Zhao Wen-Feng, Liu Ji-Xin, Cui Zhen-Kai, Hu Wu-Quan, Jiang Jian, Da Shi-Jun, Li Rong
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, PR China.
J Nanosci Nanotechnol. 2011 Jun;11(6):5018-23. doi: 10.1166/jnn.2011.4135.
A series of nanocomposites containing multi-walled carbon nanotubes (MWNTs) and terephthaloyl-di-p-oxybenzoyl chloride-triethylene glycol copolyester (T-T) were prepared by in-situ high-temperature solution polycondensation. The liquid crystalline properties and thermal stability of the resulted MWNTs/T-T nanocomposites were investigated by wide-angle X-ray diffraction (WAXD), polarized optical microscopy (POM), differential scanning calorimetry (DSC), and thermogravimetric analyzer (TGA), respectively. The results showed that MWNT doping at a low concentration improved the thermal stability of T-T matrix and expanded the nematic temperature range without largely changing its conformation, making it more suitable for processing. The dispersion of MWNTs and interfacial interactions between the thermotropic liquid crystalline polymer (TLCP) molecules and the carbon nanotubes (CNTs) were investigated by scanning electron microscopy (SEM) and optical spectroscopies. The UV-vis spectroscopy and fluorescence spectra supported a strong pi-pi* interaction between the polymer and the nanotube.
通过原位高温溶液缩聚法制备了一系列包含多壁碳纳米管（MWNTs）和对苯二甲酰 - 对氧基苯甲酰氯 - 三甘醇共聚酯（T-T）的纳米复合材料。分别通过广角X射线衍射（WAXD）、偏光显微镜（POM）、差示扫描量热法（DSC）和热重分析仪（TGA）研究了所得MWNTs/T-T纳米复合材料的液晶性能和热稳定性。结果表明，低浓度的MWNT掺杂提高了T-T基体的热稳定性，拓宽了向列相温度范围，且其构象变化不大，使其更适合加工。通过扫描电子显微镜（SEM）和光谱学研究了MWNTs的分散情况以及热致液晶聚合物（TLCP）分子与碳纳米管（CNTs）之间的界面相互作用。紫外 - 可见光谱和荧光光谱证实了聚合物与纳米管之间存在强烈的π-π*相互作用。
