原位复合法制备多壁碳纳米管/聚对苯二甲酸乙二酯复合物

In Situ Polymerization as an Approach to Prepare Multiwalled Carbon Nanotubes/poly(ethylene terephthalate) Nanocomposites

采用原位复合方法,合成了不同多壁碳纳米管(MWNTs)含量的PET纳米复合物。实验中采用超声波辅助(方法A)和球磨辅助(方法B)两种分散方法。用扫描电子显微镜(SEM)、差示扫描量热分析(DSC)、Instron拉伸实验等手段对MWNTs及其在PET基质中的形态、复合物的熔融和结晶行为以及物理机械性能进行了表征。结果表明:MWNTs能够均匀分散于PET中,且长径比较小的MWNTs的分散程度更好一些。聚合物熔体结晶过程中,MWNTs具有明显的成核作用,最大可使熔融结晶温度提高24.1℃。与纯PET材料相比,含0.4%MWNTs的PET复合材料(A-PET-4)的拉伸强度和杨氏模量分别提高约17%和25%,断裂伸长率则大幅度降低。

Multi-walled carbon nanotubes/poly（ethylene terephthalate） （MWNTs/PET） with different MWNTs loadings had been prepared via in situ polymerization of ethylene glycol containing dispersed MWNTs and terephthalic acid. Ultrasonication-assited dispersion method（A） and ball-milling-assited dispersion method （B） were adopted to disperse MWNTs in EG, then in resultant PET. Scanning electronic microscopy （SEM）, differential scanning calorimetry（DSC） and Instron tensile testing were utilized to characterize the morphol- o：gy, crystallization and mechanical properties respectively. Good dispersion of MWNTs in PET nanocom- posites was achieved, especially by using method B. The incorporation of MWNTs accelerated the crystal- lization process obviously, the melt crystallizes temperature increased up to 24.1 ~C. Compared to neat PET, the elastic modulus （Young＇s modulus） and the yield strength of the PET nanocomposites were improved by about 25 % and 17 % respectively, with incorporating only 0.4 % MWNTs in method A.