Hydroxyl‐phosphazene‐wrapped carbon nanotubes and its application in ethylene‐vinyl acetate copolymer
Hydroxyl‐phosphazene‐wrapped carbon nanotubes and its application in ethylene‐vinyl acetate copolymer
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DOI：
10.1002/app.39706
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发表时间：
2013-12
影响因子：
3
通讯作者：
Tao Zhang;Z. Du;W. Zou;Hangquan Li;Chen Zhang
中科院分区：
文献类型：
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作者：
Tao Zhang;Z. Du;W. Zou;Hangquan Li;Chen Zhang
以多壁碳纳米管（MWNTs）为原料，通过熔融共混法将羟基改性磷腈接枝到乙烯-醋酸乙烯酯（伊娃）共聚物中，形成一种新型的阻燃结构。利用傅里叶变换红外光谱和透射电子显微镜对磷腈包裹的多壁碳纳米管的结构和形貌进行了表征。接枝磷腈在碳纳米管表面引入含磷和含氮物种，从而改善了伊娃树脂的热稳定性和碳纳米管在伊娃基体中的分散性。热重分析和锥形量热分析表明，磷腈和多壁碳纳米管对提高伊娃的热稳定性和阻燃性有协同作用。此外，SEM观察表明，磷腈促进了碳纳米管表面残炭的形成。炭残留物填充了多壁碳纳米管网络结构中的空间，并将多壁碳纳米管粘合在一起。致密的炭/MWNTs层构成热和质量块，因此观察到更好的阻燃性。© 2013 Wiley Periodicals，Inc. J.应用聚合物Sci. 130：4245-4254，2013
Multiwalled carbon nanotubes (MWNTs) are covalently grafted with hydroxyl modified phosphazene, which constitutes a novel flame retardant structure, and introduced into ethylene-vinyl acetate (EVA) copolymer via melt blending. The structure and morphology of the phosphazene-wrapped MWNTs are characterized using Fourier transform infrared spectroscopy and transmission electron microscopy. The grafted phosphazene introduces phosphorus- and nitrogen-containing species onto the surface of MWNTs and thus improves thermal stability of EVA resin and the dispersion of MWNTs in EVA matrix. Thermogravimetric analysis and cone calorimeter analysis reveal that phosphazene and MWNTs produce a synergistic effect on the enhancement of the thermal stability and flame retardancy of EVA. Furthermore, SEM observation indicates that phosphazene accelerates the formation of char residue on the surface of MWNTs. The char residue fills the space in the network structure of MWNTs and glues the MWNTs together. The dense char/MWNTs layers constitute a heat and mass block and therefore a better flame retardancy is observed. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4245–4254, 2013