复合增塑剂种类对玉米淀粉塑化性能的影响

Effect of composite plasticizer types on plasticization properties of corn starch

采用甘油、甲酰胺和尿素按不同比例混合,作为复合增塑剂对玉米淀粉进行塑化处理,通过单螺杆挤出机挤出制备热塑性淀粉(TPS),研究了复合增塑剂种类对淀粉塑化性能的影响。利用DSC和SEM对塑化效果进行了表征,并对TPS的热稳定性、机械性能和吸水率进行了测试。结果表明,复合增塑剂采用甘油/甲酰胺/尿素三者混合时,对淀粉的塑化效果最好,制备的TPS热稳定性和机械性能都较好,吸水率较低。

Corn starch was plasticized by composite plasticizer mixed with glycerin, formamide and urea, and thermoplastic starch （TPS） was prepared by single screw extruder. The influence factor of starch plasticization properties was studied by composite plasticizer mixed with different ratio. DSC and SEM were used to charactized the plasticizing effect of TPS, and thermal stability, mechanical properties and water absorption of TPS were also studied. The results show that when composite plasticizer was mixed with glycerol-formamide urea, the plasticizing effect of starch was best. The thermal stability and mechanical property of TPS were better and lower water absorption rate.