Li, Zhihua, et al. Scientific Reports 9.1 (2019): 8599.
PBO fibers are high-performance materials used in demanding environments but are susceptible to UV-induced degradation and can be relatively hydrophilic. This study examined a surface modification strategy incorporating the UV absorber UV-328 alongside a fluorosilane to simultaneously address both limitations.
Product Application & Process: A multi-step surface engineering process was employed. First, PBO fibers were functionalized with an epoxysilane coupling agent (KH-560) to create a reactive surface. Subsequently, prepare a coating solution of silicone-modified epoxy resin (3 g) and polyamide 650 (0.45 g) dissolved in 15 g ethyl acetate, then add 0.09 g HFTES (1H,1H,2H,2H-perfluorodecyltrimethoxysilane) and 0.5 g UV-328 by sonication. ƒ-PBO fibers were immersed at 50 °C for 10 min and cured at 65 °C for 3 h, yielding HFTES/UV-328/ƒ-PBO.
Key Performance
· Water contact angle increased from 51.7° (pristine) to 127° after coating - reported as an increase of 128%. Introduction of UV-328 did not noticeably affect hydrophobicity; the major hydrophobicity gain derived from the HFTES fluorosilane topcoat.
· Dramatically Improved UV Aging Resistance: After 400 hours of UV exposure, the tensile strength retention ratio of the fibers coated with the HFTES/UV-328 composite was 53%, which is markedly superior to the 21.4% retention observed for unmodified PBO fibers. Applying three coating layers yielded the best UV protection, achieving a tensile strength retention ratio of 59%.
Wei, Junyan, et al. Journal of Environmental Chemical Engineering 11.5 (2023): 110759.