Mao Zhiqing, Wu Wei, Cheng Yuan, Xie Chen, Zhang Dunming, Jiang Xiqun
Laboratory of Mesoscopic Chemistry and Department of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China.
J Nanosci Nanotechnol. 2011 Jun;11(6):5169-78. doi: 10.1166/jnn.2011.4178.
Multi-walled carbon nanotubes (MWNTs) were modified covalently with hydrophilic polyacrylic acid (PAA) oligomer. Fourier transform infrared (FTIR), thermogravimetric (TG) analysis, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to characterize the modified MWNTs. The solubility of the modified MWNTs in water was determined to be 55.6 mg/mL by UV/vis spectroscopy. They could be dispersed homogeneously in water-borne epoxy resin and improve the mechanical properties of the resin significantly. The reinforcing ability of the modified MWNTs should be contributed by the fine dispersion of the MWNTs in resin matrix and the robust covalent binding formed by the carbon nanotube-bound carboxylic acid and epoxy groups in the resin.
多壁碳纳米管（MWNTs）通过与亲水性聚丙烯酸（PAA）低聚物进行共价修饰。采用傅里叶变换红外光谱（FTIR）、热重分析（TG）、透射电子显微镜（TEM）和扫描电子显微镜（SEM）对修饰后的多壁碳纳米管进行表征。通过紫外/可见光谱法测定修饰后的多壁碳纳米管在水中的溶解度为55.6 mg/mL。它们可以均匀地分散在水性环氧树脂中，并显著提高树脂的机械性能。修饰后的多壁碳纳米管的增强能力应归因于其在树脂基体中的良好分散以及碳纳米管结合的羧酸与树脂中的环氧基团形成的牢固共价键。
