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Tailored SWCNT functionalization optimized for compatibility with epoxy matrices

机译：量身定制的SWCNT功能化经过优化，可与环氧基质相容

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摘要

We have modified single walled carbon nanotubes (SWCNTs) with well defined matrix-based architectures to improve interface interaction in SWCNT/epoxy composites. The hardener and two pre-synthesized oligomers containing epoxy and hardener moieties were covalently attached to the SWCNT walls by insitu diazonium or carboxylic coupling reactions. In this way, SWCNTs bearing amine or epoxide-terminated fragments of different molecular weights, which resemble the chemical structure of the cured resin, were synthesized. A combination of characterization techniques such as Raman and infrared absorption (FTIR) spectroscopy, elemental analysis and coupled thermogravimetry-FTIR spectroscopy were used to identify both the functional groups and degree of functionalization of SWCNTs synthesized by the laser ablation and arc-discharge methods. Depending on the type of reaction employed for the chemical functionalization and the molecular weight of the attached fragment, it was possible to control the degree of functionalization and the electronic properties of the functionalized SWCNTs. Improved dispersion of SWCNTs in the epoxy matrix was achieved by direct integration without using solvents, as observed from optical microscopy and rheology measurements of the SWCNT/epoxy mixtures. Composite materials using these fillers are expected to exhibit improved properties while preserving the thermosetting architecture.
机译：我们已经使用定义明确的基于矩阵的体系结构修改了单壁碳纳米管（SWCNT），以改善SWCNT /环氧树脂复合材料中的界面相互作用。通过原位重氮或羧基偶联反应将硬化剂和两个包含环氧和硬化剂部分的预合成低聚物共价连接到SWCNT壁上。以此方式，合成了具有不同分子量的胺或环氧基封端的片段的SWCNT，其类似于固化树脂的化学结构。通过结合拉曼光谱和红外吸收（FTIR）光谱，元素分析和热重分析-FTIR光谱等表征技术，鉴定了通过激光烧蚀和电弧放电方法合成的SWCNT的官能团和官能化程度。取决于用于化学官能化的反应类型和所连接片段的分子量，可以控制官能化的SWCNT的官能化程度和电子性质。从SWCNT /环氧树脂混合物的光学显微镜和流变学测量中观察到，通过不使用溶剂的直接积分，实现了SWCNT在环氧基质中的改善的分散。期望使用这些填料的复合材料在保持热固性结构的同时显示出改善的性能。

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