Preparation and Characterization of Surface Modified PPTA Fibers by Ultrasonic-Assisted Hydrogen Peroxide Solutions
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The simplest peroxide, hydrogen peroxide (H2O2) was used to prepare the surface modified poly(p-phenylene terephthalaramide) (PPTA) fibers under the assistant of ultrasonic vibration. Fourier transform infrared spectroscopy (FTIR) spectra indicated the increase of the active polar groups on the surface of the fibers. X-ray photoelectron spectroscopy (XPS) analysis confirmed that more carboxyl groups and hydroxyl groups have been obtained after this treatment. Scanning electron microscope (SEM) showed that the surface roughness of the fibers has been improved accordingly. The interfacial properties of modified PPTA fiber/epoxy composites were investigated by the single fiber pull-out test (SFP). The results showed that the interfacial shear strength (IFSS) of PPTA/epoxy composites was remarkably improved by 42.14 % while the breaking strength was not affected appreciably. The modified fiber presented 26.9 % higher moisture regain compared with the original fiber. It proved to be an efficient method to make the surface modified PPTA fiber for the application of the advanced composites at a relatively low cost.
KeywordsPPTA fiber Modification Structure Ultrasonic Hydrogen peroxide
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The authors thank the editors and the reviewers for their constructive comments, which helped us to improve the manuscript. We are also grateful to Dr. Zhaohui Jiang, Zengge Guo and Qicai Wang for their highly enlightening suggestions in the revising of the manuscript.
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