Structure and crystallization behavior of Nylon 66/multi-walled carbon nanotube nanocomposites at low carbon nanotube contents

被引:291
作者
Li, Lingyu
Li, Christopher Y. [1 ]
Ni, Chaoying
Rong, Lixia
Hsiao, Benjamin
机构
[1] Drexel Univ, AJ Drexel Nanotechnol Inst, Philadelphia, PA 19104 USA
[2] Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA
[3] Univ Delaware, Wm Keck Electron Microscopy Facil, Dept Mat Sci & Engn, Newark, DE 19716 USA
[4] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA
基金
美国国家科学基金会;
关键词
polymer nanocomposites; carbon nanombe; polymer crystallization;
D O I
10.1016/j.polymer.2007.04.030
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Multi-walled carbon nanotubes (MWNTs) were modified with poly(hexamethylene adipamide) (also known as Nylon 66) via a controlled polymer solution crystallization method. A "nanohybrid shish kebab" (NHSK) structure was found wherein the MWNT resembled the shish while Nylon 66 lamellar crystals formed the kebabs. These Nylon 66-functionalized MWNTs were used as precursors to prepare polymer/MWNT nanocomposites. Excellent dispersion was revealed by optical and electron microscopies. Nitric acid etching of the nanocomposites showed that MWNT formed a robust network in Nylon 66. Non-isothermal DSC results showed multiple melting peaks, which can be attributed to lamellar thickness changes upon heating. The crystallite sizes L-100 and L-010 of Nylon 66, determined by WARD, decreased with increasing MWNT contents. Isothermal DSC results showed that crystallization kinetics increased first and then decreased with increasing MWNT contents in Nylon 66. This study showed that the effect of MWNTs on Nylon 66 crystallization is twofold: MWNTs provide heterogeneous nucleation sites for Nylon 66 crystallization while the tube network structure hinders large crystal growth. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:3452 / 3460
页数:9
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