聚丁二酸丁二醇酯滑石粉填充改性研究

The Modification of PBS by Talc Filling

目的研究滑石粉填充改性对聚丁二酸丁二醇酯(PBS)力学性能、热稳定性与结晶性能等的影响。方法将滑石粉经过钛酸酯偶联剂表面改性后,通过双螺杆挤出机将不同份数的改性滑石粉填充到PBS基体中挤出改性。结果当滑石粉质量分数分别小于15%时,其对复合材料的拉伸强度与断裂伸长率的影响并不显著。热失重分析表明,滑石粉质量分数为5%~10%时,PBS复合材料的热稳定性得到显著提高,热分解温度由纯料的357℃增加至372℃。X射线衍射图谱表明滑石粉的加入并没有改变PBS的晶型,仅给晶胞参数带来一些微小的改变。电镜结果表明,在质量分数15%以下时,滑石粉在PBS基体中具有较为均一的分布,但是这种均一的分布会随着滑石粉质量分数的增加而逐渐变差。结论随着滑石粉质量分数的增加,复合材料的硬度逐渐增强,结晶度逐渐下降。钛酸酯偶联剂的加入能够提升复合材料的界面粘合力并给材料带来了良好的力学性能。此外,PBS/滑石粉复合材料的热稳定性与滑石粉在PBS基体中的分布状态有着密切联系。

The work aims to investigate the effect of talc filling modification on mechanical property, thermal stability, crystallization property of Poly butylene succinate（PBS）. The talc was surface-modified by titanate coupling agent. Different amounts of modified talc were filled into the PBS matrix and extruded by a twin-screw extruder for modification. When the mass fractions of talc were respectively less than 15%, it had no remarkable impact on the tensile strength and elongation at break of the composites. TG analysis indicated that, the thermal stability of PBS composites was improved notably when the mass fraction of talc was 5%-10% and the thermal decomposition temperature increased from 357 to 372 ℃ ℃. The results of XRD demonstrated that the incorporation of talc did not change the PBS crystal form, but changed the cell parameters a bit. SEM studies indicated that, when the mass fraction was below 15%, the talc was of homogeneous dispersion in the PBS matrix; however, such homogeneous dispersion would gradually become worse with the increase of talc mass fraction. The stiffness of the composites is increased and the crystallinity is decreased linearly with the increasing talc mass fraction. The addition of titanate coupling agent can enhance the interfacial adhesion of the composites and produce fine mechanical properties. In addition, the thermal stability of PBS/talc composites is closely related to the distribution of talc in PBS matrix.