Synthesis and characterization of polybenzoxazine/silica‐based hybrid nanostructures for flame retardancy applications

FORCHETTI CASARINO, AGUSTIN; CASIS, NATALIA; ESTENOZ, DIANA A.; SPONTÓN, MARISA E.

POLYMER ENGINEERING AND SCIENCE

JOHN WILEY & SONS INC

Año: 2022

0032-3888

The objective of this study is to develop polybenzoxazine-silica nanocompositesystems endowed with greater thermal and fire performance. For this purpose,the 3-aminopropyltrimethoxysilane and bisphenol A-based benzoxazine(BA-3aptms) was synthesized. Also, smooth and spherical silica nanoparticles of50 nm size were prepared following the Stöber´s method. The influence of thenanoparticle size and geometry on the properties (laminar morphology, thermal,dynamic-mechanical, hydrophobicity, and flame retardancy) of the polybenzoxazine/polysilsesquioxane material was investigated. Also, nanocompositesfrom the conventional benzoxazine (BA-a) and SiO2 nanoparticles were synthesized for comparative purposes. The addition of nanoparticles in bothpolybenzoxazines improved the mechanical, thermal and flammability properties. Likewise, the presence of these nanoparticles conferred to the material amore hydrophobic surface (contact angle around 95). Particularly, the Pr(BA3aptms)/NP nanocomposites presented better properties than the BA-a-basedsystems, due to the presence of laminar-oriented polysilsesquioxane networkschemically bonded to the silica nanoparticles at nanoscale