含氧光敏引发体系的研究——Ⅰ.二苯酮/三乙胺/氧体系引发甲基丙烯酸甲酯光聚合反应动力学的研究

对二苯酮(BP)/三乙胺(TEA)/氧体系光敏引发甲基丙炜酸甲酯聚合反应动力学进行了研究。实验结果表明: 、 R_p=KBP]~(0.25)TEA]~(0.25)MMA]O_2]I_0]~(0.5) 当光敏引发体系的浓度较大时,上述动力学关系发生偏离,认为这是由于笼脱活效应和消光副产物剧增的缘故。体系中氧的加速作用使聚合速度提高1.4倍,量子效率达4.4×10~2。

STUDY OF THE PHOTOSENSITIZED INITIATION SYSTEMSCONTAINING OXYGEN——Ⅰ. Kinetic Study of Photopolymerization of MMA Intiated by Benzophenone/Triethylamine/Oxygen System

Kinetic studies were carried out on the polymerization of MMA photo-initiated by benzophenone/triethylamine/oxygen (BP/TBA/O2) system. Experimental results shown that the rate of polymerization is directly proportional to BP]0.25 TEA]0.25 MMA] O2] and I0]0.5. Some deviation from this relationship has been found in case of too high concentrations of photosensitized initiation system. This may be attributed to the strong enhancing cage deactivation and extinction of the intermediate products. The accelerating effect of oxygen in this system resulted an increase in the rate of polymerization to 1.4 times and a quantum yield to 4.4×102.