Effects of compatibilizers on the mechanical properties and interfacial tension of polypropylene and poly(lactic acid) blends
Effects of compatibilizers on the mechanical properties and interfacial tension of polypropylene and poly(lactic acid) blends
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DOI：
10.1007/s13233-010-0613-y
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发表时间：
2010-06
影响因子：
2.4
通讯作者：
Tae Wook Yoo;H. Yoon;S. Choi;Min Soo Kim;Y. H. Kim;W. Kim
中科院分区：
文献类型：
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作者：
Tae Wook Yoo;H. Yoon;S. Choi;Min Soo Kim;Y. H. Kim;W. Kim
研究了相容剂和水解对PP/PLA（80/20）共混物的拉伸强度、冲击强度、界面张力和形态结构的影响。对于水解前的PP/PLA（80/20）共混物，当PP-g-MAH含量为3份时，共混物的拉伸强度达到最大值，而对于水解后的PP/PLA（80/20）共混物，共混物的拉伸强度随PP-g-MAH含量的变化不大。对于水解前后的苯乙烯-乙烯-丁烯-苯乙烯-g-马来酸酐（SEBS-g-MAH）共混物，随着SEBS-g-MAH含量的增加，共混物的拉伸强度降低。PP/PLA（80/20）共混物的界面张力由松弛时间使用Palierne和Choi-Schowalter模型确定，并且在每个模型中PP-g-MAH含量为3 phr时显示出最小值。在PP/PLA（80/20）共混物中，加入SEBS-g-MAH后，共混物的冲击强度在水解前后均有较大幅度的提高。这表明PLA在水解后变得不那么脆。冲击强度表明SEBS-g-MAH是一种有效的冲击改性剂，以提高PP/PLA（80/20）共混物的冲击强度。
The effects of compatibilizers and hydrolysis on the tensile and impact strength, interfacial tension and morphology of the PP/PLA (80/20) blends were investigated. For the PP/PLA (80/20) blends before hydrolysis, the tensile strength of the blends reached a maximum when the polypropylene-g-maleic anhydride (PP-g-MAH) copolymer was added at 3 phr. For the PP/PLA (80/20) blends after hydrolysis, the tensile strength did not change appreciably with the PP-g-MAH content. For the blends with the styrene-ethylene-butylene-styrene-g-maleic anhydride (SEBS-g-MAH) before or after hydrolysis, the tensile strength of the blends decreased with increasing SEBS-g-MAH content. The interfacial tension of the PP/PLA (80/20) blend was determined from the relaxation time using the Palierne and Choi-Schowalter models, and showed a minimum value at a PP-g-MAH content of 3 phr in each model. For the PP/PLA (80/20) blends with the SEBS-g-MAH before and after hydrolysis, the increase in impact strength was more significant for the blends after hydrolysis. This suggests that PLA becomes less brittle after hydrolysis. The impact strength suggests that the SEBS-g-MAH is an effective impact modifier to improve the impact strength of the PP/PLA (80/20) blends.