 Da). The largest cycles can compete with cyclic DNS of microorganisms.