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Carbohydr Polym. 2016 Feb 10;137:515-524. doi: 10.1016/j.carbpol.2015.10.094. Epub 2015 Nov 1.

Property tuning of poly(lactic acid)/cellulose bio-composites through blending with modified ethylene-vinyl acetate copolymer.

Author information

1
Institute for Polymers, Composites and Biomaterials, IPCB-CNR, Sect. of Pisa, Pisa 56122, Italy. Electronic address: mariano.pracella@diccism.unipi.it.
2
Department of Civil & Industrial Engineering, University of Pisa, Pisa 56122, Italy. Electronic address: minhaz1978@gmail.com.
3
Department of Civil & Industrial Engineering, University of Pisa, Pisa 56122, Italy. Electronic address: massimo.paci@unipi.it.
4
Polymer Division, INTEMA-CONICET, University of Mar del Plata, 7600 Mar del Plata, Argentina. Electronic address: alvarezvera@fi.mdp.edu.ar.

Abstract

The effect of addition of an ethylene-vinyl acetate copolymer modified with glycidyl methacrylate (EVA-GMA) on the structure and properties of poly(lactic acid) (PLA) composites with cellulose micro fibres (CF) was investigated. Binary (PLA/CF) and ternary (PLA/EVA-GMA/CF) composites obtained by melt mixing in Brabender mixer were analysed by SEM, POM, WAXS, DSC, TGA and tensile tests. The miscibility and morphology of PLA/EVA-GMA blends were first examined as a function of composition: a large rise of PLA spherulite growth rate in the blends was discovered with increasing the EVA-GMA content (0-30 wt%) in the isothermal crystallization both from the melt and the solid state. PLA/EVA-GMA/CF ternary composites displayed improved adhesion and dispersion of fibres into the matrix as compared to PLA/CF system. Marked changes of thermodynamic and tensile parameters, as elastic modulus, strength and elongation at break were observed for the composites, depending on blend composition, polymer miscibility and fibre-matrix chemical interactions at the interface.

KEYWORDS:

Cellulose fibres; Crystallization; Ethylene-vinyl acetate; Mechanical properties; Poly(lactic acid); Polymer composites

PMID:
26686158
DOI:
10.1016/j.carbpol.2015.10.094
[Indexed for MEDLINE]

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