PBAT的扩链反应及其微孔发泡行为研究

Study on Chain Extension and Microcellular Foaming Behaviors of Poly(butyleneadipate-co-terephthlate)

以己二酸丁二醇酯-对苯二甲酸丁二醇酯(PBAT)共聚物为基体,加入不同含量的扩链剂,经熔融共混后,制备扩链PBAT。结果表明,随着扩链剂含量的增加,熔融混合的扭矩值、凝胶含量和结晶温度逐渐升高,熔融温度基本不变,结晶度下降,黏弹性得到改善;以超临界CO_2为物理发泡剂,通过间歇式釜压发泡法制备微孔PBAT泡沫,随着扩链剂含量的增多,发泡样品的泡孔尺寸变小,泡孔密度逐渐增加,当扩链剂的份数为0.8时,泡孔尺寸为4.4μm,泡孔密度为1.65×10~10个/cm^3。

The chain-extended poly(butyleneadipate-co-terephthlate)(PBAT)was prepared by use of different amounts of chain extender through reactive melt blending.An investigation indicated that the torque,gel fraction and crystallization temperature of chain-extended PBAT were improved with an increase of weight fraction of chain extender.However,its melting temperature kept stable,followed by a modification of viscosity,whereas its degree of crystallinity decreased.The micro-foaming PBAT materials were prepared by using supercritical CO 2 as a physical foaming agent.The structural characterizations and performance evaluation indicated that the cell size of PBAT foams decreased with an increase in weight fraction of chain extender,but their cell density was improved.When the weight fraction of chain extender was set as 0.8,the PBAT foams achieved a cell size of 4.4μm and a cell density of 1.65×10 10 cells/cm 3.