取向PAN/MWCNTs与热塑性聚烯烃复合材料的制备及表征

利用静电纺丝并借助高速旋转的滚筒和热牵引作用制备不同取向度的聚丙烯腈/碳纳米管（PAN/MWCNTs）纳米纤维膜，通过高速滚筒和热牵引提高PAN的结晶度从而提高材料的拉伸强度和弹性模量，但会降低断裂伸长率；MWCNTs含量为0.5 %（质量分数，下同）时PAN/MWCNTs力学性能最佳。利用浸渍法将各种取向度的PAN/MWCNTs纳米纤维膜与热塑性弹性体（POE）制备成一系列POE/PAN/MWCNTs复合材料（POE/PM）。结果表明，高取向度POE/h?P2M复合材料的拉伸强度比不取向POE/u?PME复合材料高71 %，拉伸强度显著提高，断裂伸长率则减小，PAN/MWCNTs纳米纤维膜含量为6.7 %时，复合材料的力学性能最佳。

Preparation and characterization of oriented thermoplastic polyolefin/PAN/ MWCNT composites

A series of polyacrylonitrile （PAN）/carbon nanotube （MWCNT） nanofiber membranes with different orientation degrees were prepared through electrospinning using a high?speed rotating roller and thermal post?treatment. This process resulted in an improvement in the crystallinity of PAN， thus improving the tensile strength and elastic modulus of the nanofiber membranes and decreasing their elongation at break. The PAN/MWCNT nanofiber membranes exhibited optimal mechanical properties at an MWCNT content of 0.5 wt%. A series of thermoplastic polyolefin （POE） composi?tes with the PAN/MWCNT nanofiber membranes at different orientation degrees were prepared using an immersion method. The POE/h?P2M composite with a high orientation degree showed an increase in tensile strength by 71% compared to the POE/u?PM composite without orientation， but its elongation at break decreased. The composites exhibited optimal mechanical performance at a nanofiber?membrane content of 6.7 wt%.