Sorption characteristic of tapioca starch/CNP film and their relationship to mechanical properties

Awang Kechik, Nurul Rashidah (2017) Sorption characteristic of tapioca starch/CNP film and their relationship to mechanical properties. [Project Paper] (Submitted)

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Abstract

Biopolymer such as tapioca starch has been considered as a potential environmentally friendly substitute for the use of plastic packaging materials. Due to the poor performance of tapioca starch film, nanofiller such as chitosan nanoparticle (CNP) can be incorporated into the starch matrix to improve water sorption and mechanical properties. Moreover, biopolymers from natural resources are sensitive to the surrounding conditions such as relative humidity and temperature. Hence, the aim of this study was to investigate the effect of the different relative humidities (23%, 50% and 75%) and temperatures (4°C, 30°C and 40°C) on water sorption and mechanical properties of the tapioca starch/CNP films The tapioca starch/CNP films were produced by using solvent casting method. From the water sorption study, the equilibrium moisture content of both neat tapioca starch films and tapioca starch/CNP films were found to increase with the increase in relative humidity but decreased with the increase in temperature (rephrase). For the investigation of water absorption and equilibrium moisture content of both film samples, the sorption isotherm models which were Peleg Model and GAB Model fittings show good agreement to the experimental data and predicted data. The mechanical properties of films were investigated using TA XT Plus Texture Analyzer to determine the tensile strength, elongation at break and Young’s modulus of the films. Study on mechanical properties shows that there was decrease of tensile strength at different temperature with increasing relative humidity. There was a major decreasing trend for the Young’s modulus with the increase in relative humidity which indicated that the stiffness of the films increased due to structure modification of starch network. The elongation at break was observed to decrease at high relative humidity due to water plasticizing effect. The addition of CNP improved the mechanical properties at temperature of 30°C at relative humidity of 50%. Equilibrium moisture content of films play an important role in starch based plastic manufacturing especially for storage and transportation in order to prevent deterioration of the film which can reduce its shelf life. The moisture sorption characteristic and mechanical properties of starch based films are critical to be determined because the characteristic affected their stability and application of the films in packaging field. It was found that, the incorporation of CNP in the starch film is a promising route to improve the water sorption and mechanical properties of the starch films for food packaging films.

Item Type:	Project Paper
Faculty:	Faculty of Engineering
Depositing User:	Ms. AZLINA ZAINAL ABIDIN
Date Deposited:	15 Nov 2022 04:08
Last Modified:	15 Nov 2022 04:08
URI:	http://psaspb.upm.edu.my/id/eprint/555

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