| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
Micro structures and stress-strain response of polypropylene with different spherulite size prepared by changing the cooling conditions in order to investigate effects of crystalline and amorphous structures on mechanical properties of crystalline polymers. The crystallinity, elastic modulus and yield stress increase with increasing spherulite size. We perform a polymer plasticity simulation considering a spherulite structure consisting of the amorphous and crystalline phases. Information on the crystallinity of spherulite obtained from experiments is introduced into a computational model. We thoroughly evaluate the effect of the spherulite structure on the material properties of polypropylene. Moreover, we investigate microscopic plasticity behavior of crystalline and amorphous phases by the molecular dynamics simulation. Localized slip deformation is propagated thorough the sample with kink rotation of molecular chains.
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