Synthesis and Characterization of a Hybrid Material Based on a Trimethoxysilane Functionalized Benzoxazine

MARISA SPONTÓN; DIANA ESTENOZ; G. LLIGADAS; J. C. RONDA; M. GALIÀ; V. CÁDIZ

JOURNAL OF APPLIED POLYMER SCIENCE

JOHN WILEY & SONS INC

Lugar: New York; Año: 2012 vol. 126 p. 1369 - 1376

0021-8995

A polybenzoxazine / polysiloxane hybrid has been prepared by sol-gel process and ring-opening polymerization. For this purpose, first a functionalized benzoxazine was synthesized from bisphenol A, paraformaldehyde and 3-(trimethoxysilyl) propylamine, with initial molar ratio 1:4:2, and 95% yield. Thestructure of the monomer was characterized by Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR). The sol-gel process and curing behavior have been studied by FTIR spectroscopy and Differential Scanning Calorimetry (DSC). The Dynamic Mechanical Analysis (DMTA) of the hybrid material (Bz-PSi) showed higher Tg and storage modulus respect to the conventional polybenzoxazine (Bz-BA). Also, the Thermogravimetric Analysis (TGA) revealed a better thermal stability. The high Limiting Oxygen Index (LOI) values (about LOI = 32) confirmed similar effective flame retardance properties of the hybrid material respect to conventional benzoxazine.