Photoinitiated rearrangements in poly[2,2‐propanebis(4‐phenyl carbonate)]

Belluš, D.; Hrdlovič, Pavol; Maňásek, Z.

doi:10.1002/pol.1966.110040101

Cited by 53 publications

(12 citation statements)

References 7 publications

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“…The consequences of photooxidation are the oligomers and bisphenol A structure. 13,[21][22][23] The penetration depth of a UV beam into a polymer is dependent on the nature of polymer material, based on its absorption coefficient. The penetration depth is a distance at which 63.2% of the incident energy is absorbed, and it can be defined as the reciprocal absorption coefficient.…”

Section: Mechanism Of Photooxidation By Laser Irradiationmentioning

confidence: 99%

The effects of excimer laser irradiation at 248 nm on the surface mass loss and thermal properties of PS, ABS, PA6, and PC polymers

Sancaktar

2005

J of Applied Polymer Sci

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ABSTRACT:Excimer laser irradiation provides a new and important method for polymer surface treatment. In this work, the weight loss of engineering polymers PC, ABS, PS, and nylon 6 were investigated following irradiation by KrF excimer laser. The experimental results revealed that the polymeric weight loss is nonlinearly related to the laser energy and laser frequency for most of the materials tested. The effects of laser irradiation on the thermal properties (T g or T m ) of the polymers were investigated using DSC. It was found that the T g and T m of these materials decreased as a result of laser treatment, indicating the degradation effect of the laser irradiation procedure.

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Section: Mechanism Of Photooxidation By Laser Irradiationmentioning

confidence: 99%

The effects of excimer laser irradiation at 248 nm on the surface mass loss and thermal properties of PS, ABS, PA6, and PC polymers

Sancaktar

2005

J of Applied Polymer Sci

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“…It is well established that photodegradation occurs via two wavelength‐dependent mechanisms, photo‐Fries rearrangement and photo‐oxidation. In 1966, Bellus et al identified Photo‐Fries reactions in a chloroform solution of PC irradiated with 254 nm UV light produced via a medium‐pressure mercury lamp . Later (1971–1973), Humphrey et al conducted microsecond flash photolysis experiments on PC and model compounds in dichloroethane solution .…”

Section: Introductionmentioning

confidence: 99%

Acetone absorption in UV‐irradiated polycarbonate

Hsiao

Harmon

Chuang

et al. 2017

Polymer Engineering & Sci

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Isothermal acetone absorption in UV‐irradiated polycarbonate (PC) was investigated at temperatures from −23 to +25°C. The crystalline fraction of PC increased with UV dose. The anomalous transport data were analyzed based on Harmon's model which includes contributions from Case I transport characterized by the diffusion coefficient, D, and Case II transport characterized the velocity, v. Diffusion coefficients were monitored by both mass uptake using the model (D and v), and movement of the sharp front (Df). Plots of log of D, v, and equilibrium swelling ratio (ESR) versus 1/T exhibited similar features. That is, plots were linear and superimposable for all doses at the higher temperatures, and exhibited a transition temperature and then a linear region that varied with dose. The values of D, Df, and v increased with increasing dose, whereas the ESR decreased with dose. The direction of Case II transport was opposite to that of Case I diffusion during which time, sorbed solvent was expelled from the samples. Results are discussed in terms of a solvent‐induced change in lattice structure at the lower temperatures and in terms of UV radiation effects on the PC matrix that enhance solvent crystallization. POLYM. ENG. SCI., 58:1174–1183, 2018. © 2017 Society of Plastics Engineers

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“…During the past three decades there have been a large number of papers written describing the photochemical decomposition of bisphenol A (BPA) based polycarbonate (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19). From a review of the most recent literature published during the last 10 years, it is readily apparent that there are indeed a number of pathways which comprise the composite photodegradation process of polycarbonate.…”

Section: Introductionmentioning

confidence: 99%