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首页> 外文期刊>Journal of Applied Polymer Science >An Investigation of Melt Rheology and Thermal Stability of Poly(lactic acid)/Poly(butylene succinate) Nanocomposites
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An Investigation of Melt Rheology and Thermal Stability of Poly(lactic acid)/Poly(butylene succinate) Nanocomposites

机译：聚乳酸/聚丁二酸丁二醇酯纳米复合材料的熔体流变学和热稳定性研究

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摘要

A systematic investigation of the rheological and thermal properties of nanocomposites prepared with poly(lactic acid) (PLA), poly(butylene succinate) (PBS), and organically modified layered silicate was carried out. PLA/PBS/Cloisite 30BX (organically modified MMT) clay nanocomposites were prepared by using simple melt extrusion process. Composition of PLA and PBS polymers were fixed at a ratio of 80 to 20 by wt % for all the nanocomposites. Rheological investigations showed that high clay (> 3 wt %) contents strongly improved the viscoelastic behavior of the nanocomposites. Percolation threshold region was attained between 3 and 5 wt % of clay loadings. With the addition of clay content for these nanocomposites, liquid-like behavior of PLA/PBS blend gradually changed to solid-like behavior as shown by dynamic rheology. Steady shear showed that shear viscosity for the nanocomposites decreased with increasing shear rates, exhibiting shear-thinning non-Newtonian behavior. At higher clay concentrations, pseudo-plastic behavior was dominant, whereas pure blend showed almost Newtonian behavior. Thermogravimetric analysis revealed that both initial degradation temperature (at a 2% weight-loss) and activation energy of thermal decomposition nanocomposite containing 3 wt % of C30BX were superior to those of other nanocomposites as well as to those of PLA/PBS blend. Nanocomposite having 1 wt % of C30BX did not achieve expected level of thermal stability due to the thermal instability of the surfactant present in the organoclay.
机译：对由聚乳酸（PLA），聚丁二酸丁二醇酯（PBS）和有机改性的层状硅酸盐制备的纳米复合材料的流变学和热学性质进行了系统的研究。通过使用简单的熔融挤出工艺制备了PLA / PBS / Cloisite 30BX（有机改性MMT）粘土纳米复合材料。对于所有纳米复合材料，PLA和PBS聚合物的组成以80至20重量％的比例固定。流变学研究表明，高粘土含量（> 3 wt％）大大改善了纳米复合材料的粘弹性行为。渗透阈值区域达到粘土含量的3至5 wt％。随着这些纳米复合材料粘土含量的增加，PLA / PBS共混物的液体状行为逐渐改变为固体状行为，如动态流变学所示。稳定剪切表明，纳米复合材料的剪切粘度随着剪切速率的增加而降低，表现出剪切稀化的非牛顿行为。在较高的粘土浓度下，假塑性行为占主导，而纯掺混物几乎表现出牛顿行为。热重分析表明，含有3 wt％的C30BX的热分解纳米复合材料的初始降解温度（失重2％）和活化能均优于其他纳米复合材料以及PLA / PBS共混物。由于存在于有机粘土中的表面活性剂的热不稳定性，具有1重量％的C30BX的纳米复合材料没有达到预期的热稳定性水平。

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