Effect of Thermoplastic Elastomer on Melt Rheological and Fracture Behavior of Poly(Lactic Acid)

Q2 Materials Science

Polymer-Plastics Technology and Engineering Pub Date : 2018-08-13 DOI:10.1080/03602559.2017.1381240

Ranjana Nehra, S. N. Maiti, Josemon Jacob

引用次数: 8

Abstract

ABSTRACT Poly(lactic acid) (PLA) was melt blended with thermoplastic elastomer, maleic anhydride grafted poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS-g-MA) copolymer with varied concentration (10–40 wt%) using twin screw extruder. Dynamic rheological behavior of PLA/SEBS-g-MA blends investigated a transition from liquid-like behavior to solid-like behavior in the composition range of 10–20 wt% of SEBS-g-MA. The capillary rheometer analysis showed enhanced shear viscosity with increase in SEBS-g-MA content. At 10 wt% of SEBS-g-MA, a maximum in the non-essential work of fracture was observed which reflects resistance to crack propagation. Scanning electron microscopy revealed a transition in deformation mechanisms from voids, to fibrillation and cavitation. GRAPHICAL ABSTRACT

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热塑性弹性体对聚乳酸熔体流变及断裂行为的影响

摘要采用双螺杆挤出机将聚乳酸(PLA)与热塑性弹性体、马来酸酐接枝不同浓度(10-40 wt%)的聚[苯乙烯-b-(乙烯-共丁烯)-b-苯乙烯](SEBS-g-MA)共聚物熔融共混。PLA/SEBS-g-MA共混物的动态流变行为研究了在SEBS-g-MA的10-20 wt%范围内从类液体行为到类固体行为的转变。毛细管流变仪分析表明，随着SEBS-g-MA含量的增加，剪切粘度增强。在SEBS-g-MA的10 wt%时，观察到非必要断裂功的最大值，这反映了对裂纹扩展的阻力。扫描电镜显示变形机制从空洞过渡到纤颤和空化。图形抽象

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