Enhanced conductivity in polybenzoxazoles doped with carboxylated multi-walled carbon nanotubes
Enhanced conductivity in polybenzoxazoles doped with carboxylated multi-walled carbon nanotubes
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DOI：
10.1016/j.carbon.2008.05.005
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发表时间：
2008-08
期刊：
影响因子：
10.9
通讯作者：
Chengjun Zhou;Shanfeng Wang;Q. Zhuang;Zhe‐wen Han
中科院分区：
文献类型：
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作者：
Chengjun Zhou;Shanfeng Wang;Q. Zhuang;Zhe‐wen Han
两种具有代表性的聚苯并唑，聚（对苯撑苯并二恶唑）（PBO）和聚（2，5-苯并恶唑）（ABPBO），已被用作制备导电纳米复合膜的基体材料。在这种策略中，原始的多壁碳纳米管（MWCNT）首先用硝酸处理以形成羧基化的多壁碳纳米管（MWCNTs-COOH）。随后，MWCNTs-COOH有效地分散在甲磺酸（MSA）溶液的聚苯并唑，超声处理，然后加工成薄膜。MWCNTs-COOH在MSA中形成各向同性的制度，在浓度为10.1wt.%。纳米管可以在聚合物基体中形成网状结构和导电通道，以提高导电性、机械性能和热稳定性。在MWCNT-COOH组成为5 wt.%时，聚苯并唑/MWCNT-COOH复合膜的电导率从10 × 10− 12提高到1.6×10−4Scm− 1，提高了8个数量级，而光学透明性没有明显降低。
Two representative polybenzazoles, poly(p-phenylene benzobisoxazole) (PBO) and poly(2,5-benzoxazole) (ABPBO), have been used as matrix materials for fabricating electrically conducting nanocomposite films. In this strategy, pristine multi-walled carbon nanotubes (MWCNTs) were first treated with nitric acid to form carboxylated multi-walled carbon nanotubes (MWCNTs–COOH). Subsequently, MWCNTs–COOH were dispersed efficiently in the methanesulfonic acid (MSA) solution of polybenzazole, sonicated, and then processed into thin films. MWCNTs–COOH in MSA formed an isotropic regime at the concentration of ∼0.1wt.%. Nanotubes could form net like structures and conductive channels in the polymer matrix to improve electrical conductivity, mechanical properties, and thermal stability. At the MWCNT–COOH composition of 5wt.%, polybenzazole/MWCNT–COOH composite films exhibited a dramatic enhancement in electrical conductivity by 8 orders of magnitude from ∼10−12to 1.6×10−4Scm−1without significantly sacrificing optical transparency.