Acta Chim. Sinica ›› 2018, Vol. 76 ›› Issue (6): 453-459.DOI: 10.6023/A18030090 Previous Articles     Next Articles



朱明晶, 彭娟, 唐萍, 邱枫   

  1. 聚合物分子工程国家重点实验室 复旦大学高分子科学系 上海 200433
  • 投稿日期:2018-03-06 发布日期:2018-04-20
  • 通讯作者: 彭娟,;Tel:021-65643498
  • 基金资助:


Preparation and Characterization of Highly Stable and Aqueous Dispersion of Conjugated Polyelectrolyte/Single-Walled Carbon Nanotube Nanocomposites

Zhu Mingjing, Peng Juan, Tang Ping, Qiu Feng   

  1. State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
  • Received:2018-03-06 Published:2018-04-20
  • Contact: 10.6023/A18030090
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 21674024, 21274029, 21320102005) and Ministry of Science and Technology of China (No. 2016YFA0203301).

The dispersion of single-walled carbon nanotubes (SWNTs) is a key point to develop their extensive applications. Especially, to meet the requirements of future green chemistry, the preparation of environmentally-friendly, highly stable and well-distributed SWNTs in aqueous solution becomes particularly important. Based on it, a water-soluble conjugated polyelectrolyte, namely poly[3-[6-(N-methylimidazolium)hexyl]thiophene] (P3MHT) was designed and used to disperse SWNTs through non-covalent strategy. P3MHT was synthesized by a modified Grignard metathesis (GRIM) polymerization followed by quaternization of the bromohexyl side groups of the poly[3-(6-bromohexyl)thiophene] with N-methylimidazole. The P3MHT/SWNTs nanocomposites were prepared by mixing P3MHT and SWNTs in water during ultrasonication followed by centrifugation. UV-vis absorption spectroscopy, photoluminescence (PL) spectroscopy, transmission electron microscope (TEM), Zeta-nano electric potential analyzer, thermogravimetric (TGA) analysis were applied to characterize P3MHT/SWNTs nanocomposites. Compared to the commercial sodium dodecyl sulfate (SDS) surfactant to disperse SWNTs in aqueous solution, P3MHT exhibited a much better ability to disperse SWNTs under the same condition, i.e., the concentration of SWNTs dispersed by P3MHT was about two times than that of SWNTs dispersed by SDS. In P3MHT/SWNTs nanocomposite solution, SWNTs were exfoliated to form individuals or small bundles with an average size of 298 nm. However, in SDS/SWNTs solution, SWNTs preferred to form small aggregates with an average size of more than 500 nm. The P3MHT backbones were wrapped around individual SWNTs via π-π interactions to form the charge-transfer complexes. The ionic side chains of P3MHT not only made the nanocomposites dispersed in water, but also prevented the aggregation of SWNTs by electrostatic repulsion, resulting in aqueous dispersion of P3MHT/SWNTs nanocomposites. While SDS molecules were adsorbed on the surface of SWNTs via hydrophobic alkyl chains, which was much weaker than the π-π interactions between P3MHT and SWNTs. Such P3MHT/SWNTs nanocomposite solution exhibited high stability which remained almost unchanged after 6 months while SDS/SWNTs nanocomposite had already precipitated then. Overall, it provides a promising and simple method to develop highly stable and water processed SWNTs.

Key words: conjugated polyelectrolytes, single-walled carbon nanotubes (SWNTs), aqueous dispersion, stability