立构复合结构增韧左旋聚乳酸的结构与性能研究
首发时间:2012-02-22
摘要:本文以左旋聚乳酸(PLLA)为基体聚合物材料、右旋聚乳酸-聚乙烯乙二醇-右旋聚乳酸(PDLA-PEG-PDLA)三嵌段共聚物作为增韧改性剂,通过熔融共混方法制备了PLLA/PDLA-PEG-PDLA共混物。采用红外光谱(FT-IR)、差热扫描量热仪(DSC)、X-射线衍射(XRD)和拉伸行为测试对PLLA和PLLA/PDLA-PEG-PDLA共混物的结构、晶型和力学性能进行了研究。结果表明,PDLA-PEG-PDLA三嵌段共聚物的加入,共混体系生成了PLA立构复合结构。与纯PLLA相比,PLLA共混物的玻璃化转变温度显著下降,热稳定性能明显改善,而且PLLA基体的韧性得到了较大程度的提高。
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Study on structure and properties of tough poly(l-lactide) upon stereocomplexes
Abstract:Poly(d-lactide)-poly(ethylene glycol)-poly(d-lactide) (PDLA-PEG-PDLA) triblock copolymer as a novel toughing agent has been incorporated into poly (l-lactide) (PLLA) matrix by melting blend. The presence of the PLA stereocomplex in the blend has been confirmed by Infrared spectroscopy (IR), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The thermal properties of the PLLA blend are improved and the glass transition temperature (Tg) is decreased because of the presence of the stereocomplex from the results obtained by DSC. The improvements in mechanical properties can potentially increase the utility of this biomass-based polymer. The toughness of PLLA blend with the stereocomplex is evaluated and a remarkable increase in the elongation at break for tough PLLA is observed. Therefore, the successful toughening of PLLA matrix may be achieved due to several mechanisms working synergistically.
Keywords: Poly (l-lactide) (PLLA) Stereocomplex structure Blends Toughen
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