Monitoring photocuring

On a more commercial note, articles have appeared on photocurable pressure-sensitive adhesives, trigger curing of epoxy-resins, and development of a photocolorimeter for monitoring cure rates. ... 

Methods for monitoring properties of resins during photocuring continue to... 

The oxidation of lead in various electrolyte solutions has been studied [736-738]. In a tetraborate solution, the photocurrent spectrum measured with white light showed a marked dependence on the positive (anodic) potential limit of the potential scans. With the most positive limit, the photocurrent-potential relationship displayed in Fig. 5.128 was obtained. The formation of tetragonal PbO by reduction of 0 -PbO2 was monitored. The onset of the photocurrent indicates the appearance of the formation of PbO and the electrode potential coincides with the sudden onset of the photocurrent in the anodic scan. In the positive-going scan, the photocur-... 

It is important to monitor photopolymerization reactions as they provide valuable information about the reaction kinetics, which can help optimize photocurable formulations to achieve desired properties, such as structural, physical, and mechanical, in the cured materials. This section provides a detailed summary of the available characterization techniques commonly used to investigate photopolymerization reactions. The parameters that are generally investigated are the rate of polymerization Rp), DC and the amount of RCs, induction period (ti), quantum yield of polymerization, kinetic chain lengths, and gelation time. 

The postpolymerisafion, which is known to occur just after the UV-exposure in cationic photocuring, was easily monitored by RTIR spectroscopy, as shown in Fig. 7 for DVE-3 (dashed curve). It can be seen that, after a 0.7 s exposure to UV-radiation, the vinyl ether continues to polymerise in the dark, the conversion rising from 10% to over 90% within a few seconds. One can take advantage of such an important dark curing process to assemble non-transparent foils by means of... 

Sanchez J, del Valle M (2001) Photocurable ISFET for anionic surfactants. Monitoring of photodegradation processes. Talanta 54 893-902... 

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