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Synthesis of Ultra High-molecular-weight Polycarbonate by Ritsuko Nagahata; Jun-ichi Sugiyama; Meenakshi Goyal; Michihiko Asai; Mitsuru Ueda; Kazuhiko Takeuchi is a Materials Science article available to read on EtoBox.
What is Synthesis of Ultra High-molecular-weight Polycarbonate about?
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 highmolecular-weight polymers (M w b 1,000,000) were soluble in chloroform.
Who reads Synthesis of Ultra High-molecular-weight Polycarbonate?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Ritsuko Nagahata; Jun-ichi Sugiyama; Meenakshi Goyal; Michihiko Asai; Mitsuru Ueda; Kazuhiko Takeuchi
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1042-7147)
- Published
- 2000
- Language
- EN
- Field
- Materials Science (Physical Sciences)