Silsesquioxanes functionalized with one or two side-chain amino groups as coinitiators of camphorquinone in photoinitiated polymerization of methacrylate monomers

IGNACIO E. DELL'ERBA; SILVANA V. ASMUSSEN; WALTER F. SCHROEDER; CLAUDIA I. VALLO

JOURNAL OF NANOSTRUCTURED POLYMERS AND NANOCOMPOSITES

ADCOTEC LTD

Lugar: Londres; Año: 2012 vol. 8 p. 119 - 126

1790-4439

Organotrialkoxysilanes (APS-PGE2) and (DAS-PGE3) were synthesized by reacting 1 mole of 3-(aminopropyl)triethoxysilane (APS) with 2 mole of phenylglycidylether (PGE) or 1 mole of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (DAS) with 3 mole of PGE respectively. Polyhedral oligomeric silsesquioxanes functionalized with bulky amino groups (ASSQO) were prepared by hydrolytic condensation of both APS-PGE2 and DAS-PGE3 using formic acid as a catalyst. The polymerization of methacrylate resins photoinitiated by camphorquinone (CQ) in combination with the synthesized ASSQO was investigated. The progress of monomer conversion vs. irradiation time showed that the CQ/ASSQO pair constitutes an efficient photoinitiator system because a fast reaction and high conversion result from 60 s irradiation at 600 mW/cm2. The mechanical behaviour of these systems in flexural and compressive tests was highly dependent on the structure of the ASSQO.