Effect of starch types on properties of biodegradable polymer based on thermoplastic starch process by injection molding technique (original) (raw)

2015, Songklanakarin Journal of Science and Technology

10 Due to limitations of thermoplastic starch (TPS), effect of starch types on properties 11 of biodegradable polymer based on TPS was investigated. Different types of starch; 12 containing different contents of amylose and amylopectin, were used, i.e. cassava starch, 13 mungbean starch and arrowroot starch. The TPS polymers were compounded and shaped 14 using an internal mixer and an injection molding machine, respectively. It was found that the 15 amount of amylose and amylopectin contents on native starch influence the properties of the 16 TPS polymer. The high amylose starch of TPMS led to higher strength, hardness, degree of 17 crystallization than the high amylopectin starch of TPCS. In addition, function group analysis 18 by Fourier transforms infrared spectrophotometer (FTIR), water absorption and 19 biodegradation by soil burial test were also examined. 20