Effect of cooling rate on enthalpy and volume relaxation of polystyrene

被引：30
作者：
Hadac, J.
Slobodian, P.
Riha, P.
Saha, P.
Rychwalski, R. W.
Emri, I.
Kubat, J.
机构：
[1] Tomas Bata Univ Zlin, Ctr Polymer, Zlin 76272, Czech Republic
[2] Acad Sci Czech Republic, Inst Hydrodynam, Prague 16612, Czech Republic
[3] Chalmers, Dept Mat & Mfg Technol, SE-41296 Gothenburg, Sweden
[4] Univ Ljubljana, Ctr Expt Mech, Ljubljana 1000, Slovenia
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2007年 / 353卷 / 28期
关键词：
glass transition; polymers and organics; calorimetry; enthalpy relaxation; thermodynamics; stress relaxation; structural relaxation; volume relaxation;
D O I：
10.1016/j.jnoncrysol.2007.05.017
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This paper presents the results of measurements of physical aging on polystyrene with a narrow molecular weight distribution (M-w/M-n = 1.03). The evolution of the aging process was followed by recording the relaxed enthalpy and the accompanying decrease in volume, using differential scanning calorimetry and mercury-in-glass dilatometry, respectively. The measurements were carried out after cooling the sample at constant rate to the aging temperature. The cooling rate varied between 0.0037 and I degrees C/min. The aging data were fitted with the KWW and the TNM functions. The differences in the time scales of enthalpy, h, and volume, v, relaxation were relatively small. From the h(v) graphs the derivative dh/d upsilon was found to amount to about 1.8 GPa, a value significantly exceeding the predictions of the thermodynamic model containing an additional internal variable. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：2681 / 2691
页数：11
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