射出成形速度によるPPの高次構造と引張特性の変化

概要

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The change of morphology and the tensile strength properties in various environment temperature (-40〜50℃) of PP by injection-modeled speed were determined. The results on the increase in the injection-modeled speed are following as (1) The decrease in the thickness of the skin and intermediate layer, however, the increase in the core layer. (2) The average hardness decreased on the speciment section, and the ductile showed a enlarge trend. It was the same as the result of dynamic Visco elasticity. (3) The change of the crystallinity was not obviously on the FT-IR, but the crystallinity increased by the density measurement. (4) The orientation of the core layer was a little change, however, it showed a lot of change on the intermediate layer. (5) The tensile strength decreased, but the ductile property showed increased at the various temperatures. Therefore, the crack origin of the various specimens on the tensile conditions occurred on the intermediate layer with high hardness and orientation. The low ductile property specimen due to a low injection-modeled speed will form the asymmetry inner multi-structure and the difference mechanical property as well as the distortion on the intermediate and core layers.
一般社団法人日本機械学会の論文
2001-06-25