MOLECULAR DESCRIPTION OF CONSTANT-LOAD STRETCHING OF AMORPHOUS POLY(ETHYLENE-TEREPHTHALATE) FILMS

被引:16
作者
LORENTZ, G
TASSIN, JF
机构
[1] UNIV MAINE,PHYSICOCHIM MACROMOLEC LAB,CNRS,URA 509,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE
[2] RHONE POULENC FILMS,MAGPHANE INT,F-01701 MIRABEL,FRANCE
关键词
PET FILMS; ORIENTATION; RELAXATION;
D O I
10.1016/0032-3861(94)90122-8
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
This paper is devoted to a molecular description of the deformation of amorphous isotropic poly(ethylene terephthalate) (PET) films at temperatures slightly above the glass transition temperature under constant load. The deformation is qualitatively described by chain relaxation phenomena occurring before stress-induced crystallization, which are followed by the equilibration of a rubber-like network. The junction points include both trapped entanglements and crystalline units. The structure of this network is characterized by the number of segments between crosslinks. This parameter is calculated by comparing the predictions of the rubber elasticity theory (without Gaussian approximation) with the experimentally observed draw ratios under given conditions of temperatures and loads. It is shown that light loads induce soft networks leading to high draw ratios. The predictions of the molecular orientation derived from this treatment are in good agreement with birefringence data on a large variety of samples.
引用
收藏
页码:3200 / 3205
页数:6
相关论文
共 19 条
[1]  
DAUBENY RD, 1954, PROC R SOC LON SER-A, V226, P531
[2]  
Doi M., 1986, THEORY POLYM DYNAMIC
[3]  
Flory P.J., 1989, STAT MECH CHAIN MOL
[4]  
GUPTA VB, 1987, POLYM COMMUN, V28, P43
[5]   DEVELOPMENT OF THE AXIAL YOUNG MODULUS WITH DRAW RATIO OF FLEXIBLE-CHAIN POLYMERS [J].
IRVINE, PA ;
SMITH, P .
MACROMOLECULES, 1986, 19 (01) :240-242
[6]   UNIAXIAL PLANAR DEFORMATION OF PET FILMS .2. CHARACTERIZATION OF THE ORIENTATION FROM MEASUREMENTS OF REFRACTIVE-INDEXES [J].
LAPERSONNE, P ;
TASSIN, JF ;
MONNERIE, L .
POLYMER, 1994, 35 (10) :2192-2196
[7]   MOLECULAR-ORIENTATION AND CONFORMATIONAL-CHANGES DUE TO UNIAXIAL-PLANAR DEFORMATION OF POLY(ETHYLENE-TEREPHTHALATE) FILMS [J].
LAPERSONNE, P ;
BOWER, DI ;
WARD, IM .
POLYMER, 1992, 33 (06) :1277-1283
[8]   BENZENE-RING ORIENTATION IN UNIAXIAL-PLANAR POLY(ETHYLENE-TEREPHTHALATE) FILMS [J].
LAPERSONNE, P ;
BOWER, DI ;
WARD, IM .
POLYMER, 1992, 33 (06) :1266-1276
[9]  
LAPERSONNE P, 1991, J POLYM, V32, P3331
[10]  
LAPERSONNE P, 1991, THESIS U PARIS 6