An analysis of photopolymerization kinetics and stress development in multifunctional acrylate coatings
An analysis of photopolymerization kinetics and stress development in multifunctional acrylate coatings
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DOI：
10.1002/pen.10731
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发表时间：
2001-02-01
影响因子：
3.2
通讯作者：
Stidham, HD
中科院分区：
文献类型：
--
作者：
Stolov, AA;Xie, T;Stidham, HD
采用悬臂梁偏转法和真实的时间一次反射红外光谱法研究了多功能丙烯酸酯涂料的聚合动力学和应力积累。由于膜中的应力积累而引起的悬臂偏转与聚合物质中的交联密度相关。观察到应力积累不是在引入辐射后立即发生，而是在一定时间间隔后发生。聚合开始和应力指示开始之间的时间延迟归因于交联的引入，导致凝胶状态。所测得的应力转换关系，可以预测使用的方法，将单体反应概率。应力积累可作为处理条件的函数而显著变化，所述处理条件例如膜厚度、固化点处的温度以及控制交联度的光引发剂的类型、浓度和吸收率。在某些加工条件下，膜中单体转化率的不均匀分布可能严重改变应力-膜厚度关系。在某些情况下，悬臂材料的各向异性可以基于所测量的悬臂偏转来检测。
Polymerization kinetics and stress buildup of multifunctional acrylic coatings have been studied simultaneously using a cantilever deflection method and real time one-bounce infrared reflectance spectroscopy. Cantilever deflection due to stress buildup in the film is correlated with crosslink density in the polymerizing mass, Stress buildup was observed not to occur instantaneously after radiation was introduced but rather after a certain time interval. The time delay between onset of polymerization and initiation of stress indication is attributed to the introduction of crosslinks, leading to a gel state. The measured stress-conversion relationship can be predicted using an approach incorporating monomer reaction probability. Stress buildup can vary considerably as a function of processing conditions such as film thickness, temperature at solidification point, and the type, concentration and absorptivity of photoinitiator, which govern the degree of crosslinking. Under certain processing conditions, an uneven distribution of the monomer conversion in the film may severely alter the stress-film thickness relationship. in some cases the cantilever material anisotropy can be detected based on the cantilever deflection measured.