Synthesis and Characterization of Chemically-Modified Cassava Starch Grafted with Poly(2-Ethylhexyl Acrylate) for Blending with Poly(Lactic Acid)

Ratthaphat Bunkerd, Robert Molloy, Runglawan Somsunan, Winita Punyodom, Paul D. Topham, Brian J. Tighe

Research output: Contribution to journalArticle

Abstract

Native cassava starch (CS) is chemically modified by grafting with 2‐ethylhexyl acrylate (EHA) monomer to make it more hydrophobic for improved blending with poly(lactic acid) (PLA). Grafting is carried out using CS:EHA weight ratios of 2:1, 1:1, 1:2, and 1:3 in a methanol‐water solvent mixture at 45 °C for 48 h. L‐Ascorbic acid and hydrogen peroxide are used as the redox initiating system. Following purification, the poly(2‐ethylhexyl acrylate)‐grafted starch, starch‐g‐PEHA, is obtained either as a finely divided powder or as a slightly tacky solid with % grafting values in the range of 13–26% by weight. The main objective of this chemical modification is to improve the interfacial adhesion between the starch particles and the PLA matrix through the hydrophobic PLA‐PEHA interactions. PLA/starch‐g‐PEHA blends are prepared in the form of solution‐cast films with weight ratios ranging from 100/0 to 60/40. Tensile testing of the films shows a marked increase in extensibility and toughness up to a loading of 10% starch‐g‐PEHA above which the properties deteriorated rapidly due to starch particle aggregation. Thus, for potential use as biodegradable film packaging, the best properties are obtained for the PLA/starch‐g‐PEHA 90/10 blend.
Original languageEnglish
JournalStarch - Stärke
Early online date21 May 2018
DOIs
Publication statusE-pub ahead of print - 21 May 2018

Bibliographical note

This is the peer reviewed version of the following article: Bunkerd, R. , Molloy, R. , Somsunan, R. , Punyodom, W. , Topham, P. D. and Tighe, B. J. (2018), Synthesis and Characterization of Chemically‐Modified Cassava Starch Grafted with Poly(2‐Ethylhexyl Acrylate) for Blending with Poly(Lactic Acid). Starch ‐ Stärke, which has been published in final form at https://doi.org/10.1002/star.201800093.  This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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