Quantum yields for loss of carbonate ester bonds in polymeric nuclear track detectors under 222 nm UV radiation

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  • 紫外線照射下における高分子系飛跡検出器中カーボネートエステル結合損失の量子収率
  • シガイセン ショウシャカ ニ オケル コウブンシケイ ヒセキ ケンシュツキチュウ カーボネート エステル ケツゴウ ソンシツ ノ リョウシ シュウリツ

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Abstract

The effects of ultraviolet (UV) photons on bisphenol-A polycarbonate, PC, polyethylene telephtalate, PET, and poly (allyl diglycol carbonate), PADC, at a wavelength of 222 nm has been examined by means of FT-IR spectrometry, which have been applied for polymeric nuclear track detectors. The progress of photo-Fries reaction has been found in PC, as well as de-carbonyl reaction forming CO or CO2 gases. The quantum yield for the de-carbonyl reaction is about 2×10-3, which is almost equivalent to that of simple shift of carbonyl due to hydroxyl group on the neighboring polymer chains. Norrish I and II type reactions have been found in PET. The de-carbonyl reaction is hardly observed in the early stage of the UV irradiations. The de-carbonyl reaction in PADC is hardly enhanced in the early stage of the exposure. On the other hand, breaking of ether bonds in PADC progressed effectively under the UV ray. Only above a fluence of 3.9×1019 photons/cm2, the de-carbonyl reaction will start in PADC.

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