Using simultaneous measurements during photopolymerization to measure relaxation time growth and connection to network clustering

摘要

We have developed a method that shows the necessity of simultaneous measurements during photopolymerization to determine the evolution of relaxation time. Comparison of experiments and numerical simulation showed that a higher curing light intensity increases clustering of the network nodes (monomer units), and subsequently delaying the growth in relaxation time. This method provides new insights for identifying optimal protocols for reducing PS. Due to lack of significant PS and poor signal to noise ratio it was not possible to determine relaxation time for DC below 40 %. But this limit is a function of the curing rate, filler content, and rate constants of the monomers, among other parameters. Thus, it can be possible to determine relaxation time at lower DC for other cases.