Cold crystallization effects in free charge relaxation in PET and PEN

被引：18

作者：

Cañadas, JC ^{[1
]}

Diego, JA ^{[1
]}

Sellarès, J ^{[1
]}

Mudarra, M ^{[1
]}

Belana, J ^{[1
]}

机构：

[1] Univ Politecn Catalunya, Dept Fis & Enginyeria Nucl, ETSEIT, Barcelona 08222, Spain

来源：

POLYMER | 2000年 / 41卷 / 23期

关键词：

crystallinity; thermostimulated depolarization current windowing polarization;

D O I：

10.1016/S0032-3861(00)00192-0

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A comparative study of free charge relaxation in amorphous and partially crystallized poly(ethylene-2,6-naphthalene dicarboxylate) (PEN) and poly(ethylene terephthalate) (PET) has been carried out by thermally stimulated depolarization currents (TSDC), differential scanning calorimetry (DSC), and X-ray diffraction. Amorphous films have been crystallized thermally at temperatures between 170 and 200 degrees C (PEN); 100 and 150 degrees C (PET) by the thermal stimulation by steps method. The windowing polarization (WP) technique has been applied to form PET and PEN thermoelectrets. TSDC of these electrets polarized at 86 degrees C (PET) and 130 degrees C (PEN) show only one peak which is attributed to space charge relaxation (p peak). The evolution of this peak has been fitted to the general kinetic order model. DSC measurements of these samples show the appearance of a small endothermic prefusion peak once the crystallization of the sample is completed. This peak increases and shifts towards higher temperatures as the sample is further thermally treated. Associated with the appearance of this endothermic peak, the p relaxation passes through a maximum with a sharp decrease with further heat temperature. The X-ray diffraction measurements of these samples show that the decrease in the p peak is associated with the improvement of the amorphous-crystal interphases. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：8393 / 8400

页数：8

共 23 条

[1] TSC STUDY OF THE POLAR AND FREE CHARGE PEAKS OF AMORPHOUS POLYMERS [J].

BELANA, J ;

MUDARRA, M ;

CALAF, J ;

CANADAS, JC ;

MENENDEZ, E .

IEEE TRANSACTIONS ON ELECTRICAL INSULATION, 1993, 28 (02) :287-293

[2] COLD CRYSTALLIZATION EFFECT ON ALPHA-AMORPHOUS AND RHO-AMORPHOUS POLY(ETHYLENE-TEREPHTHALATE) RELAXATIONS BY THERMALLY STIMULATED DISCHARGE CURRENTS [J].

BELANA, J ;

PUJAL, M ;

COLOMER, P ;

MONTSERRAT, S .

POLYMER, 1988, 29 (10) :1738-1744

[3] Relaxational study of poly(ethylene-2,6-naphthalene dicarboxylate) by tsdc, dea and dma [J].

Canadas, JC ;

Diego, JA ;

Mudarra, M ;

Belana, J ;

Diaz-Calleja, R ;

Sanchis, MJ ;

Jaimes, C .

POLYMER, 1999, 40 (05) :1181-1190

[4] Comparative study of amorphous and partially crystalline poly(ethylene-2,6-naphthalene dicarboxylate) by TSDC, DEA, DMA and DSC [J].

Cañadas, JC ;

Diego, JA ;

Sellarès, J ;

Mudarra, M ;

Belana, J ;

Díaz-Calleja, R ;

Sanchis, MJ .

POLYMER, 2000, 41 (08) :2899-2905

[5]

CANADAS JC, 1999, THESIS U POLITECNICA, P144

[6]

CHEN R, 1981, ANAL THERMALLY STIMU, P34

[7] Relaxations in semicrystalline polyethyleneterephthalate using thermally stimulated currents [J].

Colomer, P ;

Montserrat, S ;

Belana, J .

JOURNAL OF MATERIALS SCIENCE, 1998, 33 (07) :1921-1926

[8] STUDY OF THE ALPHA-RELAXATIONS AND BETA-RELAXATIONS ON A COMMERCIAL POLYVINYL-CHLORIDE) BY THERMALLY STIMULATED CREEP AND DEPOLARIZATION CURRENT TECHNIQUES [J].

DELVAL, JJ ;

ALEGRIA, A ;

COLMENERO, J ;

LACABANNE, C .

JOURNAL OF APPLIED PHYSICS, 1986, 59 (11) :3829-3834

[9] Glass transition studies in physically aged partially crystalline poly(ethylene terephthalate) by TSC [J].

Diego, JA ;

Cañadas, JC ;

Mudarra, M ;

Belana, J .

POLYMER, 1999, 40 (19) :5355-5363

[10] THE ELECTRON TRAP MECHANISM OF LUMINESCENCE IN SULPHIDE AND SILICATE PHOSPHORS [J].

GARLICK, GFJ ;

GIBSON, AF .

PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON, 1948, 60 (342) :574-590

← 1 2 3 →