ON THE MECHANICAL GAMMA-RELAXATION MODES OF POLYCARBONATE

被引：14

作者：

HORTH, FJ

KUHN, KJ

MERTES, J

HELLMANN, GP

机构：

[1] DEUTSCH KUNSTSTOFF INST DARMSTADT,W-6100 DARMSTADT,GERMANY

[2] UNIV MAINZ,INST PHYS CHEM,W-6500 MAINZ,GERMANY

来源：

POLYMER | 1992年 / 33卷 / 06期

关键词：

POLYCARBONATE; SECONDARY RELAXATIONS; DYNAMIC MECHANICAL SPECTROSCOPY;

D O I：

10.1016/0032-3861(92)90767-Q

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The secondary (gamma) relaxation modes of the polycarbonate of bisphenol A (PC) in the glassy state are discussed. Dynamic mechanical spectra of PC, its mixtures with plasticizers and oligomers, its blends with tetramethyl polycarbonate, as well as spectra of modified polycarbonates and of PC under stress are shown. The evidence suggests that the motions active in glassy PC are intramolecularly cooperative torsional 'local-mode' motions of backbone segments with about 5-7 monomer units. Cooperativity can be reduced or enhanced; it is controlled by the tightness of the matrix. Intermolecularly the motions are not cooperative.

引用

页码：1223 / 1227

页数：5