Abstract
Polyvinyl alcohol (PVA) / starch (S) /Carboxy methyl cellulose (CMC) composite films were prepared from PVA, three different loading of CMC and soluble starch aqueous suspensions by casting method in the presence of plasticize containing glycerol. The effects of the CMC addition on the some physical properties of the resulted blend films were investigated. Tensile tests demonstrated positive results from mechanochemical treatment. With the addition of 20% CMC was an increase in the tensile strength and percentage elongation at break. The thermal properties of polyvinyl alcohol (PVA)/Starch(S)/Carboxymethyl cellulose (CMC) blends were investigated by thermogravimetry (TGA) and derivative thermogravimetry (DTG). At least four degradation distinct stages were identified in the PVA/S/CMC blends by means of using TGA, being assigned to the mass loss due to the plasticizer leaching, and to the degradation of the starch, CMC and PVA fractions. The thermal stability of PVA/S/CMC blends is higher than that of PVA/S suggesting that the addition of CMC improved the thermal stability of PVA/S blend. The SEM (Scanning electron microscopy) indicates morphological structure of the polyvinyl alcohol/starch films in the different percent of CMC.
Highlights
The severe environmental problems, including the increasing difficulties of waste disposal and the deepening threat of global warming caused by the nonbiodegradablility of a number of polymers have raised concerns all over the world[1]
This study reports on the effect of carboxy methyl cellulose content, on the properties of polyvinyl alcohol (PVA)/starch films, such as mechanical, thermal and morphological parameters
The thermal stability of PVA/S/Carboxymethyl cellulose (CMC) blends is higher than that of PVA/S suggesting that the addition of CMC improved the thermal stability of PVA/S blend
Summary
The severe environmental problems, including the increasing difficulties of waste disposal and the deepening threat of global warming (due to carbon dioxide release during incineration) caused by the nonbiodegradablility of a number of polymers (used in packaging and agriculture field) have raised concerns all over the world[1]. Biodegradable starch-based plastics such as starch/cellulose and starch/PVA have recently been investigated for their great potential marketability in agricultural foils, garbage and composting bags, and food packaging, in the fast food industry, and in biomedical fields [7,8,9,10]. Carboxy methyl cellulose is able to improve the mechanical and barrier properties of starch-based films [14]. This study reports on the effect of carboxy methyl cellulose content, on the properties of PVA/starch films, such as mechanical, thermal and morphological parameters. These studies were carried out to assess their potential uses as packaging films
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