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首页> 外文期刊>Journal of Applied Polymer Science >Effects of Mixing Protocols on Impact Modified Poly(lactic acid) Layered Silicate Nanocomposites
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Effects of Mixing Protocols on Impact Modified Poly(lactic acid) Layered Silicate Nanocomposites

机译：混合方案对冲击改性聚乳酸​​层状硅酸盐纳米复合材料的影响

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摘要

Poly(lactic acid)/2 wt % organomodified montmorillonite (PLA/OMMT) was toughened by an ethylene-methyl acrylate-glycidyl methacrylate (E-MA-GMA) rubber. The ternary nanocomposites were prepared by melt compounding in a twin screw extruder using four different addition protocols of the components of the nanocomposite and varying the rubber content in the range of 5-20 wt %. It was found that both clay dispersion and morphology were influenced by the blending method as detected by X-ray diffraction (XRD) and observed by TEM and scanning electron microscopy (SEM). The XRD results, which were also confirmed by TEM observations, demonstrated that the OMMT dispersed better in PLA than in E-MA-GMA. All formulations exhibited intercalated/partially exfoliated structure with the best clay dispersion achieved when the clay was first mixed with PLA before the rubber was added. According to SEM, the blends were immiscible and exhibited fine dispersion of the rubber in the PLA with differences in the mean particle sizes that depended on the addition order. Balanced stiffness-toughness was observed at 10 wt % rubber content in the compounds without significant sacrifice of the strength. High impact toughness was attained when PLA was first mixed with the clay before the rubber was added, and the highest tensile toughness was obtained when PLA was first compounded with the rubber, and then clay was incorporated into the mixture. Thermal characterization by DSC confirmed the immiscibility of the blends, but in general, the thermal parameters and the degree of crystallinity of the PLA were not affected by the preparation procedure. Both the clay and the rubber decreased the crystallization temperature of the PLA by acting as nucleating agents. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41518.
机译：通过乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯（E-MA-GMA）橡胶使聚（乳酸）/ 2重量％的有机改性蒙脱石（PLA / OMMT）增韧。三元纳米复合材料是通过在双螺杆挤出机中使用纳米复合材料组分的四种不同添加方案熔融混合并在5-20 wt％的范围内改变橡胶含量来制备的。发现通过X射线衍射（XRD）检测以及通过TEM和扫描电子显微镜（SEM）观察到的共混方法，粘土的分散性和形态均受到影响。 TEM观察也证实了XRD结果，表明OMMT在PLA中的分散性好于E-MA-GMA。当在添加橡胶之前首先将粘土与PLA混合时，所有配方均表现出插层/部分剥离结构，并具有最佳的粘土分散性。根据SEM，共混物是不混溶的，并且显示出橡胶在PLA中的精细分散，其平均粒径的差异取决于添加顺序。在胶料中橡胶含量为10 wt％时，观察到平衡的刚度-韧性，而强度没有显着降低。当在添加橡胶之前先将PLA与粘土混合时，可获得高的冲击韧性，而当将PLA与橡胶混合后再将粘土掺入混合物中时，则可获得最高的拉伸韧性。通过DSC的热表征证实了共混物的不溶混性，但是一般而言，PLA的热参数和结晶度不受制备程序的影响。粘土和橡胶均通过充当成核剂而降低了PLA的结晶温度。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41518。

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