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Advantage of preserving bi-orientation structure of isotactic polypropylene through die drawing
Lyu, D. Sun, Y.Y. Lai, Y.Q. Thompson, Glen P. Caton-Rose, Philip D. Coates, Philip D. Lu, Y. Men, Y.F.
Lyu, D.
Sun, Y.Y.
Lai, Y.Q.
Thompson, Glen P.
Caton-Rose, Philip D.
Coates, Philip D.
Lu, Y.
Men, Y.F.
Publication Date
2021-01
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© 2020, Chinese Chemical Society Institute of Chemistry, Chinese Academy of Sciences Springer-Verlag GmbH Germany, part of Springer Nature. Reproduced in accordance with the publisher's self-archiving policy.
The final publication is available at Springer via https://doi.org/10.1007/s10118-020-2465-z.
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openAccess
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2020-06-04
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Abstract
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.
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Accepted manuscript
Citation
Lyu D, Sun YY, Lai YQ et al (2021) Advantage of preserving bi-orientation structure of isotactic polypropylene through die drawing. Chinese Journal of Polymer Science. 39(1): 91-101.
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