PS25 ポリ乳酸ブレンド材の圧縮特性評価(ポスターセッション)

概要

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Biodegradable polymers, Polylactide(PLA) have a potential to be engineering plastics because of energy and environmental reasons. Conventional polymers are made from the petroleum, but PLA is made from the starch whose source is plants. Thus, PLA is carbon-neutral because the carbon of the starch is from carbon dioxide in the air. PLA is brittle. So, it limits the use of PLA. To improve this brittleness, PLA have been blended with other flexible polymers. In this study, we use Poly butylene adipate-co-terephthalate(PBAT) as the blending polymer. PBAT is fully biodegradable and flexible, though its Young's modulus and tensile strength are inferior to PLA, breaking strain is much higher than PLA PBAT distributes evenly in the PLA matrix. By now, PLA and blended PLA were conducted static tensile tests, but not done compressive tests. So, we evaluated properties in the static and dynamic compressive tests. In result, addition 40 wt % PBAT to PLA, Young's modulus and yielding stress decrease, but maximum strain and the strain energy at crack initiation get larger. In addition, Young's modulus and yielding stress of neat PLA and blended PLA increase with the strain rate rising.
2009-07-24