采用溶液共混法,将不同质量分数的羧基化多壁碳纳米管(CMWNTs)加入聚己二酸己二胺(PA66)中,制得CMWNTs/PA66复合材料,对复合材料的结品及热性能进行了分析.结果表明:加入CMWNTs后,CMWNTs/PA66复合材料的熔点随着CMWNTs含量的增大基本不变,但是结晶度略有增大,结晶温度逐渐升高;CMWNTs对PA66结晶的晶型没有影响,偏光显微镜观测发现添加CMWNTs使晶粒尺寸减小,碳纳米管的异相成核剂作用明显.CMWNTs与PA66分子链之间主要是范德华力和氢键作用,未能证实两者之间存在化学键.添加CMWNTs使复合材料的开始分解温度和最大分解温度略有升高.碳纳米管对分解过程中产生的自由基的强烈吸附作用延缓了分解速率.
The solution mixing was used to fabricate a series of carboxylic multi- walled carbon nanotubes (CMWNTs) / poly(adipic acid- hexamethylene diamine) (PA66) composites. The thermal and crystallizing properties of the composites were characterized by the thermogravimetric analysis (TG), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and polarizering microscope (POM). It is found that as the content of CMWNTs increases, the melting temperatures of the composites are almost unchanged, and the crystallinity and crystallizing temperature increase. CMWNTs act as a heterogeneous nucleation agent and do not affect the crystal form. POM analysis shows that addition of CMWNTs reduces the grain size of PA66. The interaction between CMWNTs and PA66 molecular chain is mainly Van Der Waals force and hydrogen bond. No evidence is given to prove the existence of chemical bonds between CMWNTs and PA66 molecular chains. The decomposition temperature of the composites rises slightly, The strong absorption of CMWNTs to the free radicals formed in the decomposition process decreases the rate of the composite decomposition.
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