U.v.-irradiation of thin films of polystyrene derivatives: formation of carboxylic group and crosslinking from 4-trimethylsilylmethyl substituent

Tamai, Toshiyuki; Hashida, Isao; Ichinose, Nobuyuki; Kawanishi, Shunichi; Inoue, Hiroo; Mizuno, Kazuhiko

doi:10.1016/s0032-3861(96)00438-7

Cited by 27 publications

(30 citation statements)

References 15 publications

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“…Numerous mechanisms for polystyrene photodegradation under UV-irradiation have been proposed by many authors [40][41][42][43], but a totally consistent theory is yet to be agreed upon due to the complexity of the kinetics and the formation of different photodegradation products, The mechanism of photodegradation of PCS and PBS was prepared in a similar basis and according to the results obtained from the changes in the UV-vis, fluorescence and FT-IR spectra of irradiated pure and blended PCS and PBS films, as seen in Scheme 1.…”

Section: Effect Of Uv-irradiation Time On Fluorescence Spectra Of Purmentioning

confidence: 99%

Plasticization Effect on the Photodegradation of Poly (4-Chlorostyrene) and Poly (4-Bromostyrene) Films

Ani¹,

Ramadhan²

2010

MSA

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The photodegradation of thin films of poly (4-chlorostyrene) and poly (4-bromostyrene) with 265 nm radiation in the presence of oxygen and as a function of irradiation time has been studied mainly using fluorescence, FT-IR, and UV-VIS spectroscopic techniques. The influence of phthalate and terephthalate plasticizers on photo-oxidative degradation was also investigated. Phthalate and terephthalate-plasticizers were found to increase the photodegradation processes in polymeric chains. On the other hand, the intensity of absorption was also found to increase with irradiation time and in the intensity of a new absorption band at longer wavelength. The appearance of new fluorescence bands in the irradiated polymer films can well indicate a possibility of photodegradation of polymer films. In addition, the observed increase in the intensities of the carbonyl and hydroxyl regions of the FT-IR spectra, providing evidence for the photodegradation as well as the photo-oxidation of polymeric chains. The increase in the analyzed ranges wasattributed to the formation of alcohols, aliphatic ketones and to the increase in the number of (C=C) that resulted from hydrogen abstraction during chains-scission.

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Section: Effect Of Uv-irradiation Time On Fluorescence Spectra Of Purmentioning

confidence: 99%

Plasticization Effect on the Photodegradation of Poly (4-Chlorostyrene) and Poly (4-Bromostyrene) Films

Ani¹,

Ramadhan²

2010

MSA

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“…It was found that the mechanism of photodegradation of polystyrene and substituted polystyrene depends upon the mobility of free radicals in polymeric matrix, and their bimolecular combination [13]. As a result of decomposition of irradiated chromophores, Hydrogen radicals are formed, and they diffuse through the polymer matrix and finally initiate a free radical decomposition of polymer chains [14] [15] [16]. The photo-oxidation mechanism of PS chromophores in solid films is dependent upon the rate of oxygen diffusion into the polymer matrix, and to the formation of charge transfer complexes between polymer structures and oxygen molecules [17].…”

Section: Introductionmentioning

confidence: 99%

Study the Influence of UV-Irradiation on the Photo Stability of Pure and Plasticized Poly (4-Vinyl Biphenyl) in Solid Films

Ani¹,

Ramadhan²,

Khanfar³

2017

MSA

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The effect of UV irradiation and blending with phthalate and terephthalate plasticizers on the photo-stability of Poly (4-vinyl biphenyl) was studied at different intervals of irradiation time and in presence of air. The increase in irradiation time on the photodegradation of polymer thin films caused a change in the intensity and shape of the fluorescence band. It has been found that the stability of the polymer decreases with the increase of irradiation time, and to increases with the increase of the amount of added phthalate and terephthalate plasticizers, which is evidence of polymer photodegradation.The FT-IR spectra of irradiated pure and blended polymer with phthalate and terephthalate plasticizers showed a decrease in some absorption bands and increase in the other bands, this is also another factor for the occurrence of photo degradation of the irradiated polymer. The increase in the intensity of absorption of carbonyl and hydroxyl region, indicates a possible photogegradation of polymeric chains and the formation of alcohols, aliphatic ketones and to the increase in the number of (C=C) that resulted from hydrogen abstraction during chains-scission.

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“…Free hydrogen radicals diffuse very easily through the polymer matrix, and combine in pairs or abstract hydrogen atoms from polymer chromophores. Phenyl radicals have limited mobility and may abstract hydrogen from the near surroundings, or combine with either a polymer radical in the vicinity, or with hydrogen radical [21] [22]. The photo-oxidation mechanism of PS chromophores in solid films is dependent upon the rate of oxygen diffusion into the polymer matrix, and to the formation of charge transfer complexes between polymer chromophores and oxygen molecules [23].…”

mentioning

confidence: 99%

Irradiation Effect on Photodegradation of Pure and Plasticized Poly (4-Methylstyrene) in Solid Films

Safi¹,

Mouamin²,

Sieadi³

et al. 2014

MSA

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The photodegradation of irradiated thin films of poly (para-methylstyrene) with 265 nm radiations in the presence of airand as a function of irradiation time has been studied using UV-VIS, fluorescence and FT-IR Spectroscopic techniques. The influence of phthalate and terephthalate plasticizers on stability of poly (para-methylstyrene) towards irradiations was also investigated. Blending with phthalate plasticizers was found to cause a higher efficiency of photodegradation than that obtained in doping with terephthalate plasticizers. The intensity of absorption was also found to increase with time of irradiation and in change in the shape of the spectra at longer wavelength, thus indicating a possibility of photodegradation of polymer chains. The analysis of the FT-IR spectra of the irradiated and non-irradiated samples, shows a predominant absorption associated with carbonyl compounds with 1740 cm −1 . In addition, the observed increase in the intensities of the carbonyl and hydroxyl regions of the FT-IR spectra, have provided an evidence for the photodegradation as well as photo-oxidation of polymeric chains. The presence of the plasticizer in the polymer backbone was found to accelerate the photodegradation of polymeric chains.

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U.v.-irradiation of thin films of polystyrene derivatives: formation of carboxylic group and crosslinking from 4-trimethylsilylmethyl substituent

Cited by 27 publications

References 15 publications

Plasticization Effect on the Photodegradation of Poly (4-Chlorostyrene) and Poly (4-Bromostyrene) Films

Plasticization Effect on the Photodegradation of Poly (4-Chlorostyrene) and Poly (4-Bromostyrene) Films

Study the Influence of UV-Irradiation on the Photo Stability of Pure and Plasticized Poly (4-Vinyl Biphenyl) in Solid Films

Irradiation Effect on Photodegradation of Pure and Plasticized Poly (4-Methylstyrene) in Solid Films

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