改性CNTs对PBS结晶及力学性能的影响

Influence of Modified Carbon Nanotubes on Crystallization and Mechanical Properties of PBS

以聚丁二酸丁二酯(PBS)为基体,碳纳米管(CNTs)、钛酸脂偶联剂改性羧基化碳纳米管(CNTs-COOH-m)为增强材料,利用双螺杆挤出机熔融共混制备一系列PBS/CNTs复合材料。采用扫描电子显微镜、广角X射线衍射仪、差示扫描量热仪、偏光显微镜、热重分析仪和万能试验机及悬臂梁冲击试验机对复合材料的界面相容性、结晶和力学性能进行测试。结果表明,与纯PBS相比,当CNTs质量分数为0.9%时,PBS/CNTs复合材料团聚现象明显,其结晶度提高了16.0%,初始分解温度提高了2℃,而相对应的PBS/CNTs-COOH-m复合材料团聚现象得到明显的改善,其结晶度提高了20.1%,初始分解温度提高了6℃;当CNTs的质量分数为1.2%时,PBS/CNTs-COOH-m的力学性能更为优异,其拉伸强度、冲击强度分别较纯PBS提高了7.8%和17.8%。

Using polybutylene succinate (PBS) as the matrix,carbon nanotubes (CNTs) and carboxylated carbon nanotubes treated with titanate coupling agent (CNTs-COOH-m) as reinforcing materials,a series of PBS/CNTs composites were prepared by melt blending using twin-screw extruder. The interfacial compatibility,crystallization and mechanical properties of the composites were tested by scanning electron microscope,wide-angle X-ray diffractometer,differential scanning calorimeter,polarized light microscope,thermogravimetric analyzer,universal testing machine and cantilever beam impact testing machine. The results show that when the mass fraction of CNTs was 0.9%,the agglomeration of PBS/CNTs composites is obvious,the crystallinity is increased by 16.0%,and the initial decomposition temperature is increased by 2℃. While the agglomeration phenomenon of PBS /CNTs-COOH-m composite is significantly improved,its crystallinity is increased by 20.1%,and the initial decomposition temperature is increased by 6℃. When the mass fraction of CNTs is 1.2%,the mechanical properties of PBS/CNTs-COOH-m composites are the optimistic,and the tensile strength and impact strength are 7.8% and 17.8% higher than those of pure PBS.