RT Journal Article
T1 Ultraviolet curing of acrylic systems: Real-time Fourier transform infrared, mechanical, and fluorescence studies
A1 Peinado Margalef, Carmen
A1 Salvador, Enrique F.
A1 Alonso Gutiérrez, Asunción
A1 Corrales Viscasillas, Teresa
A1 Baselga Llidó, Juan
A1 Catalina Lapuente, Fernando
AB 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.
PB Wiley Periodicals, Inc.
SN 0887-624X
YR 2002
FD 2002-12
LK https://hdl.handle.net/10016/25842
UL https://hdl.handle.net/10016/25842
LA eng
NO The authors thank the Union European Commission for funding through the BRITE-Euram Project (BE97-4472). Gratitude is also extended to Plan Nacional I+D+I (Ministerio de Ciencia y Tecnología) for its financial support (MAT2000-1671) and to Comunidad Autónoma de Madrid (07N/0002/1998). The authors thank K. Dietliker (Ciba Specialty Chemicals) for providing the photoinitiators and Loctite España for providing the adhesives.
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RD 1 sept. 2024