不同增塑剂对直链淀粉增塑效果的影响

摘要

为预测尿素、乙二醇、三聚氰胺、二甲亚砜(DMSO)以及聚乙烯醇(PVA)对直链淀粉增塑效果的影响,采用分子动力学模拟法在COMPASS力场下模拟计算不同增塑剂对直链淀粉增塑后玻璃化温度的影响,并采用实验方法测定不同增塑剂对直链淀粉增塑后旋转扭矩、氢键削弱作用和力常数的变化.通过比较不同增塑剂对直链淀粉增塑前后的玻璃化温度、旋转扭矩、氢键削弱作用和力常数变化预测不同增塑剂增塑效果.结果表明,不同增塑剂对淀粉的增塑效果为尿素＞乙二醇＞ DMSO＞ PVA＞三聚氰胺.%The effect of urea,glycol,melamine,dimethyl sulfoxide (DMSO) and polyvinyl alcohol (PVA) on starch plasticization was investigated by the method of molecular dynamics simulations in the COMPASS force field.Glass transition temperature,rotational torque and hydrogen bonding interactions were detected to predict the effect of different plasticizers.The results showed that plasticizing effect of amylose by different alcohol are:urea＞glycol＞ DMSO＞PVA＞melamine.