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Issue 18, 2016
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Fabrication of super tough poly(lactic acid)/ethylene-co-vinyl-acetate blends via a melt recirculation approach: static-short term mechanical and morphological interpretation

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Abstract

The mechanical properties such as tensile strength, tensile modulus, elongation-at-break and impact strength of poly(lactic acid) (PLA)/ethylene-co-vinyl-acetate copolymer (EVA, vinyl acetate content 50 weight percent) blends were evaluated at EVA volume fractions ranging from 0–0.35. The tensile properties were compared using several theoretical models. The blends lost little of their tensile strength and modulus while elongation-at-break was simultaneously enhanced. Efficient dispersion of EVA in PLA using a micro compounder in which there is provision for melt recirculation significantly improved the Izod impact strength making the blends super tough. The phase miscibility, two phase morphology, fibrillation and interparticle distance were studied using scanning electron microscopy (SEM). The blend is a two phase system where the particle size is enhanced upon an increase in the concentration of the blending copolymer. The normalized values of the relative elongation-at-break and Izod impact strength were enhanced significantly in accordance with the crystallinity, 33 fold (53.73 kJ mm−2) at a 0.35 volume fraction of EVA, which indicated softening of the system with enhanced toughness.

Graphical abstract: Fabrication of super tough poly(lactic acid)/ethylene-co-vinyl-acetate blends via a melt recirculation approach: static-short term mechanical and morphological interpretation

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Article information


Submitted
24 Nov 2015
Accepted
17 Jan 2016
First published
20 Jan 2016

RSC Adv., 2016,6, 14580-14588
Article type
Paper
Author version available

Fabrication of super tough poly(lactic acid)/ethylene-co-vinyl-acetate blends via a melt recirculation approach: static-short term mechanical and morphological interpretation

R. Kumar Singla, S. N. Maiti and A. K. Ghosh, RSC Adv., 2016, 6, 14580 DOI: 10.1039/C5RA24897C

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