Hybrid photopolymerization has the potential to solve the problem of oxygen and humidity inhibition that plagued free radical and cationic photopolymerization reactions, respectively. The problem, however, with the hybrid system lies in the lack of fundamental knowledge about the reaction in the system. This project aims to address these deficiencies by studying hybrid systems to understand how experimental variables affect sensitivity to oxygen, humidity and alcohol. This understanding will be archived by the following objectives: Determine kinetic rate constants for hybrid systems. The kinetic rate constant, activation energy and Arrhenius constant of the hybrid systems will be obtained from the Raman spectroscopy method. Model of oxygen diffusion effect in hybrid systems. systems. An oxygen diffusion model will be developed integrating energy balance, species balance and light attenuation parameters. Reducing oxygen diffusion in hybrid monomer films through variable formulation and processing selections. The hybrid monomer molecule and monomer mixture will be polymerized to obtain the conversion profile. ; The healing sample will be studied to obtain functional group conversion as a function of depth by Raman spectroscopy and microscopy respectively. The physical properties of the product obtained will be checked in order to determine the product which diffuses the least oxygen. Develop practical formulations of hybrid monomers for industrial applications. Hybrid systems that can be replicated on an industrial scale will be formulated. These systems will be suggested based on availability, cost and resulting physical properties displayed as studied in objective three.IV. Research PlanA OverviewIn this study, a series of hybrid systems will be considered; monomers in these systems will have different functionalities, such as those in Figure 5. Hybrid monomer molecule, that is, a single monomer molecule with two moieties (such as acrylate and epoxy) and one hybrid blend formulation that will contain separate molecules for each fragment (i.e. acrylate will be mixed with epoxy). The photoinitiator systems for this study will be expanded to include an α-cleavable radical photoinitiator, such as dimethoxyphenylacetophenone (DMPA) shown in Figure 1, and cationic photoinitiator salts, as shown in Figure 3. Raman spectroscopy will be used to an in situ investigation. polymerization of the samples. Raman microscopy will be used to obtain functional group conversion profiles at different depths. These methods are based on a non-destructive Raman scattering technique which provides information on the vibrational and electronic states in a confined system. {{8 Cai, Ying 2006}} The method is particularly well suited to the detection of chemical bonds and their modifications during reaction.B. Objective n°1: Kinetic study of hybrid systems