中文摘要：

通过微型双螺杆挤出机熔融共混制备了聚对苯二甲酸乙二醇酯（PET）/碳纳米管（CNT）复合材料.采用表面电阻仪、场发射扫描电镜（FESEM）和差示扫描量热仪（DSC）研究了多壁碳纳米管（MWNT）和羧基化多壁碳纳米管（MWNTGCOOH）对复合材料导电性能与结晶性能的影响.结果表明,当CNT含量〉1%（质量分数）时,CNT在PET中形成三维导电网络,复合材料具有抗静电和导电功能,MWNTGCOOH分散性好,与PET 有较强的界面结合和相互作用,复合材料的导电性优于PET/MWNT.复合材料的结晶放热峰温度大幅提高,比PET高40多℃,0.1% （质量分数）含量的CNT就有非常明显的异相成核与诱导结晶作用.同时,复合材料的结晶度增加,熔点略微升高.

英文摘要：

Polyethylene terephthalate (PET)/carbon nanotubes (CNT)nanocomposites were fabricated with a simple melt compounding method using a Mini-Lab twin-screw extruder.The effects of the raw and acid-modi-fied multi-walled carbon nanotubes (MWNT-COOH)on the conductive properties and crystallization behavior of PET nanocomposites were comparatively investigated by using surface resistance meter,field emission scan-ning electron microscope (FESEM)and differential scanning calorimeter (DSC).It was revealed that the nano-composites had antistatic and conductive functionality when the loading of CNT was more than 1wt%,which formed three-dimensional conductive networks.MWNT-COOH owing polar oxygen-containing groups on the surface was beneficial to combine with PET matrix and the uniform dispersion.Therefore,the conductive per-formance of PET/MWNT-COOH composites was better than that of PET/MWNT composites.Moreover,the crystallization temperatures of the nanocomposites were increased more than 40 ℃ compared with neat PET. Very obvious heterogeneous nucleation and induced crystallization effects could be achieved when the loading of CNT was only 0.1wt%.Meanwhile,the crystallinity of the nanocomposites was improved and the melting points were increased slightly.