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Advantage of Preserving Bi-orientation Structure of Isotactic Polypropylene through Die Drawing
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作者 Dong Lyu Ying-Ying Sun +5 位作者 Yu-Qing Lai Glen Thompson Philip Caton-Rose Phil Coates Ying Lu Yong-Feng Men 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2021年第1期91-101,I0007,共12页
The isotactic polypropylene(iPP) usually shows a unique parent-daughter lamellae structure in which the parent and daughter lamellae are against each other with a near perpendicular angle(80° or 100°). Induc... The isotactic polypropylene(iPP) usually shows a unique parent-daughter lamellae structure in which the parent and daughter lamellae are against each other with a near perpendicular angle(80° or 100°). Inducing a high fraction of oriented cross-hatched structure in iPP during processing is desirable for designing the bi-oriented iPP products. We processed a commercial iPP via tensile-stretching and die-drawing to evaluate the structural evolution of oriented parent-daughter lamellae. It turned out that the die-drawing process had an advantage in attaining a high fraction of oriented cross-hatched structure of iPP, as compared to the free tensile stretching. Besides, the presence of α-nucleating agents affected the formation of oriented parent-daughter lamellae in the die-drawn samples whereas such influence diminished in the free stretched ones. It was found that the confined deformation inside the die led to the well-preserved oriented cross-hatched structure in the die-drawn iPP. 展开更多
关键词 Die-drawing Isotactic polypropylene Solid-state deformation bi-orientation WAXD
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