期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 40, 期 23, 页码 4357-4367出版社
JOHN WILEY & SONS INC
DOI: 10.1002/pola.10521
关键词
ethylene carbonate; trimethylene carbonate; glutaric anhydride; polycondensation; backbiting; ring-opening polymerization; MALDI-TOF
Several polycondensations of ethylene carbonate with succinic anhydride or glutaric anhydride (GA) were conducted in bulk. Low molar mass polyesters were obtained with pyridine-type catalysts and GA. Analogous polycondensations of trimethylene carbonate (TMC) and GA were successful when quinoline, 4-(N,N'-dimethylamino)pyridine, or BF3 (.) OEt2 was used as a catalyst. Matrix-assisted laser desorption/ionization time-of-flight mass spectra revealed the formation of cyclic oligoesters and polyesters by backbiting degradation. Monomer mixtures containing an excess of TMC yielded copoly(ester carbonate)s with number-average molecular weights up to 16,000 Da. Analogous copoly(ester carbonate)s were obtained from TMC and 3,3'-tetramethylene glutaric anhydride. Furthermore, combined polycondensation/ring-opening polymerization reactions of TMC and GA with L-lactide or E-caprolactone were studied. All copolymers were characterized by viscosity measurements and by IR, H-1, and C-13 NMR spectroscopy. (C) 2002 Wiley Periodicals, Inc.
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