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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and Properties of Homogeneously Dispersed Polyamide 6/MWNTs Nanocomposites via Simultaneous In Situ Anionic Ring-Opening Polymerization and Compatibilization
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Synthesis and Properties of Homogeneously Dispersed Polyamide 6/MWNTs Nanocomposites via Simultaneous In Situ Anionic Ring-Opening Polymerization and Compatibilization

机译：同时原位阴离子开环聚合与相容化制备均相分散聚酰胺6 / MWNTs纳米复合材料及其性能

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摘要

Toluene 2, 4-diisocyanate (TDI) functionalized multiwalled carbon nanotubes (MWNTs-NCO) were used to prepare monomer casting polyamide 6 (MCPA6)/ MWNTs nanocomposites via in situ anionic ring-opening polymerization (AROP). Isocyanate groups of MWNTs- NCO could serve as AROP activators of e-caprolactam (CL) in the in situ polymerization. Fourier transform infrared (FTIR) showed that a graft copolymer of PA6 and MWNTs was formed in the in situ polymerization. MWNTs-PA6 covalent bonds of the graft copolymer constituted a strong type of interfacial interaction in the nanocomposites and increased the compatibility of MWNTs and MCPA6 matrix. The nanocomposites were characterized for the morphology, mechanical, crystallization, and thermal properties through field emission transmission electron microscopy (FETEM), tensile testing, differential scanning calorimeter (DSC), and thermogravimetric analysis (TGA). FETEM analysis showed that MWNTs were homogeneously dispersed in MCPA6 matrix. The initial tensile strengths and tensile modulus of the nanocomposite with 1.5 wt % loading of MWNTs were enhanced by about 16 and 13%, respectively, compared with the corresponding values for neat MCPA6. DSC analysis indicated that the crystallization temperature of the nanocomposites was increased by 8 C by adding 1.5 wt % MWNTs compared with pure MCPA6. Besides, it was found that the thermal stability of MCPA6 was improved by the addition of the MWNTs.
机译：甲苯2，4-二异氰酸酯（TDI）功能化的多壁碳纳米管（MWNTs-NCO）用于通过原位阴离子开环聚合（AROP）制备单体浇铸聚酰胺6（MCPA6）/ MWNTs纳米复合材料。 MWNTs-NCO的异氰酸酯基团可以在原位聚合反应中用作ε-己内酰胺（CL）的AROP活化剂。傅里叶变换红外光谱（FTIR）表明，在原位聚合反应中形成了PA6和MWNTs的接枝共聚物。接枝共聚物的MWNTs-PA6共价键构成了纳米复合材料中的一种强界面相互作用，并增加了MWNTs与MCPA6基质的相容性。通过场发射透射电子显微镜（FETEM），拉伸测试，差示扫描量热仪（DSC）和热重分析（TGA）对纳米复合材料的形貌，机械，结晶和热性能进行了表征。 FETEM分析表明，MWNTs均匀分散在MCPA6基质中。与纯MCPA6的相应值相比，具有1.5重量％的MWNTs负载的纳米复合材料的初始拉伸强度和拉伸模量分别提高了约16％和13％。 DSC分析表明，与纯MCPA6相比，通过添加1.5wt％的MWNT，纳米复合材料的结晶温度提高了8℃。此外，发现通过添加MWNT提高了MCPA6的热稳定性。

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