Effect of UV irradiation on mechanical properties and structure of poly(1,3,4-oxadiazole) fibers

Shi, Meiwu; Dong, Linan; Ma, Yingying; Ye, Guangdou; Xu, Jianjun

doi:10.1016/j.polymdegradstab.2010.08.006

Cited by 29 publications

(19 citation statements)

References 11 publications

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“…It indicates that the degradation of the p ‐POD macromolecules mainly occurs during UV irradiation, and the decline of intrinsic viscosity is also attributed to photodegradation. The modified dyes (1:3), which contain POSS structure, fixed on the fiber surface can effectively restrict the oxadiazole rings to be broken by oxygen . Furthermore, the data in Table also show that the intrinsic viscosity of the dyed sample is slightly higher than that of original fiber.…”

Section: Resultsmentioning

confidence: 93%

“…Aromatic poly(l,3,4‐oxadiazole) (POD) fibers can be widely used in various industrial fields in recent decades . But it has been reported that p ‐POD is sensitive to ultraviolet (UV) light and present weak UV resistance . So some research progresses have been made in the area of increasing UV protection of fiber based on the application of the fiber in industrial and military fields …”

Section: Introductionmentioning

confidence: 99%

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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

J of Applied Polymer Sci

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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.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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

J of Applied Polymer Sci

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“…Taking advantage of photo‐cleavage of the oxadiazole unit of the polymer, the patterning of POD‐1 was possible in the presence of a PAG using a photomask by irradiating UV on the desired region. Figure S2 (see Supporting Information) shows the possible mechanism of the photoreaction 27–30. The oxadiazole ring of the main chain is known to be broken by UV irradiation to afford low molecular weight fragments which are soluble in DMF.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Fluorescence Switching from a Patternable Poly(1,3,4‐oxadiazole) Thin Film

Seo

Kim

You

et al. 2011

Macromol. Rapid Commun.

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A highly soluble poly(1,3,4-oxadiazole) (POD) substituted with long alkyl chains was examined for electrochemical fluorescence switching. The high solubility of the polymers enabled a simple fabrication of an electrochemical cell, which showed reversible fluorescence switching between dark (n-doping) and bright (neutral) states with a maximum on/off ratio of 2.5 and a cyclability longer than 1000 cycles. Photochemical cleavage of the oxadiazole in POD allowed photo-patterning of the POD film upon exposure to UV source. The patterned POD films displayed patterned image reversibly under a step potential of +1.8/-1.8 V.

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“…Poly( p ‐phenylene‐1,3,4‐oxadiazole) ( p ‐POD) fiber, which is the most commonly used, can be used for heat‐resistant composite materials, filtration fabrics, and protective working clothes, and the special membranes may be used for gas separation or reverse osmosis . These two polymers are sensitive to UV light and have presented weak UV resistance in the reported literature . Fully aromatic polymers with rigid chain structures, such as polythiophene, poly‐ p ‐phenylene benzobisthiazole, and poly(phenylene vinylene), degrade much faster than nonaromatic polymers under the same UV conditions.…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that the most significant damage of PPTA fibers usually occurred after UV radiation with a wavelength of about 310 nm; this led to severe amide‐bond breakages . Similar to PPTA fibers, the mechanical properties, such as the tensile strength, resilience, and fracture toughness, of p ‐POD fibers obviously decreased because the oxadiazole ring of the structural unit was partly opened and the tight aggregation structure of the fibers was gradually destroyed . Therefore, it is important to improve the UV resistance of the PPTA and p ‐POD 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

J of Applied Polymer Sci

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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.

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Effect of UV irradiation on mechanical properties and structure of poly(1,3,4-oxadiazole) fibers

Cited by 29 publications

References 11 publications

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

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

Electrochemical Fluorescence Switching from a Patternable Poly(1,3,4‐oxadiazole) Thin Film

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

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