STUDY ON CHEMICAL MODIFICATION OF CASSAVA STARCH  FOR INTENDED APPLICATION OF BIODEGRADABLE FILMS

Nguyễn Châu Giang; Vũ Minh Đức

doi:10.34238/tnu-jst.12972

STUDY ON CHEMICAL MODIFICATION OF CASSAVA STARCH FOR INTENDED APPLICATION OF BIODEGRADABLE FILMS

About this article

Received: 03/06/25 Revised: 14/11/25 Published: 17/11/25

Authors

1. Nguyen Chau Giang , School of Material Science and Engineering - Hanoi University of Science and Technology
2. Vu Minh Duc, School of Material Science and Engineering - Hanoi University of Science and Technology

Abstract

A polymer blend of poly(butylene adipate‐co‐terephthalate) and cassava starch was fabricated via a single‐step melt processing on a twin‐screw extruder instead of a multi‐stage procedure. To reduce the intrinsic polarity of the starch and enhance its compatibility with the poly(butylene adipate‐co‐terephthalate) matrix, the cassava starch was first modified with citric acid in a heated high‐speed mixer prior to being co‐melted with the polyester and glycerol plasticizer in a twin‐screw extruder. The starch modification in the high‐speed mixer was conducted under varying temperatures (from 80 °C to 100 °C) and citric acid concentrations (from 2 wt % to 3 wt % relative to starch), and the required glycerol content to achieve starch gelatinization during twin‐screw extrusion was also determined. Fourier transform infrared spectroscopy confirmed the esterification reaction of the starch in the heated mixer. The modified starch underwent simultaneous gelatinization to yield a modified thermoplastic starch, concurrently with the reactive extrusion blending with poly(butylene adipate‐co‐terephthalate), resulting in a starch based blend with only one step extrusion. The effects of plasticizer content, starch modification conditions, and starch loading on the mechanical properties and melt flow index of the resulting blends were systematically investigated.

Keywords

Starch; Citric acid; Poly(butylene adipate-co- terephatalate) (PBAT); Biodegradable film; Gelatination

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DOI: https://doi.org/10.34238/tnu-jst.12972

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