Investigation of Surface Treatment of Carbon Fiber by Dynamic Method in the Polyurethane Composites

Document Type : Research Paper

Authors

1 Faculty of Materials and Manufacturing engineering, Malek Ashtar University of Technology, Tehran, Iran.

2 Polymer Engineering Department, Amir Kabir University, Tehran, Iran

3 Department of Chemical Engineering, Iran University of Science & Technology, Tehran, Iran.

4 Department of Aerospace engineering, Malek Ashtar University of Technology, Tehran, Iran.

5 Department of Chemical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran.

Abstract

Polyacrylonitrile (PAN)-based carbon fibers were chemically modified with a different ratio of Sulfuric acid (SA) to Nitric acid (NA), then reinforced Polyurethane (PU) composites in the presence of carbon fibers were prepared. The structural and surface characteristics of the modified carbon fibers were investigated by scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The FTIR results showed the presence of the carbonyl groups in a higher ratio of NA and the formation of carboxyl groups in a lower ratio of NA. The interaction between carbon fiber and PU matrix was studied by the dynamic mechanical thermal analysis (DMTA) method. The DMTA results showed with increasing carbon fiber/PU matrix interaction, the intensity of glass transition temperature decreased. Matching the DMTA results with the power-law model and Cole-Cole diagram showed that the process of carbon fiber modification can increase the amount of chain with a long relaxation time in the PU matrix.

Keywords

References

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Journal of Chemical and Petroleum Engineering
Volume 56, Issue 1
June 2022
Pages 37-52

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History

  • Receive Date: 16 October 2021
  • Revise Date: 14 November 2021
  • Accept Date: 16 November 2021

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