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- W2023452605 abstract "Historically, a number of self photo-initiating carbon-carbon double bond (CC) containing monomers have examined during a fairly long period of time with respect to their relative efficiencies in initiating free radical polymerization and these findings are well documented in the literature [[1], [2], [3], [4], [5], [6], [7], [8]]. In this paper, a comprehensive study has been undertaken in investigating the initiating efficiencies of α,β-substituted alkenyl acrylates (X1CC(Y1)COO(X2CCY2)). In order to evaluate the photochemistry involved in the excitation process, focus has been emphasized on vinyl acrylate (VA) as a model compound. VA exhibits fast rates of polymerization and high degrees of conversion are obtained. Real Time Infra Red analysis (RTIR) was used throughout the investigation in recording the kinetics of the homo and co-polymerization of VA and in combinations with various co-monomers in the presence and absence of PhI. In the homopolymerization of VA, the acrylate CC was found to polymerize much faster than the vinyl ester CC. The enhanced reactivity of the acrylate CC in VA is mainly due to the very close proximity of the two CC bonds exhibiting large differences in electron densities over the two CC bonds within the same molecule. Modeling studies are compared to real time recorded kinetics, showing good correlation. Furthermore, a mechanistic investigation of the nature of the excited state conformation in VA also indicates fundamental differences in the “efficiencies of initiation”, which can be caused by a biradical versus a conventional “monoradical” pathway of initiation seen by the use of commercially available PHI's. Finally, useful future implications in the use of VA and derivatives thereof as initiating monomers in practical acrylate based formulations will be discussed in the paper." @default.
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- W2023452605 date "2005-01-01" @default.
- W2023452605 modified "2023-09-27" @default.
- W2023452605 title "Photoinduced free radical polymerization using self-initiating monomers" @default.
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- W2023452605 doi "https://doi.org/10.1016/j.porgcoat.2004.04.003" @default.
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