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Open AccessArticle

Improving UV Resistance of Aramid Fibers by Simultaneously Synthesizing TiO2 on Their Surfaces and in the Interfaces Between Fibrils/Microfibrils Using Supercritical Carbon Dioxide

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School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201600, China
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Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201600, China
3
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 200051, China
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(1), 147; https://doi.org/10.3390/polym12010147
Received: 25 November 2019 / Revised: 3 January 2020 / Accepted: 3 January 2020 / Published: 7 January 2020
(This article belongs to the Special Issue Supercritical Fluids Technology for Polymer Applications)
Aramid fibers with low density and high strength, modulus, and thermal resistance are widely used in applications such as bulletproof vests and cables. However, owing to their chemical structure, they are sensitive to ultraviolet light, which degrades the fibers’ useful mechanical properties. In this study, titanium dioxide (TiO2) nanoparticles were synthesized both on the aramid III fiber surface and in the interfacial space between the fibrils/microfibrils in supercritical carbon dioxide (scCO2) to improve the UV resistance of aramid fibers. The effects of scCO2 treatment pressure on the TiO2 structure, morphology, surface composition, thermal stability, photostability, and mechanical properties were investigated using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, ultraviolet–visible spectroscopy, and single-fiber test. The results show that amorphous TiO2 formed on the fiber surface and the interface between fibrils/microfibrils, and decreased the photodegradation rate of the aramid III fiber. Moreover, this modification can also improve the tensile strength via treatment at low temperature and without the use of a solvent. The simple synthesis process in scCO2, which is scalable, is used for mild modifications with a green solvent, providing a promising technique for synthesizing metal dioxide on polymers. View Full-Text
Keywords: aramid III fiber; TiO2; supercritical carbon dioxide; UV Resistance aramid III fiber; TiO2; supercritical carbon dioxide; UV Resistance
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MDPI and ACS Style

Sun, H.; Kong, H.; Ding, H.; Xu, Q.; Zeng, J.; Jiang, F.; Yu, M.; Zhang, Y. Improving UV Resistance of Aramid Fibers by Simultaneously Synthesizing TiO2 on Their Surfaces and in the Interfaces Between Fibrils/Microfibrils Using Supercritical Carbon Dioxide. Polymers 2020, 12, 147.

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