Bio-adhesive based Modified Cassava Starch Waste/polyvinyl Alcohol Crosslinked with Tannic Acid for Wood Application
Keywords:Bio-adhesive, Starch waste, Sodium carboxymethyl starch, Polyvinyl alcohol, Tannic acid
This research aimed to add value to the waste cassava starch from the starch factory by synthesizing it as a carboxymethyl starch (CMS) and then using it as a raw material to prepare bio-adhesive and using tannic acid (TA) as a crosslinking agent. The cross-linking of the bio-adhesive was confirmed by the presence of ester bond peaks. The optimum amount of adhesive for use was 500 g/m2. The stable shear strength over 7 days was 2.35 MPa when used indoors at room temperature. However, the shear strength was decreased when used in high humidity conditions and outdoors due to both conditions increased free volume in the bio-adhesive structure, the polymer chains are easy to move. Bio-adhesives synthesized from waste cassava starch showed excellent properties to be applied in the wood industry for the added value to the waste cassava starch and also reduce the use of adhesives from petrochemicals.
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