Science and Technology Production
Congress
Authorship
Ignacio E. dell'Erba
;
Silvana V. Asmussen
;
SCHROEDER, WALTER FABIAN
;
Claudia I. Vallo
Date
2012
Publishing House and Editing Place
XIII Simposio Latinoamericano de Polímeros - SLAP 2012
Summary
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SIGEVA
Polyhedral oligomeric silsesquioxanes functionalized with amino groups (SSQO) were prepared by a two-stage synthesis procedure. First, a modified organotrimethoxysilane was synthesized by reacting 1 mole of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane with 3 mole of 1,2-epoxy-3-phenoxypropane and then the hydrolytic condensation of the modified silane catalyzed by formic acid. Methacrylate resins were activated for visible light polymerization by the addition of Camphorquinone (CQ)...
Polyhedral oligomeric silsesquioxanes functionalized with amino groups (SSQO) were prepared by a two-stage synthesis procedure. First, a modified organotrimethoxysilane was synthesized by reacting 1 mole of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane with 3 mole of 1,2-epoxy-3-phenoxypropane and then the hydrolytic condensation of the modified silane catalyzed by formic acid. Methacrylate resins were activated for visible light polymerization by the addition of Camphorquinone (CQ) in combination with different mass fractions of SSQO. A clean and rapid photobleaching of the CQ/SSQO pair was observed upon irradiation of methacrylate resins. This makes the CQ/SSQO photoinitiator system very attractive for polymerization of thick sections. The progress of monomer conversion vs. irradiation time showed that the CQ/SSQO pair is an efficient photoinitiator system because a fast reaction and high conversion. Moreover, it was found that up to 22 wt% SSQO could be incorporated in the methacrylate resin without compromising the flexural or the compressive properties of the final material.
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Key Words
MECHANICAL PROPERTIESSOL-GEL GROWTHNANOSTRUCTURESPOLYMERS