Photodegradation kinetics of poly(para-substituted styrene) in solution

Ani, Khalid E. Al; Ramadhan, Afrah Essa

doi:10.1016/j.polymdegradstab.2008.04.010

Cited by 11 publications

(10 citation statements)

References 41 publications

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“…The absorption spectra for the three isomers, reveals absorption in the range of (260-280 nm), similar to those of polystyrene (Rao, 1975), and other substituted polystyrene (Al Ani & Ramadhan, 2008), but they have a different structures in the shape of the absorption spectrum. Figure1 shows the absorbance changes which accompany the irradiation of (1 × 10 -4 M) solution of PFS isomers at 265 nm.…”

Section: Uv-absorption Spectra Of Non-irradiated and Irradiated Poly mentioning

confidence: 79%

“…It was reported that polyene structure compounds are among the compounds resulted from the irradiated poly substituted styrene, and absorb in the UV-region. Accordingly, plasticized o-photoproducts PFS showed a higher increase in the absorption band as well as a change in the shape of the spectrum (Al Ani & Ramadhan, 2008).…”

Section: Uv-absorption Spectra Of Non-irradiated and Irradiated Poly mentioning

confidence: 99%

“…The thermal and photostability of substituted polystyrenes is important both from practical and theoritical viewpoints (Boinon, Ainad-Tabt, & Montheard, 1990;Bertini, Audisio, & Kiji, 1994;Al Ani, & Ramadhan, 2008). The investigation of thermal behaviours of para-substituted polystyrenes is of interest withrespect both to preperation of new polymeric materials and to the industerial importance of these polymers (Zuev, Bertini, & Audisio, 2001;Weir, Arct, & Farahani, 1985;McNeill & Coskun, 1989).…”

Section: Introductionmentioning

confidence: 99%

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UV-Irradiation Effect on the Photodegradation of Plasticized Poly (Ortho, Meta, and Para-Fluorostyrene) Isomers in Solid Films

Ani¹,

Anabtawi²

2012

IJC

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The photostability of thin films of poly (Fluorostyrene) isomers was studied by irradiation with UV-light, in presence of air at room temperature. The irradiated polymer films were exposed to different intervals of time and the degradation process was investigated with absorption, fluorescence and FT-IR spectroscopic methods. The influence of phthalate and terephthalate plasticizers on photo-oxidative degradation was also investigated. Blending with these plasticizers was found to decrease the stability of the irradiated polymers. The same observation was noticed in the photodegradation of other substituted polystyrenes films. The intensity of absorption was also found to increase with time of irradiation and in the intensity of a new absorption band at longer wavelength. In addition the formation on new fluorescence band at longer wavelength for the irradiated film is an evidence of photodegradation of the irradiated polymer films. The FT-IR spectra of irradiated polymers and for blended polymer films with phthalates and terephthalate, showed an increase in the absorption bands of these isomers indicating the possibility of degradation. The mechanism of photodegradation of these isomers was found to be similar to that of polystyrene. The order of photostability of these isomers was found that poly (p-fluorostyrene) is the most stable isomer and, poly (o-fluorostyrene) is the lowest stable isomer towards irradiation effect.

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Section: Uv-absorption Spectra Of Non-irradiated and Irradiated Poly mentioning

confidence: 79%

Section: Uv-absorption Spectra Of Non-irradiated and Irradiated Poly mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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UV-Irradiation Effect on the Photodegradation of Plasticized Poly (Ortho, Meta, and Para-Fluorostyrene) Isomers in Solid Films

Ani¹,

Anabtawi²

2012

IJC

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“…A subsequent (ROOH) decomposition results in the scission of polymeric chains and the formation of high molecular oxidation products such as carbonyl, alcohols and ethers [9] [10] [11] [12]. Photogegradation of polymeric chains in presence of air is triggered by the formation of peroxy free radicals, which degraded the polymeric structures through a series of chemical reactions, which lead to chain scissions and cross linking in the polymeric back bone.…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that photodegradation of most of substituted polystyrene are more easily photodegradable than polystyrene, owing to the weak bonds in substituted polystyrene structures. The studies of photodegrada- It should be pointed out that polymeric additives were found to accelerate the radiation-induced degradation of polystyrene and substituted polystyrene [9] [25]. Phthalate and terephthalate as additives to substituted polystyrene causes an increase in its flexibility, but increase the stability of the polymeric chains [26] [27].…”

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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Fourier‐transform infrared spectroscopic study of plasticization effects on the photodegradation of poly(fluorostyrene) isomers films

Ani

Ramadhan

Sieadi

2015

Vinyl Additive Technology

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The photodegradation of poly(fluorostyrene) isomers with different amounts of phthalate and terephthalate plasticizers has been investigated with the aid of Fourier‐transform infrared spectroscopy. Photo irradiation was carried out with light from a Hydrogen‐Xenon lamp at 265 nm and 293 K. As irradiation time increased, changes occurred in the structure of the polymers due to the destruction of polymeric chains and the formation of new photo products during the degradation. The photo products caused shifts, an increase or decrease of the polymer vibrational frequencies, as well as changes in numerous infrared band intensities. The increase in the intensities of the analyzed ranges is attributed to the formation of carbonyl, hydroxyl, and aliphatic ketones and to the increase in the number of polyene structures that resulted from hydrogen abstraction during photodegradation reactions. The analysis of the Fourier‐transform infrared spectra of the irradiated and nonirradiated samples showed a noticeable formation of a new broad band centered at (1,727 cm−1, C=O), assigned to the growth of aliphatic ketones formerly from the reaction of reactive alkoxy radicals. Its intensity was found to increase with the increase in irradiation time and also with the increase in the amount of added terephthalate and phthalates plasticizer, indicating an increase in the efficiency of the photo degradation process. Trends of photostability of these isomers were found such that poly(para‐fluorostyrene) > poly(meta‐fluorostyrene) > poly(ortho‐fluorostyrene). The photodegradation process for these plasticized isomers was found to increase by the increase in the bulkiness of the plasticizer molecule. J. VINYL ADDIT. TECHNOL., 24:75–83, 2018. © 2015 Society of Plastics Engineers

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Photodegradation kinetics of poly(para-substituted styrene) in solution

Cited by 11 publications

References 41 publications

UV-Irradiation Effect on the Photodegradation of Plasticized Poly (Ortho, Meta, and Para-Fluorostyrene) Isomers in Solid Films

UV-Irradiation Effect on the Photodegradation of Plasticized Poly (Ortho, Meta, and Para-Fluorostyrene) Isomers in Solid Films

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

Fourier‐transform infrared spectroscopic study of plasticization effects on the photodegradation of poly(fluorostyrene) isomers films

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