Preparation and Properties of Carbon Nanotubes/Polybutylene Succinate Composites
ZHANG Qifeng1, WANG Zhong1, JIA Shikui1,2, ZHAO Zhongguo1, CAO Le1, CHEN Ligui1
1 School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China 2 School of Science, Xi’an Jiaotong University, Xi’an 710049, China
Abstract: Polybutylene succinate (PBS) was as a matrix material, and carbon nanotubes (CNTs) was as a reinforcing materials. Through wet processing technology, surface modified of carboxylated carbon nanotube (CNTs-COOH) with silane coupling agent KH570 and polyvinyl pyrrolidone(PVP) were successfully obtained, and then the different kinds of CNTs and PBS were prepared by melt blending using twin-screw extruder. The interfacial compatibility, thermal properties, crystallization properties and mechanical properties of the composites were investigated by SEM, WAXD, DSC, POM, TG and universal testing machines and cantilever beam impact testing machine. The results showed: compared with pure PBS, the agglomeration of CNTs/PBS composites was obvious, and their crystallinity, tensile strength, impact strength and flexural strength were increased by 7.77%, 3.1%, 13.2% and 15.8%, and elongation at break was decreased by 14.2%. After modification, the performance of CNTs-COOH-KH570/PBS composites was better than that of CNTs-COOH-PVP/PBS composites. The dispersion morphology of CNTs-COOH-KH570/PBS composites was improved, and the crystallinity, tensile strength, impact strength and flexural strength were increased by 12.23%, 11.8%, 25.8% and 24.3%, and elongation at break was decreased by 8.1%, compared with PBS. Meanwhile, the thermal stability of PBS composites showed slightly increase with the introduction of CNTs. Moreover,compared with pure PBS, the volume resistivity of CNTs/PBS composites decreased by 56.6%, and the conductivity increased by one order of magnitude, while, the volume resistivity of CNTs-COOH, CNTs-COOH-KH570 and CNTs-COOH-PVP modified PBS composites decreased by 59.8%, 60.9% and 62.5%, respectively. And, compared with pure PBS, the electrical conductivity for all of PBS-based composites modified with surface treated CNTs increased by one order of magnitude.
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2020, Vol. 34 
