Photochemistry of ring substituted polystyrenes—Part IV: Photolyses of poly(o-, m-, p-methylstyrenes)

Weir, N.A.; Milkie, T. H.

doi:10.1016/0141-3910(79)90015-6

Cited by 11 publications

(3 citation statements)

References 11 publications

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“…Extension of this conjugation ultimately leads to a bathchromic shift in the absorption spectrum, hence to the formation of colored solution of irradiated PFS isomers solutions. Similar results have been reported on halogenated polystyrenes and PS, showed an increasing in the intensity of the absorption spectra with the increase in irradiation time (Weir & Milkie, 1979a).…”

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

confidence: 77%

“…On the other hand, the irradiated poly (p-fluorostyrene) film, showed a higher stability than that observed in the irradiated polystyrene film, presumably the result of the positive conjugative effects of Br, and Cl groups on the phenyl group absorption around 260 nm (Weir & Milkie, 1979a). The effect of increase in the intensity of absorption bands of the three isomers was fond to be in the order o-PFS > m-PFS > p-PFS, indicating that p-PFS is most stable isomer towards UV-irradiation.…”

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

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 supporting

confidence: 77%

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

confidence: 99%

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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“…13 The real-time monitoring of swellingdeswelling behaviors is possible for stimuli-responsive polymer brushes. 11,12 Moreover, the swelling ratio along the thickness direction is highly dependent on the surrounding environment, 14,15 which is practical for the simple, convenient measurement of the degree of polymer-solvent interaction.…”

Section: Introductionmentioning

confidence: 99%

Localized surface plasmon-enhanced nanosensor platform using dual-responsive polymer nanocomposites

Choi

Yoo

et al. 2013

Nanoscale

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The fast and accurate identification of unknown liquids is important for the safety and security of human beings. Recently, sensors based on the localized surface plasmon resonance (LSPR) effect demonstrated an outstanding sensitivity in detecting chemical and biological species. In the present study, we suggest that a dual-responsive nanocomposite composed of two polymer brushes and two noble metal nanoparticles provides a significantly improved selectivity (improvement of a factor of 30 in figure-of-merit) for distinguishing diverse liquids compared to a single-responsive LSPR sensor. The dual-responsive LSPR sensor platform was realized by the synergic combinations of two hydrophobic and hydrophilic polymer brushes, which respond differently depending on the degree of interaction between the polymer brushes and the surrounding liquids. Moreover, the mixing ratio of two solvents can also be estimated with high accuracy using the dual-nanocomposite LSPR sensor, suggesting that this approach would be highly practical for in situ process monitoring systems that can instantly detect the change of solvent composition.

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On the kinetics and mechanism of thermal degradation of poly(p‐methylstyrene)

1987

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The thermal behavior of polydisperse poly@-methylstyrene) (PPMS) samples with a' s of 99200 and 356000 g/mol was investigated under oxygen-free conditions at temperatures between 220 and 345 "C. The reaction products were analysed by gel permeation chromatography (GPC), gas chromatography (GC) and swelling measurements. In the initial stage of the reaction crosslinking occurs; at higher temperatures the gel decomposes to polymers with a low degree of polymerization and to volatile products with molecular weights in the range up to trimers. A radical chain mechanism is proposed for degradation which explains the experimental results. On this basis a model is evaluated for gel formation, which is discussed in detail. The results of the present investigation are compared with the thermal degradation of polystyrene (PS) which is chemically similar but does not crosslink.,60 2,75 c P ff

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Photochemistry of ring substituted polystyrenes—Part IV: Photolyses of poly(o-, m-, p-methylstyrenes)

Cited by 11 publications

References 11 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

Localized surface plasmon-enhanced nanosensor platform using dual-responsive polymer nanocomposites

On the kinetics and mechanism of thermal degradation of poly(p‐methylstyrene)

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