Publication: Ultraviolet curing of acrylic systems: Real-time Fourier transform infrared, mechanical, and fluorescence studies
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2002-12
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Wiley Periodicals, Inc.
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Abstract
The photopolymerization of acrylic-based adhesives has been studied by Fourier transform infrared and fluorescence analysis in real time. Real-time infrared spectroscopy reveals the influence of the nature of the photoinitiator on the kinetics of the reaction. Furthermore, the incident light intensity dependence of the polymerization rate shows that primary radical termination is the predominant mechanism during the initial stages of the curing of the acrylic system with bis(2,4,6-trimethylbenzoyl) phenyl phosphine oxide (TMBAPO) as a photoinitiator. The fluorescence intensity of selected probes increases during the ultraviolet curing of the adhesive, sensing microenvironmental viscosity changes. Depending on the nature of the photoinitiator, different fluorescence&-conversion curves are observed. For TMBAPO, the fluorescence increases more slowly during the initial stage because of the delay in the gel effect induced by primary radical termination. Mechanical tests have been carried out to determine the shear modulus over the course of the acrylic adhesive ultraviolet curing. In an attempt to extend the applications of the fluorescence probe method, we have undertaken comparisons between the fluorescence changes and shear modulus. Similar features in both curves confirm the feasibility of the fluorescence method for providing information about microstructural changes during network formation.
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Keywords
Fuorescence monitoring, Ultraviolet curing, Infrared spectroscopy(FT-IR in realtime), Kinetics (polym.), Adhesives, Mechanical properties
Bibliographic citation
Peinado, C., Salvador, E. F., Alonso, A., Corrales, T., Baselga, J. & Catalina, F., (2002). Ultraviolet curing of acrylic systems: Real-time Fourier transform infrared, mechanical, and fluorescence studies. Journal of Polymer Science, Part A: Polymer Chemistry, 40 (23), pp. 4236–4244.