ポリプロピレンの高次構造と引張特性に及ぼす圧延加工の影響

概要

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The injection-molded sheets of Polypropylene were used in this study. The tensile damage property in relation with the inner microstructure was examined on the testing temperatures ranging from -30 to 50℃ and different rolling ratio. The results are following as: (1) For the injection molded speciment treated by rolling the crystal structure has been broken together with the specimen material softens. The hardness of fracture surface and inhomogeneous distribution of orientation has been improved and the fracture surface becomes more uniform. (2) For the tensile testing of unrolling specimen under the temperature below 10℃, the strain within 10% is probable to the brittle fracture. However, the rolled specimen has a high stretch ratio at a relative lower temperature (-30℃) and the yield stress and the stretch ratio become higher with the increase of the rolling ratio. (3) For low rolling ratio the improvement of the mechanical property is impossible. However, the crystal was broken on the high ratio (60%). Because the non-crystal around crystal section became a more uniform, the orientation of molecular link was improved. It results in the increase in the plastic characterization and strength. (4) It is effective methods that increase in the material strength and ductile property by rolling processing. For low temperature, the obvious effect was understood as opposite to high temperature.
一般社団法人日本機械学会の論文
2000-05-25