Changes of Microstructure and Mechanical Properties of Injection-Molded Polypropylene Sheets by Rolling Process

Effects of rolling on the micro-morphology, degrees of crystallinity and molecular orientation, and mechanical properties such as dynamic viscoelasticity and tensile property were examined by using injection-molded polypropylene sheets. When the rolling processing was carried out, the specimen was s...

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Bibliographic Details
Published in:KOBUNSHI RONBUNSHU 1997/11/25, Vol.54(11), pp.778-784
Main Authors: QIU, Jianhui, KAWAGOE, Makoto, MIZUNO, Wataru, MORITA, Mikio, MIYAJI, Tomoaki
Format: Article
Language:Japanese
Subjects:
Crystallinity
Hardness
Orientation
Polypropylene
Rolling
Tensile Properties
Viscoelasticity
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Summary:Effects of rolling on the micro-morphology, degrees of crystallinity and molecular orientation, and mechanical properties such as dynamic viscoelasticity and tensile property were examined by using injection-molded polypropylene sheets. When the rolling processing was carried out, the specimen was softened as a whole, and the distribution of molecular orientation and hardness in the section became more uniform over the skin, intermediate, and core layers. In the tension test done in air at 10°C the unrolled specimen was ruptured at a strain below 10%, while the rolled specimen was not ruptured even at strain above 150%, showing excellent plasticity. Particularly for the specimen rolled to 50% in the reduction in thickness, not only the ductile property but also the tensile strength were greatly improved to show higher toughness.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.54.778