STUDIES ON THE RELATIONSHIP BETWEEN ORIENTATION OF CRYSTALLINE AND NON-CRYSTALLINE PHASES AND MECHANICAL ANISOTROPY OF ISOTACTIC POLYPROPYLENE

Takahara Hirokazu, Kawai Hiromichi, Fukushima Akio, Yamaguchi Yutaka

doi:10.2115/fiber.27.349

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アイソタクチックポリプロピンンの延伸による結晶および非晶鎖セグメントの配向と弾性率の異方性について
アイソタクチックポリプロピレンノエンシンニヨルケッショウオヨビヒショウサセグメントノハイコウトダンセイリツノイホウセイニツイテ

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Abstract

Relationship between calculated and measured tensile moduli of uni- and biaxially oriented isotactic polypropylene specimens is investigated. The calculation of elastic modulus of bulk specimens is carried out on the basis of either the homogeneous stress or the homogeneous strain hypothesis using the uni- and biaxial orientation distribution of structural unit and their mechanical constants.<br>The calculated tensile modulus of both machine and transverse directions based on the homogeneous strain hypothesis are too high, while those based on the homogeneous stress hypothesis are rather close to the experimental results. For highly stretched specimen, morphology of the specimen from spherulite to highly oriented fiber texture, the calculated tensile modulus of transverse direction based on homogeneous strain hypothesis, however, is close to the experimental result.<br>The above calculation may be valid only for the glassy state of semi-crystalline polymers and other treatment based on the kinetic theory of polymer chains for non-crystalline phase may be necessary for rubbery state of the semi-crystalline polymers. The ratio of and are nearly 3 for the glassy state.

Journal

Sen'i Gakkaishi

Sen'i Gakkaishi 27 (8), 349-358, 1971

The Society of Fiber Science and Technology, Japan

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