材料科学
光引发剂
丙烯酸酯
辐照
紫外线固化
光致聚合物
固化(化学)
傅里叶变换红外光谱
汞蒸气灯
准分子
光化学
涂层
复合材料
聚合物
化学工程
光学
光电子学
聚合
共聚物
激光器
单体
化学
物理
核物理学
工程类
作者
Frank Bauer,Ulrich Decker,Sergej Naumov,Carsten Riedel
标识
DOI:10.1016/j.porgcoat.2010.07.001
摘要
To elucidate the effect of short-wavelength vacuum UV (VUV) irradiation on the UV curing and matting of acrylate formulations, a real-time (ATR) FTIR spectrometer attached to a UV lamp set-up consisting of a monochromatic 172 nm (Xe2*) excimer lamp or a polychromatic medium pressure mercury arc lamp has been applied. In the presence of a photoinitiator, both the 172 nm excimer lamp and the mercury lamp yielded a similar degree of acrylic CC bond conversion, i.e. the wavelength of UV irradiation was found to have no significant impact on acrylate conversion. But, short-wavelength VUV irradiation of acrylates results in radical formation and self-initiation of the photopolymerization, i.e. photoinitiator-free curing of acrylates. Furthermore, real-time (ATR) FTIR spectroscopy showed a decrease of the intensity of CO vibrations by 172 nm irradiation within thin layers (<1 μm). This radical formation via CO bond activation is assumed to occur at the surface of thoroughly cured films yielding a higher network density of the coating via radical recombination reactions. Thus, UV-matted acrylate coatings show enhanced surface hardness and improved chemical resistance.
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