Effect of stereocomplex crystal and flexible segments on the crystallization and tensile behavior of poly(l-lactide).
Effect of stereocomplex crystal and flexible segments on the crystallization and tensile behavior of poly(l-lactide).
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立体络合物晶体和柔性链段对聚L-丙交酯结晶和拉伸行为的影响
DOI：
10.1039/c8ra05355c
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发表时间：
2018-08-07
期刊：
影响因子：
3.9
通讯作者：
Wang, De-Yi
中科院分区：
文献类型：
--
作者：
Li, Xiaolu;Zhang, Xiuqin;Liu, Guoming;Yang, Zhongkai;Yang, Bo;Qi, Yue;Wang, Rui;Wang, De-Yi
采用差示扫描量热法（DSC）、偏光显微镜（POM）、广角X射线衍射（WAXD）和拉伸试验等手段，系统研究了聚乙二醇（PEG）和聚乳酸（PDLA）嵌段对聚乳酸（PLLA）结晶性能和力学性能的影响。采用原位WAXD研究了所得共混物在玻璃化转变温度以上单轴拉伸过程中的结构演变。结果表明，立体复合物（SC）晶体促进了PLLA均晶（α/α′晶体）的成核，柔性PEG嵌段可加快球晶的生长速率。PLLA/PDLA-PEG-PDLA具有比PLLA/PDLA更高的断裂伸长率，而拉伸强度和刚度没有显著损失。原位WAXD表明PLLA/PDLA-PEG-PDLA在拉伸过程中结晶更快。结果表明，SC晶体和柔性PEG嵌段的引入不仅可以加速PLLA的结晶，而且可以改善PLLA的韧性。
The effects of poly(ethylene glycol) (PEG) and/or poly(d-lactide) (PDLA) blocks on the crystallization and mechanical properties of poly(l-lactide) (PLLA) were investigated systematically via differential scanning calorimetry (DSC), polarized optical microscopy (POM), wide-angle X-ray diffraction (WAXD) and tensile testing. The structural evolution during uniaxial stretching of the obtained blends above the glass transition temperature was studied by in situ WAXD. It was observed that the stereocomplex (SC) crystals promoted the nucleation of PLLA homocrystals (α/α′ crystal), and flexible PEG blocks could enhance the spherulitic growth rate. The PLLA/PDLA–PEG–PDLA had a higher elongation at break than that of PLLA/PDLA without significant loss in tensile strength and stiffness. In situ WAXD showed that the PLLA/PDLA–PEG–PDLA crystallized faster during stretching. It was shown that the incorporation of SC crystals and flexible PEG blocks could not only accelerate the crystallization but also improve the toughness of PLLA.
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