KINETIC APPROACH OF O-2 INHIBITION IN ULTRAVIOLET-INDUCED AND LASER-INDUCED POLYMERIZATIONS
KINETIC APPROACH OF O-2 INHIBITION IN ULTRAVIOLET-INDUCED AND LASER-INDUCED POLYMERIZATIONS
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DOI：
10.1021/ma00148a034
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发表时间：
1985-01-01
期刊：
影响因子：
5.5
通讯作者：
JENKINS, AD
中科院分区：
文献类型：
--
作者：
DECKER, C;JENKINS, AD
用红外光谱法研究了氧对多丙烯酸酯体系光聚合的阻聚作用。常规和激光UV照射都用于引发反应;在4个数量级范围内跟踪光强度对聚合动力学的影响。基于简单的动力学方案，计算了O2的稳定浓度方程作为引发速率和有氧和无氧聚合速率比的函数;在所采用的条件下，发现[O2] a值约为5 × 10 - 6 mol L-1。抑制期对倒数光强度的小于一阶依赖性表明，O2被链过氧化过程消耗，动力学链长在1.6和16之间，取决于光强度。
The inhibition by oxygen of the photopolymerization of multi-acrylate systems was investigated by IR spectroscopy. Both conventional and laser UV irradiations were used to initiate the reaction; the effect of the light intensity on polymerization kinetics was followed over a 4-orders-of-magnitude range. Based on a simple kinetic scheme, theequation of the steady concentration of 02 was calculated as a function of the initiation rate and of the ratio of the polymerization rates with and without oxygen; under the conditions employed, the [02] a value was found to be on the order of 5 X 10™ 6 mol L™ 1. The less-than-first-order dependence of the inhibition period on the reciprocal light intensity indicates that 02 is consumed by a chain peroxidation process with kinetic chain lengths between 1.6 and 16, depending on the light intensity.