Hou Ao-Lin, Qu Jin-Ping
National Engineering Research Center of Novel Equipment for Polymer Processing, Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
Polymers (Basel). 2019 May 1;11(5):771. doi: 10.3390/polym11050771.
In recent years, poly(lactic acid) (PLA) has attracted more and more attention as one of the most promising biobased and biodegradable polymers. However, the inherent brittleness significantly limits its wide application. Here, ternary blends of PLA, poly(ε-caprolactone) (PCL) with various amounts of ethylene-methyl acrylate-glycidyl methacrylate (EMA-GMA) terpolymer were fabricated through reactive melt blending in order to improve the toughness of PLA. The effect of different addition amounts of EMA-GMA on the mechanical properties, interfacial compatibility and phase morphology of PLA/PCL blends were studied. The reactions between the epoxy groups of EMA-GMA and carboxyl and hydroxyl end groups of PLA and PCL were investigated thorough a Fourier transform infrared (FT-IR). The miscibility and thermal behavior of the blends were studied through a dynamic mechanical analysis (DMA), differential scanning calorimetric (DSC) and X-ray diffraction (XRD). The phase morphology and impact fracture surface of the blends were also investigated through a scanning electron microscope (SEM). With the addition of 8 phr EMA-GMA, a PLA/PCL (90 wt %:10 wt %)/EMA-GMA ternary blend presenting a suitable multiple stacked phase structure with an optimum interfacial adhesion exhibited an elongation at break of 500.94% and a notched impact strength of 64.31 kJ/m with a partial break impact behavior. Finally, the toughening mechanism of the supertough PLA based polymers have been established based on the above analysis.
近年来，聚乳酸（PLA）作为最具前景的生物基和可生物降解聚合物之一，受到了越来越多的关注。然而，其固有的脆性显著限制了它的广泛应用。在此，通过反应性熔融共混制备了PLA、聚（ε-己内酯）（PCL）与不同含量的乙烯-甲基丙烯酸甲酯-甲基丙烯酸缩水甘油酯（EMA-GMA）三元共聚物的共混物，以提高PLA的韧性。研究了不同添加量的EMA-GMA对PLA/PCL共混物力学性能、界面相容性和相形态的影响。通过傅里叶变换红外光谱（FT-IR）研究了EMA-GMA的环氧基团与PLA和PCL的羧基及羟基端基之间的反应。通过动态力学分析（DMA）、差示扫描量热法（DSC）和X射线衍射（XRD）研究了共混物的相容性和热行为。还通过扫描电子显微镜（SEM）研究了共混物的相形态和冲击断裂表面。添加8份（质量份）EMA-GMA时，具有合适的多重堆叠相结构且界面粘附性最佳的PLA/PCL（90 wt%:10 wt%）/EMA-GMA三元共混物的断裂伸长率为500.94%，缺口冲击强度为64.31 kJ/m，呈现部分断裂冲击行为。最后，基于上述分析建立了超韧性PLA基聚合物的增韧机理。
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