扩链剂对PBAT/Talc复合材料性能影响研究

Effect of Chain Extender on the Properties of PBAT/Talc Composites

通过熔融共混制备可生物降解的聚对苯二甲酸己二酸丁二醇酯/滑石粉(PBAT/Talc)复合材料,探究滑石粉及扩链剂含量对PBAT/Talc复合材料力学性能、结晶性能、流变性能及微观形貌的影响。结果表明:随着滑石粉及扩链剂含量的增加,复合材料的屈服应力及拉伸模量逐渐增大,但断裂伸长率逐渐下降;当滑石粉及扩链剂含量分别为30%和0.6%时,PBAT/Talc复合材的拉伸强度最高为18.1 MPa,断裂伸长率为257%;随着扩链剂含量的增加,PBAT/Talc复合材料的熔点、结晶度及结晶温度逐渐降低,PBAT/Talc复合材料熔体的拉伸黏度逐渐增大;当扩链剂加入量为0.6%时,滑石粉在PBAT中的分散性最好,未观察到滑石粉团聚现象。

The biodegradable polybutylene adipate terephthalate/talcum powder(PBAT/Talc) composites were prepared by melt blending, and the effects of Talc and chain extender content on the mechanical properties, crystallization properties, rheological properties and micro morphology of PBAT/Talc composites were studied. The results show that the yield stress and tensile modulus of the composites gradually increase, but the elongation at break gradually decreases with the increase of Talc and chain extender content. When the content of Talc and chain extender is 30% and 0.6%respectively, the composites show the highest tensile strength of 18.1 MPa, the elongation at break of 257%. With the increase of the chain extender content, the melting point, crystallinity and crystallization temperature of the PBAT/Talc composites gradually decrease, and the tensile viscosity of the PBAT/Talc composites melt gradually increases. When the chain extender content is 0.6%, the dispersibility of talc in PBAT is the best, and talc agglomeration isn’t observed.