Comparative TSPC, TSDC and DSC physical ageing studies on PET-a

被引:24
作者
Canadas, JC [1 ]
Diego, JA [1 ]
Mudarra, M [1 ]
Belana, J [1 ]
机构
[1] UPC, ETS Enginyers Ind Terrassa, Dept Fis & Engn, Barcelona 08222, Spain
关键词
poly(ethylene terephthalate); physical ageing; relaxations;
D O I
10.1016/S0032-3861(97)00623-X
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
In the present work a comparative study of physical ageing of poly(ethylene terephthalate) (PET) by thermally stimulated polarization currents (TSPC), thermally stimulated depolarization currents (TSDC) and differential scanning calorimetry (DSC), is presented. In all cases, physical ageing was carried out by annealing the sample at 60 degrees C for several ageing times (from t(a) = 0 to 264 h). Structural relaxation has been studied by DSC through the analysis of the endothermic peak superposed on the glass transition, which increases and shifts towards higher temperatures as the annealing time increases. Measured current spectra of annealed samples show the appearance of a relaxation peak which we named alpha(a). The evolution of this peak with the annealing time is presented, and it has been related directly to the endothermic peak obtained by DSC, and therefore directly associated with the physical ageing of PET. Experiments carried out show the dipolar origin of the alpha(a) peak, related to the polarization of chainswithin the material when mobility is recovered above T-g. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2795 / 2801
页数:7
相关论文
共 16 条
[1]   BEHAVIOR OF AMORPHOUS POLY(ETHYLENE-TEREPHTHALATE) ANNEALED AT T-LESS-THAN-TG BY THERMALLY STIMULATED CURRENTS [J].
BELANA, J ;
MUDARRA, M ;
CANADAS, JC ;
COLOMER, P .
JOURNAL OF MATERIALS SCIENCE, 1993, 28 (14) :3805-3808
[2]  
Belana J., 1984, Journal of Macromolecular Science - Physics, VB23, P467, DOI 10.1080/00222348408219471
[3]   EFFECTS OF ANNEALING AND PRIOR HISTORY ON ENTHALPY RELAXATION IN GLASSY-POLYMERS .1. EXPERIMENTAL-STUDY ON POLYVINYL-CHLORIDE) [J].
BERENS, AR ;
HODGE, IM .
MACROMOLECULES, 1982, 15 (03) :756-761
[4]   SUB-SUB-TG STRUCTURAL RELAXATION IN GLASSY-POLYMERS [J].
CHEN, HS ;
WANG, TT .
JOURNAL OF APPLIED PHYSICS, 1981, 52 (10) :5898-5902
[5]  
FLEMING RJ, 1988, P 6 INT S EL OXF UK, P118
[6]   QUANTITATIVE STUDY OF ANNEALING OF POLY(VINYL CHLORIDE) NEAR GLASS TRANSITION [J].
FOLTZ, CR ;
MCKINNEY, PV .
JOURNAL OF APPLIED POLYMER SCIENCE, 1969, 13 (10) :2235-&
[7]  
HILCZER B, 1986, STUDIES ELECT ELECT, V14
[8]   SIMPLE PHENOMENOLOGICAL APPROACH TO THERMAL-BEHAVIOR OF GLASSES DURING UNIFORM HEATING OR COOLING [J].
HUTCHINSON, JM ;
KOVACS, AJ .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1976, 14 (09) :1575-1590
[9]  
KOVACS A. J., 1963, Fortschr. Hochpolym.- Forsch., V3, P394, DOI DOI 10.1007/BFB0050366
[10]   ISOBARIC VOLUME AND ENTHALPY RECOVERY OF GLASSES .2. TRANSPARENT MULTI-PARAMETER THEORY [J].
KOVACS, AJ ;
AKLONIS, JJ ;
HUTCHINSON, JM ;
RAMOS, AR .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1979, 17 (07) :1097-1162