Evaluation of Photodegradation of Nylon 6 Studied by Dynamic Viscoelastic Measurements

Yano, Shoichiro; Murayama, Mikio

doi:10.1678/rheology1973.7.1_34

Cited by 4 publications

(1 citation statement)

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“…Because the increase in crystallinity was confirmed to be due to the fact that chain scission occurs mainly in the amorphous regions and the molecular relaxation of chains by chain scission enhances coagulation of the molecules. 26,27 This phenomenon is quite different from the chain scission 28,29 According to the reports for climate of Antarctic, 30,31 the irradiation quantity of ultraviolet rays increases year by year. The UV-A with wavelength of 315-400 nm, becomes maximum from December to January, while UV-B with wavelength 280-315 nm, which is injurious, on the beginning of December.…”

Section: 5mmentioning

confidence: 94%

Morphology and Mechanical Property of Nylon 6 Fibers in the Flags Exposed on the Route between Syowa Station and Dome Fuji in the Antarctic

Okuno

Nakano

Yoshida

et al. 2005

Polym J

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ABSTRACT:Degradation of fibers in the flags as well as color fading of the flags exposed in the Antarctic was investigated as one of indirect methods to take care of health for a number of scientists who study scientific works in out-door during the summer season. Because, it is anxious that the disruption of an ozone layer by freon-gas causes serious health impediments such as the occurrence of skin cancer and the denaturation of a gene, which endangers the life of human.The flags were set on the route between Syowa Station and Dome Fuji in the Antarctic for one year from the beginning of December 1994 to the end of November 1995. The original fibers with a circular cross section showed flat and smooth surface, while the fibers within the flag exposed on the route showed a weave-like shape by the disappearance of the skin parts. Such violent disruption was not observed for the flags exposed under mild weather in Japan. Because the average irradiation of an ultraviolet ray at the Antarctic as reported is about twice as that at Nishinomiya City observed as an example of mild weather in Japan.

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Section: 5mmentioning

confidence: 94%

Morphology and Mechanical Property of Nylon 6 Fibers in the Flags Exposed on the Route between Syowa Station and Dome Fuji in the Antarctic

Okuno

Nakano

Yoshida

et al. 2005

Polym J

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Effect of photodegradation on dynamic mechanical properties of nylon 6

Yano¹,

Murayama²

1980

J of Applied Polymer Sci

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SynopsisChanges in the dynamic mechanical properties of nylon 6 (a-form) under ultraviolet light irradiation were investigated. On irradiation with spectrally dispersed ultraviolet light in the wavelength range of 219-415 nm, the dynamic modulus E'and the density of nylon 6 were increased below about 300 nm. It was found that the increment in E' and the density were the result of crosslinking. When E' was measured with time elapsed during irradiation by light of 253.7 nm, E' initially decreased with time, increased at a longer time, and then reached a limiting value asymptotically. From the result of the change in E' with time, it was assumed that the scission and crosslinking reactions occur simultaneously during ultraviolet light irradiation. Thus, the change in E' with elapsed time was expressed by the equation E; = Eb exp (-kit) + Eb.[1-exp ( -k z t ) ] , where E ; is the dynamic modulus at time t , Eb is the E' at t = 0, Eb. is the limiting value of E', and k l and kz are the rate constants. The apparent activation energies for k l and k z were 3.23 and 2.50 kcal/mole, respectively, and the former value agreed with the activation energy for the scission of the amide groups. The effects of the photodegradation on the temperature dispersion of nylon 6 were also investigated. On irradiation with light at 253.7 nm, the a-relaxation which appeared at about 90°C was broadened and the intensity of the y-relaxation at -95OC in the tan 6-versus-temperature curve was lowered. The B-relaxation which appeared at -45OC for the wet nylon 6 decreased its intensity.

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Comparison of effects of ultraviolet and60Co gamma ray irradiation on nylon 6 mono-filaments

Ohtsuka¹,

Suzuki²,

Sakai³

et al. 2004

Fiber Polym

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Evaluation of Photodegradation of Nylon 6 Studied by Dynamic Viscoelastic Measurements

Cited by 4 publications

References 0 publications

Morphology and Mechanical Property of Nylon 6 Fibers in the Flags Exposed on the Route between Syowa Station and Dome Fuji in the Antarctic

Morphology and Mechanical Property of Nylon 6 Fibers in the Flags Exposed on the Route between Syowa Station and Dome Fuji in the Antarctic

Effect of photodegradation on dynamic mechanical properties of nylon 6

Comparison of effects of ultraviolet and60Co gamma ray irradiation on nylon 6 mono-filaments

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