For amorphous poly(ethylene terephthalate) (PET), uniaxial deformation induces both chain orientation and crystallization. Conversely, the crystallinity drops on draw of highly crystalline (30-50%) PET. In contrast, crystals of isotactic polypropylene (i-PP) uniaxially drawn above glass transition (T//g) orient, but with no significant change in crystallinity. A comparison between i-PP and PET is made to distinguish the effect of biaxial deformation on pre-crystallized polymer (i-PP) and strain crystallizable polymer (PET). Trirefringence is used to characterize the orientation inducead by the deformation field on PET and i-PP.
|Original language||English (US)|
|Number of pages||3|
|Journal||Annual Technical Conference - Society of Plastics Engineers|
|State||Published - Dec 1 1986|
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