以疏水性的醋酸酯淀粉为基材,壳聚糖为抗菌剂制备了醋酸酯淀粉抗菌材料。通过考察醋酸酯淀粉取代度对壳聚糖分散性、材料力学性质、热性质和抗菌活性的影响,发现醋酸酯淀粉的取代度由1.9增加到2.9,抗菌材料表面和断面越均一,壳聚糖的分散性越好;但高取代度会削弱淀粉分子与壳聚糖分子间的相互作用力,使抗菌材料的断裂伸长率由33.7%降低至8.9%,玻璃化转变温度由74.8℃升高至86.4℃,拉伸模量由205 MPa增至260 MPa。同时过高的取代度又会影响壳聚糖的溶出,降低材料的抗菌活性。
The acetate-starch/chitosan blended antimicrobial material was prepared,and the influences of starch＇s degree of substitution（DS） on mechanical properties,thermal properties and antimicrobial properties of materials were studied.The results show that the high DS（DS=1.9 to DS =2.9） makes materials more homogeneous,but impairs the interaction between starch molecules and chitosan molecules,resulting in lower elongation（from 33.7% to 8.9%）,higher tensile modulus（from 205 MPa to 260 MPa） and Tg（from 74.8 ℃ to 6.4 ℃）.Besides,the high DS also discourages chitosan to dissolve in water,which means that the antimicrobial activity is weakened.
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