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Preparation and Properties of Hybrid Functionalized Carbon Nanotube Polyurethane Composites |
ZHU Mengqi1, XIAO Tan2, ZHENG Weiling1, WEI Baojuan1, WANG Yu2, WU Ping1 |
1. Science College, Shantou University, Shantou 515063
2. School of Engineering, Sun Yat–sen University, Guangzhou 510006 |
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Cite this article:
ZHU Mengqi XIAO Tan ZHENG Weiling WEI Baojuan WANG Yu WU Ping. Preparation and Properties of Hybrid Functionalized Carbon Nanotube Polyurethane Composites. Chin J Mater Res, 2012, 26(2): 191-198.
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Abstract Multi–walled carbon nanotubes (MWNTs) were modified with different approaches to produce carboxylated carbon nanotubes (MWNTs–COOH), covalently functionalized carbon nanotubes (MWNTs–NH2), noncovalently functionalized carbon nanotubes (MWNTs–PPA), and hybrid functionalized carbon nanotubes (MWNTs–COOH–PPA), respectively. These functionalized MWNTs were respectively incorporated into polyurethane (PU) with various mass fraction to prepare four kinds of PU composite. The mechanical and thermal properties of these composites were tested by means of universal testing machine and thermal gravimetric analyzer. The results show that by grafting few functional groups onto the MWNT surface to prevent the detachment of noncovalent wrapping, hybrid functionalization not only improves the dispersion of MWNTs in the matrix, but also retains the interfacial interactions between them. Therefore the best reinforcement is achieved. Addition of heat–resistant MWNTs increases the thermal deposition temperature of PU matrix, and the increase amount slightly varies with functionalization
approaches. MWNTs–COOH–PPA/PU has the best mechanical performance. Its tensile strength increased 104% compared with pure PU at 0.3% MWNTs loading. Its thermal decomposition temperature is identical to that of MWNTs–COOH/PU, better than that of pure PU, but lower than that of MWNTs–NH2/PU and MWNTs–PPA/PU.
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Received: 30 August 2011
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Fund: Supported by National Natural Science Foundation of China No. 10772102, Natural Science Foundation of Guangdong Province Nos. 07008103 and 9152841101000001, Reserve Key Project of Yat–sen University No.1132249, Talent Project of Sun Yat–sen University No. 3181304. |
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