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

Author:

Johar Munirah1,Zarkasi Kamarul Zaman2,Hashim Faiezah3,Rusli Arjulizan1ORCID

Affiliation:

1. School of Materials & Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Pulau Pinang, Malaysia

2. School of Biological Science, Universiti Sains Malaysia, Gelogor, Pulau Pinang, Malaysia

3. Faculty of Applied Sciences, Universiti Teknologi MARA, Arau, Perlis, Malaysia

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.

Funder

Ministry of Higher Education of Malaysia Fundamental Research Grant Scheme

Publisher

SAGE Publications

Subject

Materials Chemistry,Polymers and Plastics,Organic Chemistry,General Chemical Engineering

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