VUV‐Induced Photopolymerization of Acrylates
VUV‐Induced Photopolymerization of Acrylates
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VUV 诱导丙烯酸酯的光聚合
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发表时间：
2012
期刊：
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通讯作者：
T. Scherzer
中科院分区：
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作者：
T. Scherzer
丙烯酸酯和甲基丙烯酸酯在没有光引发剂的情况下，通过暴露在172nm的辐射下进行光聚合。采用实时傅立叶变换红外衰减全反射光谱（FTIR-ATR）研究了聚合动力学。结果表明，厚度约为500 nm的聚合物层可以快速聚合。研究了丙烯酸酯的结构、粘度、官能性、吸收率以及温度和氧浓度对反应性的影响。在≈2 μm厚度的层中观察到较强的转换梯度，这反映了层内的强度梯度。然而，聚合物进入层内的穿透深度超过了VUV辐射的初始穿透深度，这表明在辐射过程中丙烯酸酯发生了强烈的漂白。
Acrylates and methacrylates are photopolymerized without photoinitiator by exposure to 172 nm radiation. The kinetics of the polymerization is studied using real-time Fourier-transform infrared attenuated total reflectance (FTIR-ATR) spectroscopy. It is shown that layers with a thickness of ≈500 nm can be polymerized very rapidly. The effect of structure, viscosity, functionality, and absorption of the acrylates as well as the influence of temperature and oxygen concentration on the reactivity are studied. A strong conversion gradient is observed in layers up to ≈2 μm thickness, which reflects the intensity gradient within the layer. However, the penetration of the polymerization into the layer exceeds the initial penetration depth of the VUV radiation, which indicates strong bleaching of the acrylates during irradiation.