Morphology and properties of biodegradable poly (lactic acid)/poly (butylene adipate-co-terephthalate) blends with different viscosity ratio
Morphology and properties of biodegradable poly (lactic acid)/poly (butylene adipate-co-terephthalate) blends with different viscosity ratio
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DOI：
10.1016/j.polymertesting.2017.03.008
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发表时间：
2017-07-01
期刊：
影响因子：
5.1
通讯作者：
Xiao, Peng
中科院分区：
文献类型：
--
作者：
Lu, Xiang;Zhao, Jianqing;Xiao, Peng
相形态对聚合物共混物的性能有很大的影响。共混物形态的发展不仅取决于组分聚合物的本征结构，而且还取决于熔体加工中的外在因素，如粘度比、剪切力和温度。制备了不同熔体粘度的聚己二酸丁二醇酯-对苯二甲酸丁二醇酯（PBAT）材料，并在异向双螺杆挤出机中制备了不同粘度比的聚乳酸（PLA）/PBAT共混物。研究了粘度比对PLA/PBAT（70/30 wow）共混物的形态结构、力学性能、热性能和流变性能的影响。实验结果表明，PLA/ PBAT共混物的形态和性能强烈依赖于粘度比。与gimel > 1的样品相比，对于粘度比小于1（gimel < 1），观察到更细尺寸的PBAT相。结果表明，不同粘度比的PLA与PBAT的界面张力存在显著差异，粘度为0.77时界面张力最低，为0.12 mN/m。当粘度比为0.44时，PLA/PBAT共混物的拉伸强度最大，而当粘度比为1.95时，共混物的冲击性能最大。(C)2017爱思唯尔有限公司版权所有
Phase morphology exerts a tremendous influence on the properties of polymer blends. The development of the blend morphology depends not only on the intrinsic structure of the component polymers but also on extrinsic factors such as viscosity ratio, shearing force and temperature in the melt processing. In this study, various poly (butylene adipate-co-terephthalate) (PBAT) materials with different melt viscosity were prepared, and then poly (lactic acid) (PLA)/PBAT blends with different viscosity ratio were prepared in a counter-rotating twin-screw extruder under constant processing conditions. The influence of viscosity ratio on the morphology, mechanical, thermal and rheological properties of PLA/PBAT (70/30 wow) blends was investigated. The experimental results showed that the morphology and properties of PLA/ PBAT blends strongly depended on the viscosity ratio. Finer size PBAT phase were observed for viscosity ratio less than 1 (gimel < 1) compared to samples with gimel > 1. It was found that the interfacial tensions of PLA and PBAT were significantly different when the viscosity ratio was changed, the lowest interfacial tensions (0.12 mN/m) was obtained when the viscosity was 0.77. Additionally, the maximal tensile strength in PLA/PBAT blends were obtained when the viscosity ratio was 0.44, while the maximal impact properties were obtained when the viscosity ratio was 1.95. (C) 2017 Elsevier Ltd. All rights reserved.