Hybrid photopolymerization has the potential to solve the oxygen and moisture inhibition problem that plagues free radical and cationic photopolymerization reactions, respectively. The problem, however, with the hybrid system is the deficiency in fundamental knowledge of the reaction in the system. This project aims to address these shortcomings by studying hybrid systems in order to understand how experimental variables influence 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 by the Raman spectroscopy method. Model of the diffusion effect of oxygen in hybrid systems. An oxygen diffusion model incorporating energy balance, species balance and light attenuation parameters will be developed. Reduce oxygen diffusion in hybrid monomer films through variable formulation and processing selections. The hybrid monomer molecule and the monomer mixture will be polymerized to obtain the conversion profile; the treated sample will be studied to obtain the conversion of the functional group as a function of depth by Raman spectroscopy and microscopy respectively. The physical properties of the resulting product will be checked in order to determine the product with the least oxygen diffusion. 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 investigated in Objective three.IV. Overview of the research planA series of hybrid systems will be considered in this study; the monomers of these systems will have different functionalities present, such as those in Figure 5. Hybrid monomer molecule, i.e. a single monomer molecule with two moieties (such as acrylate and epoxide) and hybrid blend formulation that will contain separate molecules for each moiety (i.e. the acrylate will be mixed with the epoxy). The photoinitiator systems for this study will be expanded to include α-cleavable free radical photoinitiators, such as dimethoxyphenylacetophenone (DMPA) shown in Figure 1, and cationic photoinitiator salts as shown in Figure 3. Raman spectroscopy will be used for in situ investigations of polymerization of the samples. Raman microscopy will be used to obtain conversion profiles of functional groups at various depths. These methods are based on a non-destructive Raman scattering technique that provides information on the vibrational and electronic states in a confined system.{{8 Cai,Ying 2006}} The method is particularly suitable for the detection of chemical bonds and their changes during reaction.B. Objective n.1 Kinetic study of hybrid systems