聚丁二酸丁二酯/聚(3-羟基丁酸酯-co-4-羟基丁酸酯)/纳米高岭土熔融共混力学性能、流变及降解行为研究

摘要

用熔融共混挤出法制备的聚丁二酸丁二酯(PBS)/聚(3-羟基丁酸酯co-4-羟基丁酸酯)[poly (3 HB-co-4 HB)]/纳米高岭土(nano Kaolin)复合降解材料；利用万能拉力机、旋转流变仪和SEM对其力学性能、流变行为、微观结构及降解性能进行研究.结果表明,PBS/poly(3HB co-4HB)ano Kaolin(100/10/8)复合降解材料的缺口冲击强度、断裂伸长率达到最大,此后随着nano Kaolin质量百分比增加,而呈下降趋势；在室外自然条件下,经过土埋一段时间后的降解实验,PBS/poly(3 HB-co-4 HB)ano Kaolin(100/10/12)复合材料发生了明显的降解,复合降解材料的失重率也已经降到64％左右,说明材料的降解性能较好；纳米复合降解材料熔融剪切储能模量(G＇),剪切损耗模量(G")随着频率的增大呈单增趋势.%In order to improve the combinatorial performance of poly ( butylenes succinate) (PBS)/poly (3-hydroxybutyrate-co-4-hydroxybutyrate)(poly(3HB-co-4HB)) like the mechanical properties and rheological be-haviors, PBS/poly(3HB-co-4HB)ano Kaolin blends were prepared by mechanically melting mixing. The me-chanical and degradation properties and rheological behaviors of the PBS/poly(3HB-co-4HB)ano Kaolin were studied respectively with universal material testing machine, rheometer and scanning electron microscope (SEM). The mechanical properties testing of universal material testing machine shown that the relative mass ratio of nano Kaolin was 8, the notched impact strength and elongation at break of PBS/poly (3HB-co-4HB)/ nano Kaolin blends were improved obviously. However,the relative mass ratio of nano Kaolin increased, their properties decreased in a way. At the same time, the tensile strengths of PBS/poly (3HB-co-4HB)ano Kaolin blends were declined clearly. The rheology experiments indicated the storage modulus (G') and loss modulus (G") increased significantly with the increase of frequency. The SEM shown that degradation performances of PBS/poly (3HB-co-4HB)ano Kaolin (100/10/12) were favorable.