Ternary hybrid material formation by twin polymerization coupled with the bis-epoxide/amine step growth polymerization

Abstract

Homogeneous hybrid materials composed of phenolic resins, crosslinked polydialkylsiloxane moieties with linear epoxide/amine composites have been synthesized by twin polymerization of 2-(3-amino-n-propyl)-2-methyl-4H-1,3,2-benzodioxasiline (APSI) combined with addition polymerization of bisphenol-A-diglycidylether (BADGE). The ternary formation of three different polymer structures within one procedure in the melt process occurs smoothly as evidenced by solid state 13C and 29Si NMR spectroscopy. The formation of in situ generated twin monomer moieties with higher functionalities f = n • 2 (n > 2, n is the assumed average degree of polymerization of the linear chain fragments resulting intermediately from APSI and BADGE), compared to the primary reactant APSI (f = 2, n = 1), triggers the polysiloxane network formation. A novel type of polysiloxane resin is produced by this methodology. Highly thermally stable materials are accessible by appropriate adjustment of reaction conditions and the molar ratio of the reactants. Potential applications are inter alia in the field of glue adhesives, veneers, and casting resins.