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Synthesis of ultra high‐molecular‐weight polycarbonate
Author(s) -
Nagahata Ritsuko,
Sugiyama Junichi,
Goyal Meenakshi,
Asai Michihiko,
Ueda Mitsuru,
Takeuchi Kazuhiko
Publication year - 2000
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/1099-1581(200008/12)11:8/12<727::aid-pat50>3.0.co;2-j
Subject(s) - polycarbonate , tetramer , trimer , reactivity (psychology) , polymerization , oligomer , polymer chemistry , materials science , polymer , ring opening polymerization , dimer , ring (chemistry) , bisphenol , catalysis , chemistry , organic chemistry , composite material , epoxy , medicine , alternative medicine , pathology , enzyme
Solid‐state thermal polymerization of isolated Bisphenol A type macrocyclic oligocarbonates was carried out. The ring‐opening polymerization progressed without any catalyst. Dimer (c‐2mer) could be completely converted to the corresponding aromatic polycarbonate by heating at 300 ° C for 10 min. In case of trimer (c‐3mer), a small part of c‐3mer remained unpolymerized even after heating for 30 min at 300 ° C and complete conversion of tetramer (c‐4mer) could not be achieved even in 120 min. Although the c‐4mer exhibited much lower reactivity than c‐2mer and c‐3mer, its conversion was drastically improved by the addition of the c‐2mer. The lower reactivity of the larger oligomer may be due to slower initiation of the larger ring. The ultra high‐molecular‐weight polymers ( M w > 1,000,000 ) were soluble in chloroform. Copyright © 2000 John Wiley & Sons, Ltd.