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Development and Study of a Coupling Agent for Photocurable Hybrid Thiol/Ene/Cationic Formulations

✍ Scribed by Ricardo Acosta Ortiz; Aida E. Garcia Valdéz; Lydia Berlanga Duarte; Ramiro Guerrero Santos; Luis Rodolfo Ovando Flores; Mark D. Soucek

Publisher: John Wiley and Sons
Year: 2008
Tongue: English
Weight: 685 KB
Volume: 209
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.200800305

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✦ Synopsis

Abstract

It is demonstrated that the mechanical properties of the resulting polymers can be enhanced by adding a coupling agent to a hybrid thiol/ene/cationic system. The coupling agent was a hybrid monomer with methacrylic and epoxycyclohexyl groups linked by a tetramethyldisiloxane moiety. The methacrylic group of the coupling agent reacted in a first stage with the components of the thiol/ene system obtaining a polymer functionalized with epoxycyclohexyl groups. This polymer could react further with the epoxy monomer of the cationic system to form a copolymer. The viscoelastic properties of the obtained polymers were compared by DMA, finding an increment in the storage modulus of the polymers with the coupling agent, ranging from 18 to 67%.

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## Abstract Novel materials were prepared from dual photo and thermal polymerization of hybrid thiol‐ene/cationic systems. In the first stage, the thiol‐ene system proceeded to high conversions, while the cationic photopolymerization was inhibited. The formation of sulfides during this stage was th