自由基型紫外光固化氧阻聚作用的定量描述

Quantitative description of oxygen inhibition in radical UV-curing

基于自由基型光固化过程一般由多个活性中心引起的考虑,利用分峰的方法对光固化速率曲线进行多峰拟合,同时定义速率曲线上拐点处的切线与时间轴的交点横坐标tV-inh作为一个光固化时间参数,来研究氧气的阻聚作用效果。通过对光固化参数与引发剂含量进行拟合分析,定量地考察了分峰分析方法及所选择的参数用以描述氧阻聚的可行性。结果表明,分峰可以清晰地分离出对氧气较敏感的固化反应部分,tV-inh与引发剂含量x的关系可用函数模型tV-inh=A/x+B进行表达,(A+B)值的大小可以定量地反映固化体系对氧气的敏感程度。

Curing rate curve was multimodally fitted by the peak separation method based on the consideration that free radical UV-curing process is generally caused by multiple active centers.A parameter of tV-inh,which is the intersection of abscissa and the tangent line of the inflection point of curing rate curve,is assigned to evaluate oxygen inhibition extent.The results showed a more oxygen-sensitive curing reaction could be isolated by overlapping peak resolving,and the relationship between tV-inh and initiator content x turned out to be fulfilled the algebraic expression of tV-inh=A/x+B optimally,and the value of(A+B)could be used to describe the oxygen inhibition trend for a given curing formula.