Publication Date:
2016-04-07
Description:
X-ray diffractometry is used to study samples of type PM-A group B polyimide (Kapton H) subjected to uniaxial tension at room temperature and cooling to liquid nitrogen and helium temperatures. An asymmetry in the halo of the diffraction pattern from the amorphous sample is observed as a result of deformation and cooling of the samples. Deformation and cooling are found to have different effects on the intensity distribution. Thus, deformation produces “stretched” regions, while cooling produces “compressed” regions. An analysis of the diffraction patterns shows that uniaxial tension leads to partial ordering of the polyimide molecules in a sample along the direction of the applied load. The observed changes in the structure during cooling of films may indicate that mutual ordering of some of the molecules relative to one another is taking place.
Print ISSN:
1063-777X
Electronic ISSN:
1090-6517
Topics:
Physics
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