Thermal, mechanical, rheological and morphological properties of compatible poly(lactic acid)/ethylene vinyl acetate blends

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, COMPOSITES

Progress in Rubber Plastics and Recycling Technology Pub Date : 2022-04-09 DOI:10.1177/14777606221085988

M. Johar, K. Z. Zarkasi, F. Hashim, A. Rusli

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引用次数: 4

Abstract

This paper examines the effects of poly (ethylene-co-vinyl acetate) (EVA) with 40% vinyl acetate content on thermal, mechanical, rheological, and morphological properties of polylactic acid (PLA) blends. Thermal analysis indicated improvement of crystallinity in the presence of more EVA. With 15% EVA, the impact strength of the binary blend increased significantly (37.80 KJ/m2) at an optimum elongation at break due to the compatibility of the blend and the formation of fibrils. In the presence of % EVA, complete phase separation with the formation of EVA droplets in the PLA continuous phase resulted in a reduction of impact strength and elongation at break. Changes in compatibility and morphology lead to variation in rheological properties. The complex viscosity (η*) decreased with increasing EVA content up to 10% EVA but slightly increased at 15% EVA due to optimum interphase interaction between components in the compatible blend. In the presence of more than 20% EVA, η* reduced again due to the occurrence of phase separation. The variations in the mechanical and rheological properties of PLA/EVA blends are directly related to the state of compatibility and morphology of the blends.

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相容性聚乳酸/醋酸乙烯共混物的热、力学、流变和形态性能

本文研究了40%醋酸乙烯含量的聚乙烯-醋酸乙烯酯(EVA)对聚乳酸(PLA)共混物的热、力学、流变学和形态性能的影响。热分析表明，较多EVA的存在改善了结晶度。当EVA为15%时，由于共混物的相容性和原纤维的形成，在最佳断裂伸长率下，二元共混物的冲击强度显著提高(37.80 KJ/m2)。在% EVA存在的情况下，PLA连续相的完全相分离和EVA液滴的形成导致了冲击强度和断裂伸长率的降低。相容性和形态的变化导致了流变性能的变化。当EVA含量达到10%时，复合粘度(η*)随EVA含量的增加而降低，但当EVA含量达到15%时，由于相容性共混物中组分之间的最佳相间相互作用，复合粘度(η*)略有增加。当EVA含量大于20%时，η*又因相分离而降低。PLA/EVA共混物的力学和流变性能的变化与共混物的相容性和形貌直接相关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Rubber Plastics and Recycling Technology MATERIALS SCIENCE, COMPOSITES-POLYMER SCIENCE

CiteScore

4.40

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： The journal aims to bridge the gap between research and development and the practical and commercial applications of polymers in a wide range of uses. Current developments and likely future trends are reviewed across key areas of the polymer industry, together with existing and potential opportunities for the innovative use of plastic and rubber products.