聚酰胺66/氨基化多壁碳纳米管纤维制备及其性能

为提高聚酰胺66(PA66)纤维的力学性能,将羧基化碳纳米管(CMWNTs)与乙二胺(EA)进行功能化反应得到氨基化碳纳米管(AMWNTs),再将AMWNTs与PA66盐原位聚合制备AMWNTs掺杂PA66材料(PACNTs),并通过熔融纺丝制备成纤维。采用热重分析仪、差示扫描量热仪、X射线衍射仪及单纤维强力仪等对PA66和PACNTs纤维进行结构和性能表征。结果表明:PACNTs纤维的熔点随着AMWNTs的加入向低温方向移动,AMWNTs的加入使PA66分子质量下降,PACNTs纤维的结晶温度向高温方向移动,AMWNTs起到异相成核作用;随着AMWNTs的加入,PACNTs纤维的拉伸强度和弹性模量增加,当AMWNTs质量分数为0.5%时,PACNTs纤维的拉伸强度和弹性模量达到最大,比纯PA66纤维分别提高了约157%和455%。

Preparation and properties of polyamide 66/amino-functionalized multi-walled carbon nanotubes fibers

In order to improve the mechanical properties of polyamide 66 (PA66) fiber, carboxylated multi-walled carbon nanotubes (CMWNTs) were condensed with ethylenediamine (EA) to obtain amino-functionalized multi-walled carbon nanotubes (AMWNTs), and AMWNTs doped PA66 composites (PACNTs) were prepared by in-situ polymerizing AMWNTs with polyamide 66 salt. Furthermore, the composites were melt-spun into fibers. The fibers were characterized using thermogravimetry, differential scanning calorimeter, X-ray diffraction and single fiber strength tester. The results show that, the melting temperature of the PACNTs fiber moves toward the low temperature direction as the content of AMWNTs increases, the addition of AMWNTs lowers the molecular weight of PA66, and the crystallization temperature of the PACNTs fiber moves toward the high temperature direction as a result of AMWNTs acting as a heterogeneous nucleation agent. The tensile strength and elastic modulus of the PACNTs fiber increase with increasing the content of AMWNTs. The tensile strength and elastic modulus of PACNTs fiber reach the maximum when the mass fraction of AMWNTs is 0.5%, which increase by approximately 157% and 455% as compared with those of PA66, respectively.