Effect of introducing a cationic system into a thiol‐ene photopolymerizable formulation |
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| Authors: | Ricardo Acosta Ortiz Bertha A Puente Urbina Liliana V Cabello Valdez Lydia Berlanga Duarte Ramiro Guerrero Santos Aída E García Valdez Mark D Soucek |
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| Institution: | 1. Centro de Investigación en Química Aplicada, Blvd Enrique Reyna #140, 25100 Saltillo, Coahuila, MéxicoCentro de Investigación en Química Aplicada, Blvd Enrique Reyna #140, 25100 Saltillo, Coahuila, México;2. Centro de Investigación en Química Aplicada, Blvd Enrique Reyna #140, 25100 Saltillo, Coahuila, México;3. Facultad de Ciencias Químicas de la UAdeC, Bolvd Venustiano Carranza e Ing José Cárdenas, 25000 Saltillo, Coahuila, México;4. Department of Polymer Engineering, University of Akron, Akron, Ohio 44325 |
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| Abstract: | Hybrid materials derived from a thiol‐ene and cationic polymerization were obtained from concomitant polymerization. The hybrid materials were cured by both photopolymerization and thermally induced polymerization. The kinetics of the photopolymerization were measured using time resolved‐IR and optical pyrometry. The nucleophilic character of the polysulfide obtained initially in the thiol‐ene polymerization inhibited the development of the cationic photoinitiated polymerization of epoxy monomers. Besides, the epoxide groups underwent a proton catalyzed addition reaction with the thiols to form new sulfides groups in the reaction mixture. It is proposed that the formed sulfides can terminate the growing polyether chains forming dormant species like trialkylsulfonium salts. These salts promote the thermal polymerization of the epoxy monomer in a post treatment, producing hard and transparent materials. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4829–4843, 2007 |
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| Keywords: | cationic cationic polymerizations hybrid kinetics kinetics (polym) photopolymerization thiol‐ene |
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