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Thermal behaviour and interactions of cassava starch filled with glycerol plasticized polyvinyl alcohol blends

Wan Abdul Rahman, Wan Aizan and Rahmat , Abdul Razak and Abd Samad, Adlina and L. T., Sin (2010) Thermal behaviour and interactions of cassava starch filled with glycerol plasticized polyvinyl alcohol blends. Carbohydrate Polymers, 81 (4). 805 - 810. ISSN 0144-8617

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Official URL: http://dx.doi.org/10.1016/j.carbpol.2010.03.052

Abstract

Thermalbehaviour and interactions of glycerolplasticizedpolyvinylalcohol (PVOH)–cassavastarch (CSS) blended films were analysed using thermogravimetry and differential scanning calorimetry methods. The outcomes showed that addition of glycerol has reduced the onset and end-point melting temperatures of the blended films. Samples with 30 and 40 wt.% of PVOH–glycerol blended with CSS exhibited experimental enthalpy of melting (?Hm) lower than theoretical enthalpy of melting (?Hmi). Meanwhile, the thermogravimetry degradation of the PVOH–glycerol–cassavastarch can be divided into three phases, whereby phase 1 is the vaporization of volatiles, phase 2 is the rapid decomposition/dehydration and elimination of degradants and phase 3 is the formation of carbonaceous residues. These samples have thermogravimetry degradation activation energy (Ea) higher than their original components. For instance, 20 wt.% of PVOH–glycerol blended with CSS has a Ea which is 6.36 and 4.07 times higher than glycerolplasticized PVOH and CSS, respectively. Blending of PVOH–glycerol and CSS are favorable to produce biodegradable compounds resist to thermal attacks.

Item Type:Article
Uncontrolled Keywords:polyvinylalcohol, cassavastarch, glycerol, thermogravimetry, DSC
Subjects:Q Science > QD Chemistry
Divisions:Chemical Engineering
ID Code:26585
Deposited By: Liza Porijo
Deposited On:18 Jul 2012 03:25
Last Modified:06 Aug 2012 03:40

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