DEPENDENCE OF THE SPECIFIC-HEAT IN GLASSY POLYBUTADIENE ON THERMAL HISTORY

被引：7

作者：

BAHR, M ^{[1
]}

SCHREIER, F ^{[1
]}

WOSNITZA, J ^{[1
]}

LOHNEYSEN, HV ^{[1
]}

ZHU, C ^{[1
]}

QIN, XK ^{[1
]}

CHEN, H ^{[1
]}

LIU, X ^{[1
]}

WU, X ^{[1
]}

机构：

[1] TONGJI UNIV,POHL INST SOLID STATE PHYS,SHANGHAI 200092,PEOPLES R CHINA

来源：

EUROPHYSICS LETTERS | 1993年 / 22卷 / 06期

关键词：

D O I：

10.1209/0295-5075/22/6/008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The specific heat of glass-forming polybutadiene in the glass transition region depends strongly on the thermal history of the sample. After cooling and waiting at a temperature T(w) < T(g) (T(g) almost-equal-to 178 K is the glass transition temperature) for a (constant) time t(w), the peak value of the specific-heat anomaly at T(g) passes over a maximum as a function of T(w) at T(w) almost-equal-to 169 K. The energy taken up by the sample when heating through T(g) after waiting at T(w) = 169 K increases with t(w) and can be described by a Kohlrausch law DELTAQ(t(w)) approximately {1 - exp[-(t(w)/tau)beta]} with beta almost-equal-to 0.5 and tau = = 100 min. Comparison with recent neutron-scattering data indicates that the different time scales of microscopic and macroscopic relaxations may be attributed to their different length scales.

引用

页码：443 / 448

页数：6

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