| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Outline of Final Research Achievements |
Polymer foams have cellular structures which consist of solid polymer matrices and dispersed gas pores. Polymer foams exhibit good energy absorption property while they are light. The properties of polymer foams are known to strongly depend on the degree of foaming. But in addition to the degree of foaming, the properties can depend on the heterogeneity of the cellular structures. In this work, we prepared series of polymer foams with different heterogeneous cellular structures. We measured both the mechanical properties of these foams by the compression tests, and the cellular structures by microscope observations and image analyses. We introduced the cell strength parameter to characterize the strength of a cell against the compression. We showed that the heterogeneity of the cell strength parameter can be semi-quantitatively related to the stress-strain curve obtained by a direct compression test.
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