Effect of Oxygen Inhibition on the Kinetic Constants of the UV-Radical Photopolymerization of Diurethane Dimethacrylate/Photoinitiator Systems

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• 作者：Kentaro Taki ; Yoshihito Watanabe ; Hiroshi Ito ; Masahiro Ohshima
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：March 25, 2014
• 年：2014
• 卷：47
• 期：6
• 页码：1906-1913
• 全文大小：426K
• 年卷期：v.47,no.6(March 25, 2014)
• ISSN：1520-5835

文摘

The kinetic constants of propagation (k_p) and termination (k_t) for a diurethane dimethacrylate/1-hydroxycyclohexyl phenyl ketone (Irgacure 184) system were measured using a dark polymerization technique that employs real-time FT-IR spectroscopy to measure the conversion and reaction rate of the methacrylate group at different time points. The sample was placed between two optically polished KBr plates with a 10 渭m metal spacer. A series of measurements resulted in a gradual peak in the kinetic constants at a 0.15 conversion of the methacrylate group. The kinetic constants for the conversion, which ranged from 0.15 to 0.5, were used to obtain the parameters of the Anseth鈥揃owman model to generate a numerical simulation of the photopolymerization kinetics. The kinetic equations, the oxygen inhibition reaction-diffusion equation, and the macroradical mass balance model indicated that the gradual peak in the kinetic constant was caused by an oxygen inhibition reaction. The Anseth鈥揃owman model for k_p and k_t was effective even if oxygen inhibition occurred, when the oxygen inhibition reaction鈥揹iffusion equation was employed.