Molecular Motions and Mechanical Relaxations of Poly(Carbonate) in the Glassy State
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概要
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In order to determine the characteristics of the glassy-state relaxations of poly(bisphenol-A carbonate) which are closely overlapping each other, shear relaxation modulus was measured from 10 sec to 900 sec at temperatures ranging from ca. $-180$°C to 0°C. Three relaxations named $\beta$, $\gamma$ and $\delta$ in the order of descending temperature were observed separately and master curves were determined by the method of reduced variables. The activation energies of the $\beta$, $\gamma$ and $\delta$ relaxations were estimated to be ca. 30, 25 and 9 kcal/mol, respectively. Theoretical considerations suggest that the molecular motions for the $\beta$, $\gamma$ and $\delta$ relaxations are the local-mode motion of main chain, the flip motion of a phenylene with a carbonate group, and the rotational motion of a pair of methyl groups belonging to neighboring chains and coupled by van der Waals force.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 1989-03-20
著者
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Kakizaki Maeko
Department Of Applied Physics Faculty Of Engineering Hokkaido University
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Hideshima Teruo
Department Of Applied Physics Faculty Of Engineering Hokkaido University
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Kakizaki Maeko
Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060
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Tanimoto Morimasa
Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060
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