| Project/Area Number |
18K19115
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 35:Polymers, organic materials, and related fields
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2018-06-29 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
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| Keywords | 高分子結晶 / 生分解 / ポリ乳酸 / 環境対応高分子材料 / 結晶化促進 / 液状添加物 / バイオ由来可塑剤 / 可塑剤 / 結晶化促進剤 / X線散乱 / 示差走査熱量測定 |
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| Outline of Final Research Achievements |
Poly(L-lactic acid) (PLLA) is one of the most popularly utilized biobased polymers. Although PLLA bears environmentally benign characteristics, there are crucial faults of PLLA such as slow crystallization. To improve crystallizability of PLLA, nucleation agents have been utilized. Although typical nucleation agents work at the solid state, we have reported that a special plasticizer can improve the crystallizability of PLLA. The results are significant because plasticizers are believed to delay crystallization of polymers by reducing the thermodynamical driving force of crystallization. We speculated that the lowering of the activation energy for the PLLA crystallization may be the main effect of the plasticizer.
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| Academic Significance and Societal Importance of the Research Achievements |
高分子材料をより機能的かつ有効なものにするために、結晶性の向上が求められているが、これまでに環境に悪影響を及ぼす固形の粒子状の添加剤が用いられてきた。本研究では、100%植物由来の液状添加剤をわずか１％添加するだけで格段に結晶化性能を向上させる結果が得られ、そのメカニズムを明らかにすることが出来た。用いた高分子材料も環境に優しい生分解性のポリ乳酸である。このように添加剤も環境に優しいため、100%環境対応型の高分子材料を提供することができたため、今後の環境問題解決に向けて有意義な指針を示すことが出来た。
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