Improving the photo-stability of high performance aramid fibers by sol-gel treatment

Disperse Red 60 modified with octavinyl polyhedral oligomeric silsesquioxanes (POSS) was used to color poly(p-phenylene-1,3,4-oxadiazoles) (p-POD) fiber. The dyed p-POD fiber was given high UV resistance and excellent color strength (K/S value) simultaneously. And the effects of the UV irradiation time on the K/S values and the strength retention of dyed fiber were investigated. The results indicated that the modified dye (1:3) molecules can easily be adsorbed on fiber surface and diffuse into fiber, whose fixing form on the fiber surface is a semiembedded type. Meanwhile, the surface morphology, the aggregation structure, the thermal property, the color fastness, and anti-UV durability of the dyed p-POD fiber were characterized. After UV accelerated aging, the macroscopic and microscopic structures of the dyed p-POD fiber can well be maintained and the color fastness is also satisfactory. Meanwhile, this method also solves the problem of poor anti-UV durability of the modified fiber with the previous processes.

Section: Resultsmentioning

confidence: 87%

Improving the UV resistance of aromatic poly(1,3,4‐oxadiazole) fiber using the disperse dye modified with octavinyl POSS. Part 2: Fixing form of dye and UV resistance ability

Mao¹,

Xiong²,

Guan

2017

“…put forward that the conjugate structure of PBO polymers chains and the π–π stacking in the crystals determined the photosensitivity of PBO fibers. Liu et al . proposed that PBO fibers have a skin‐core structure, the microfibers of the cortex are bound together by weak intermolecular forces and prone to microfibrillation.…”

Section: Introductionmentioning

confidence: 99%

“…3,8,9 Walsh et al 10 put forward that the conjugate structure of PBO polymers chains and the π-π stacking in the crystals determined the photosensitivity of PBO fibers. Liu et al 11 proposed that PBO fibers have a skin-core structure, the microfibers of the cortex are bound together by weak intermolecular forces and prone to microfibrillation. Therefore, the UV degradation of PBO fibers were first the PBO backbone destroyed and forming amide bond, then the molecular chain was broken to generate terephthalate and 4,6-diaminoresorcinol.…”

Section: Introductionmentioning

confidence: 99%

In situ synthesis of PBO‐α‐(amino phthalocyanine copper) composite fiber with excellent UV‐resistance and tensile strength

Wang

Zhao

et al. 2018

The anti‐ultraviolet (UV) aging of the poly(p‐phenylene benzobisoxazole) (PBO) is very important and has been paid much attention recently. In this study, copolymerization of PBO and α‐amino phthalocyanine copper (α‐TDMACuPc) was carried out by in situ polymerization and the fiber was obtained by dry‐jet wet spinning in the liquid crystal state. Inducing of α‐TDMACuPc into PBO macromolecules improve the molecular network and enhanced the tensile strength of PBO fiber. With the capability of absorbing UV light into the PBO molecular chain, PBO copolymer fibers showed excellent anti‐UV aging performance and changed with the block structure. It is found that the retention of tensile strength after 100 h of UV irradiation was improved from 66.44% of PBO to 88.80% of PBO‐2.0 wt % α‐TDMACuPc fiber. Meanwhile, the degree of UV etching of the fibers decreased with the addition of α‐TDMACuPc. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46870.

“…Xing and Ding and Liu et al . used tetrabutyl titanate as the sol–gel precursor of a nanosized TiO 2 coating to improve the photostability of PPTA fibers.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet resistance modification of poly(p‐phenylene‐1,3,4‐oxadiazole) and poly(p‐phenylene terephthalamide) fibers with polyhedral oligomeric silsesquioxane

Mao

Zhou

2015

Octa-ammonium chloride salt of polyhedral oligomeric silsesquioxane (POSS) was synthesized by a hydrolysis reaction and introduced into poly(p-phenylene-1,3,4-oxadiazole) (p-POD) and poly(p-phenylene terephthalamide) (PPTA) fibers by a finishing method to enhance the UV resistance. The effects of the POSS concentration, treatment temperature, and time on the tensile strength of the fibers were investigated. The surface morphology, mechanical properties, crystallinity, degree of orientation of fibers, and intrinsic viscosity of the polymer solution were characterized in detail. The results indicate that the tensile strength retention and intrinsic viscosity retention of the fibers treated with POSS were much higher than those of the untreated fibers after the same accelerated irradiation time; this demonstrated that this treatment method was feasible. We also found that the efficacy of the protection provided by POSS was more beneficial to p-POD than PPTA because of the different structure.