Mechanical, thermal and morphological properties of polyvinyl alcohol/starch/carboxy methyl cellulose biodegradable blends

Author(s): Mohammad Taghi Taghizadeh, Narges Sabouri, Babak Ghanbarzadeh

Polyvinyl alcohol (PVA) / starch (S) /Carboxymethyl 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. Reactive hydroxyl groups were exposed on the CMC surface, which could establish new hydrogen bonds with polyvinyl alcohol and starch. 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. Adecrease in the thermal resistance of polyvinyl alcohol/ starch composite with the addition of CMCwas also observed bymeans of DSC (Differential scanning calorimetry) analysis. The SEM (Scanning electron microscopy) indicates morphological structure of the polyvinyl alcohol/starch films in the different percent of CMC.

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