Study on Dispersion Properties of Multi⁃walled Carbon Nanotubes in Polyurethane⁃Based Coating Materials

doi:10.19491/j.issn.1001-9278.2021.07.003

Abstract

Abstract:

Multi?walled carbon nanotubes （MWCNTs） were treated with mixed acid to obtain functionalized MWCNTs （O?MWCNTs） with reactive groups. Polyethylene glycol （PEG1000） and isophorone diisocyanate （IPDI） were used as main raw materials to produce polyurethane （PU） prepolymer， and then the MWCNTs/ PU and PU/O?MWCNTs composite materials were prepared through an in?situ composite method. The microstructure， surface morphology and dispersion performance of MWCNTs and O?MWCNTs were investigated using TEM， SEM， XPS and FTIR. The structure characteristics of PU/MWCNTs and PU/O?MWCNTs composites as well as pure PU were characterized by use of FTIR. The results indicated that the treatment with mixed acid introduced 10.2 % of oxygen?containing functional groups into the sidewalls of MWCNTs. This greatly improves the dispersibility of MWCNTs in the polyurethane matrix. When O?MWCNTs was added with the formation of prepolymers， O?MWCNTs could be grafted into the PU chains. This may facilitate the dispersion more effectively. The PU/O?MWCNTs composite emulsion exhibited a fine and dark aspect， and the O?MWCNTs still presented good dispersibility after standing for 36 h.

Key words: carbon nanotube, functionalization, polyurethane, coating, dispersion

CLC Number:

TQ323.8

LI Yasen, SHANG Yudong, HE Jiangping, ZHANG Xiang, DONG Jiankun, SONG Ran. Study on Dispersion Properties of Multi⁃walled Carbon Nanotubes in Polyurethane⁃Based Coating Materials[J]. China Plastics, 2021, 35(7): 18-24.

Figures/Tables 10

Fig.1. Schematic diagram of functionalization of MWCNTs

Fig.2. TEM images of MWCNTs and O?MWCNTs

Fig.3. SEM images of MWCNTs and O?MWCNTs

Fig.4. FTIR spectra of MWCNTs and O?MWCNTs

Fig.5. XPS spectra of MWCNTs and O?MWCNTs

Fig.6. TG curves of MWCNTs and O?MWCNTs

Fig.7. Photos of PU， PU/MWCNTs and PU/O?MWCNTs composite emulsion

Fig. 8. Diagram of composite reaction of PU/MWCNTs and PU/O?MWCNTs

Fig.9. Dispersion of carbon nanotubes in different solvents

Fig.10. FTIR spectra of PU composites coated on polyester

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