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Starch is promising material to answer the environmental hot issues related to plastic wastes. Plasticized and gelatinized starch can behave as thermoplastic that completely biodegrade in nature. This study was aimed to investigate the biodegradability of cassava starch (CS) blended with high density polyethylene (HDPE). Simulated soil burial was applied using the compost. The blends were prepared by reactive mixing using Haake Rheomix internal mixer. The ratio of starch and HDPE was ranging from 30/70, 40/60, 50/50, 60/40, and 70/30. Dual hydrophobization was employed, i.e. addition acetic acid and polyethylene-grated maleic anhydride (PE-g-MA). Compost burial was performed indoor for 56 days. The surface appearance and morphology were investigated. Weight loss and change in tensile strength and elongation at break after burial also determined. Results findings showed that the increasing of cassava starch content and burial time decrease the tensile strength and elongation at break, however increased the weight loss of CS/HDPE reactive blend. In addition, evidence of biodegradation is shown by the appearance of some microorganism colonies on the surface of reactive blend and morphological changes in CS/HDPE reactive blend.

Biodegradability of Cassava Starch/High Density Polyethylene Reactive Blend During Compost Burial