THE USE OF SYNCHROTRON RADIATION FOR STUDY OF STRUCTURAL-CHANGES IN POLYMERS DURING PHASE-TRANSITION AND DEFORMATION

被引:14
作者
FORGACS, P
SHEROMOV, MA
TOLOCHKO, BP
MEZENTSEV, NA
PINDURIN, VF
机构
[1] ACAD SCI USSR,INST NUCL PHYS,NOVOSIBIRSK 630090,USSR
[2] ACAD SCI USSR,INST PHYSICOCHEM BASIS MINERAL PROC,NOVOSIBIRSK 630090,USSR
关键词
PHASE TRANSITION;
D O I
10.1002/pol.1980.180181101
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Experimental method using monochromatized synchrotron radiation for a wide-angle x-ray scattering study of polymers during phase transition and deformation is described. Results obtained on low-density and high-density polyethylenes and on polypropylene are given. Melting processes could be studied conveniently by making exposures during a temperature scan; a few seconds were found sufficient to obtain a diffraction spectrum. This way relatively fast crystallization processes and the structural change accompanying stress relaxation could be followed easily. The crystalline-amorphous ratio was found to decrease continuously much below the melting temperature measured dilametrically and by DSC, implying that in the alpha //c-relaxation transition region of polyethylene and polypropylene was found to be stronger than the 110 one, while after crystallization has been completed this ratio was inverted. Equatorial spectra made after rapid uniaxial stretching of polypropylene sheet were found to exhibit a slight time dependence demonstrating that orientation went on after stretching had been stopped.
引用
收藏
页码:2155 / 2168
页数:14
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