添加聚氨酯對於聚(3-羥基丁酸酯)/聚(L-乳酸)摻混系統相分離與結晶行為之影響

Effects of adding poly(ester urethane) on the phase separation and crystallization behaviors of poly(3-hydroxybutyrate)/poly(L-lactic acid) blend systems

林楷崴(Kai-Wei Lin)

指導教授 ： 孫一明

元智大學/工程學院/化學工程與材料科學學系/碩士(2011年)

https://doi.org/10.6838/YZU.2011.00160

摘要

本研究將兩種半結晶性高分子─聚(3-羥基丁酸酯) (PHB)與聚(L-乳酸) (PLLA)以不同比例摻混，並在這摻混系統中添加聚氨酯，以增益兩種半結晶性高分子之相容性及探討聚氨酯對於了兩種結晶高分子摻混時之結晶影響。此聚氨酯是由雙羥基聚(3-羥基丁酸酯) (PHB-diol)與雙羥基聚乳酸 (PLLA-diol) 藉由1,6-己二氰酸酯(HMDI) 當偶合劑架橋聚合而成，且經由GPC、IR、NMR鑑定以成功合成此聚氨酯。本研究藉由微差式掃描熱卡計(DSC)、廣角X光繞射儀(WAXD)、小角X光散射儀探(SAXS)討其結晶結構與結晶行為，以及經由蝕刻及拉力測試探討其相容性。
當添加聚氨酯到摻混系統時，PHB的結晶速度變慢、PLLA的鏈移動能力增加。根據DSC的結果，此聚合物對於PHB來說是抑制了PHB的結晶速率，但對於PLLA來說卻是增加了PLLA的鏈移動能力。而在結晶結構上聚氨酯對於PHB與PLLA之微結晶結構無明顯影響，但影響了PHB與PLLA的層狀結晶結構，特別是在B20L80比例下PHB之層狀結構增厚。PHB/PLLA像分離行為再添加聚氨酯下有些微改善，而以B20L80最為明顯。PHB/PLLA機械性質也再添加聚氨酯後提升，也以B20L80最為顯著。

關鍵字

聚(3-羥基丁酸酯) ； 聚乳酸 ； 摻混 ； 廣角X光繞射儀 ； 小角X光散射儀

並列摘要

The compatibility of poly(3-hydroxybutyrate) (PHB)/poly(L-lactide) (PLLA) blend in various compositions (100/0, 80/20, 50/50, 20/80, and 0/100), with and without compatibilizer, was investigated,. The compatibilizer was prepared from poly(3-hydroxybutyrate)-diol (PHB-diol) and poly(L-lactic acid)-diol (PLLA-diol) using 1,6-hexamethylene diisocyanate (HMDI) as a coupling reagent. With the evidence from GPC, IR and NMR results, we have confirmed that poly(PHB/PLLA urethane) (PEU) was successfully synthesized from PHB-diol and PLLA-diol. The thermal properties of PHB/PLLA with and without compatibilizer were observed by differential scanning calorimetry (DSC), and the crystallization behaviors and crystalline structures were analyzed by wild-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). The miscibility was confirmed by an etching treatment and tensile test. When PEU was added in the blends, Tc of PHB and Tg of PLLA shifted to lower temperature. According to the results of WAXD, the crystalline lattice structure of PHB and PLLA, respectively, was not influenced by PEU. As indicated by the SAXS patterns, the lamellar thickness of the crystalline phase of PHB in the blends was become thick by PEU. The miscibility of the blends was slightly improved and the mechanical properties of the blends were increased by adding PEU. In a conclusion, PEU can improve the interfacial adhesion between PHB phase and PLLA phase in blends.

並列關鍵字

poly(3-hydroxybutyrate)-diol (PHB-diol) ； poly(L-lactic acid)-diol (PLLA-diol) ； poly(ester urethane)s (PEU)s ； compatibilizer ； blend ； wild-angle X-ray diffraction ； small-angle X-ray scattering

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