THERMALLY STIMULATED CURRENT STUDY OF RELAXATION IN GLASSY POLYCARBONATE

被引：20

作者：

BERNES, A ^{[1
]}

CHATAIN, D ^{[1
]}

LACABANNE, C ^{[1
]}

机构：

[1] UNIV TOULOUSE 3,PHYS SOLIDES LAB,CNRS,URA 74,118 ROUTE NARBONNE,F-31062 TOULOUSE,FRANCE

来源：

POLYMER | 1992年 / 33卷 / 22期

关键词：

THERMALLY STIMULATED CURRENTS; POLYCARBONATE; VITREOUS STATE; ANNEALING; POLARIZATION;

D O I：

10.1016/0032-3861(92)90676-N

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 transitions/relaxations of polycarbonate around its glass transition temperature, T(g), have been investigated by differential scanning calorimetry and thermally stimulated current spectroscopy. A sub-glass transition/relaxation has been observed with higher intensity iii the quenched sample. This precursor of T(g) is characterized by relaxation times following a Fulcher-Vogel equation. It might be explained by the diffusion of conformational defects all along the chain. The glass transition/relaxation is constituted of two components: (i) The lower-temperature component is associated with a distribution of relaxation times obeying a compensation law. It corresponds to cooperative movements of sequences of various length in the 'true' amorphous regions. (ii) The upper-temperature component is enhanced by annealing above T(g). It has been attributed to the 'constrained' amorphous regions. Note that such domains with high local order have been previously observed by electron microscopy and X-ray diffraction.

引用

页码：4682 / 4686

页数：5

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