Stereocomplexed Poly(lactide) Composites toward Engineering Plastics with Superior Toughness, Heat Resistance and Anti-hydrolysis
Stereocomplexed Poly(lactide) Composites toward Engineering Plastics with Superior Toughness, Heat Resistance and Anti-hydrolysis
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具有优异韧性、耐热性和抗水解性的立体络合聚丙交酯复合材料用于工程塑料
DOI：
10.1007/s10118-020-2443-5
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发表时间：
2020-07
影响因子：
4.3
通讯作者：
Ma Pi-Ming
中科院分区：
文献类型：
--
作者：
Wu Bao-Gou;Yang Wei-Jun;Niu De-Yu;Dong Wei-Fu;Chen Ming-Qing;Liu Tian-Xi;Du Ming-Liang;Ma Pi-Ming
聚丙交酯具有脆性大、热变形温度低等缺点，限制了其作为工程塑料的应用。本工作采用熔融共混法制备了聚乳酸/聚乳酸/甲基丙烯酸缩水甘油酯无规共聚物(poly(L-lactide)/poly(D-lactide)/ethylene-vinyl/PDLA/EVm-GMA=1/1/x)复合材料，原位生成的共聚物改善了聚乳酸与乙烯-甲基丙烯酸缩水甘油酯的相容性。随后，在模压成型过程中对共混物进行了两步退火处理，即首先在120℃下进行退火，以快速形成一定量的立体复合体(Sc)晶体作为成核点，然后在200℃下进行退火，以引导新的sc晶体的形成。差示扫描量热仪(DSC)和广角X射线衍射仪(WAXD)的测量证实了高度立体络合的聚乳酸产物的形成。力学性能测试结果表明，当EVM-GMA的质量分数为20wt%时，PLLA/PDLA共混物的缺口冲击强度达到65kJ/m2，断裂伸长率达到48%，拉伸强度保持在40 Mpa。同时，动态力学分析(DMA)和热变形测试表明，聚乳酸复合材料的热变形温度高达142℃，比普通聚乳酸产品高出90℃。扫描电子显微镜(SEM)证实了EVM-GMA粒子的细小分散，有助于了解EVM-GMA的增韧机理。此外，高度立体复合的聚乳酸复合材料同时表现出优异的耐化学性和耐水解性。因此，这些令人着迷的性质可能会扩大sc-pla材料作为工程生物塑料的应用范围。
Poly(lactide), PLA, suffers from brittleness and low heat deflection temperature (HDT), which limits its application as an engineering plastic. In this work, poly(L-lactide)/poly(D-lactide)/ethylene-vinyl acetate-glycidyl methacrylate random copolymer (PLLA/PDLA/EVM-GMA = 1/1/x) composites were prepared by melt blending, and the in situ formed EVM-g-PLA copolymers improved the compatibility between PLA and EVM-GMA. Subsequently, the blends were subjected to a two-step annealing process during compression molding, i.e. first annealing at 120 °C to rapidly form a certain amount of stereocomplex (sc) crystallites as nucleation sites, and then annealing at 200 °C to guide the formation of new sc crystallites. Both differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD) measurements confirmed the formation of highly stereocomplexed PLA products. Mechanical results showed that the PLLA/PDLA blend with 20 wt% of EVM-GMA had a notched impact strength up to 65 kJ/m2 and an elongation at break of 48%, while maintaining a tensile strength of 40 MPa. Meanwhile, dynamic mechanical analysis (DMA) and heat deflection tests showed that the PLA composite had an HDT up to 142 °C which is 90 °C higher than that of normal PLA products. Scanning electron microscopy (SEM) confirmed the fine dispersion of EVM-GMA particles, which facilitated to understand the toughening mechanism. Furthermore, the highly stereocomplexed PLA composites simultaneously exhibited excellent chemical and hydrolysis resistance. Therefore, these fascinating properties may extend the application range of sc-PLA material as an engineering bioplastic.
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影响因子：
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作者：
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影响因子：
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