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Processability and Foamability of Marine Degradable Bio-polymer,Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH),and its Cellulose Nanofiber Composites / 海洋分解性バイオポリマー(PHBH)およびセルロースナノファイバーとのコンポジットの成形と発泡性Lee, Jisuk 23 March 2023 (has links)
京都大学 / 新制・課程博士 / 博士(工学) / 甲第24647号 / 工博第5153号 / 新制||工||1984(附属図書館) / 京都大学大学院工学研究科化学工学専攻 / (主査)教授 大嶋 正裕, 教授 佐野 紀彰, 教授 山本 量一 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM
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Enhancing poly(lactic acid) microcellular foams by formation of distinctive crystalline structuresLi, R., Ye, L., Zhao, X., Coates, Philip D., Caton-Rose, Philip D. 13 January 2021 (has links)
Yes / By controlling the crystallization behavior of poly(lactic acid) (PLA) in the presence of a hydrazide nucleating agent (HNA), PLA-HNA foams with enhanced microcellular structures were prepared via supercritical CO2 foaming. It was found that HNA can self-assemble into fibrillar networks, inducing the crystallization of PLA on their surface, and "shish-kebab"crystalline structures with high crystallinity formed, which can be maintained during the whole foaming process. Incorporation of HNA promoted the formation of gt conformers, improved the amount of dissolved CO2, hindered the escape of CO2, and increased the viscoelasticity of PLA. Compared with neat PLA foam, for PLA-HNA foam, the average cell diameter decreased obviously, from 64.39 to 6.59 μm, while the cell density increased up to nearly three orders of magnitudes, from 6.82 × 106 to 4.44 × 109 cells/cm3. Moreover, lots of fibrillar structures appeared and entangled with each other on the cell wall of the foam. By forming such dense micropores and enhanced fibrillar structures, PLA foam was highly reinforced with significantly improved compressive strength. / This research was financially supported by National Natural Science Foundation of China (grant no. 51773122) and State Key Laboratory of Polymer Materials Engineering (grant no. sklpme2019-2-21).
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CONTINUOUS PRODUCTION OF MICROCELLULAR FOAMSHan, Xiangmin 29 January 2003 (has links)
No description available.
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