Polymer thin film photodegradation and photochemical crosslinking: FT-IR imaging, evanescent waveguide spectroscopy, and QCM investigations

Millan, Mitchel D.; Locklin, Jason; Fulghum, Timothy; Baba, Akira; Advíncula, Rigoberto C.

doi:10.1016/j.polymer.2005.05.050

Cited by 50 publications

(51 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Among the numerous mechanisms for the photoreaction of PS, following reactions are accepted as part of photoreactions of solid PS in air. [61][62][63][64] When irradiated with deep-UV light, PS forms a PS radical, which leads to a peroxy radical and eventually PS hydroperoxide. The latter photolyzes into an alkoxy radical, leading to chain scission with the formation of a shorter chain PS radical and carbonyl species.…”

Section: Mechanism Of Srg Formationmentioning

confidence: 99%

Facile one-step photopatterning of polystyrene films

Ubukata

Moriya

Yokoyama

2012

Polym J

View full text Add to dashboard Cite

The development of nano-and micropatterned materials is a key component of advanced nanotechnology. We report herein, a photo-based method for patterning general-purpose polymer films. Patterned ultraviolet (UV) light irradiation of a thin polystyrene film under controlled temperature generates surface relief structures by mass transfer from shaded to irradiated areas. The resulting surface relief structure can be arbitrarily erased by heating and reconstructed by patterned UV light irradiation, and this process is repeatable. This new method thus enables fabrication of dynamic reversible patterning structures from various general polymers.

show abstract

Section: Mechanism Of Srg Formationmentioning

confidence: 99%

Facile one-step photopatterning of polystyrene films

Ubukata

Moriya

Yokoyama

2012

Polym J

View full text Add to dashboard Cite

show abstract

“…Photooxidation of irradiated PFS-isomers leads to increase in the intensity of absorbance in the bands with noticeable shift of energy at (1582-1449 cm -1 ) for o-PFS, at (1588-1449 cm -1 ) for m-PFS and at (1506 cm -1 ) for p-PFS. The shift in these ranges can be attributed either to the C = O stretching vibration of aromatic ketones, or to the stretching vibration of the substituted benzene ring (Millan, Locklin, Fulghum, Baba, & Advincula, 2003). The other increases in the region of (1219-1111 cm -1 ) of o-PFS, (1239-1137 cm -1 ) of m-PFS and (1224-1152 cm -1 ) of p-PFS, indicates that there is an increase in the number of C = C that resulted from hydrogen abstraction during chains scission process, or as indicated in the Table 5, it results from the (C -O -C) stretching vibration.…”

Section: Ft-ir Spectra For Non-irradiated and Irradiated Pure And Blementioning

confidence: 99%

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

Ani¹,

Anabtawi²

2012

IJC

View full text Add to dashboard Cite

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.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Polymer thin film photodegradation and photochemical crosslinking: FT-IR imaging, evanescent waveguide spectroscopy, and QCM investigations

Cited by 50 publications

References 41 publications

Facile one-step photopatterning of polystyrene films

Facile one-step photopatterning of polystyrene films

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

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

Contact Info

Product

Resources

About