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The Relationship between Bulk property and property distribution in Thin-Wall Injection Molded PP at Different Molecular Weight and Molecular Weight distribution

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Advances in Materials Physics and Chemistry 2016年第1期6卷 1-8页

作者： Keisuke Maeda Koji Yamada Kazushi Yamada Masaya Kotaki Hiroyuki Nishimura Department of Advanced Fibro Science Kyoto Institute of Technology Kyoto Japan Osaka Municipal Technical Research Institute Osaka Japan Center for Fiber and Textile Science Kyoto Institute of Technology Kyoto Japan Kaneka US Material Research Center Kaneka Americas Holding Inc. TX USA

Thin-wall injection molded parts have been paid much attention to the lightweight saving from viewpoints of natural resources saving. In the injection molding, skin-core structure can be found in the parts. This skin-core structure affects the property of completed injection molding parts (bulk property) even if in thin-wall injection molding. However, there is a few research about the relationship between bulk property and internal property distribution in the injection molding specimen. In this study, thin-wall injection molded parts of polypropylene (PP) were prepared by 4 different molecular weight and molecular weight distribution to reveal the relationship between bulk property and property distribution. These characteristics were investigated by using tensile test, fracture toughness characterized by Essential Work of Fracture (EWF) method for bulk property and film tensile test by sliced sample for tensile property distribution. The property distribution test results revealed that the highly bulk property sample had thicker highly mechanical property layer on its surface.

关键词： Molecular Weight Molecular Weight distribution Fracture Toughness property distribution Thin-Wall Injection Molding

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