Study of surface‐functionalized nano‐SiO₂/polybenzoxazine composites

Abstract

A series of the surface-functionalized nanoSiO 2 /polybenzoxazine (PBOZ) composites was produced, and an attempt was made to improve the toughness of PBOZ material, without sacrificing other mechanical and thermal properties. A benzoxazine functional silane coupling agent was synthesized to modify the surface of nano-SiO 2 particles, which were then mixed with benzoxazine monomers to produce the nano-SiO 2 -PBOZ nanocomposites. The notched impact strength and the bending strength of the nano-SiO 2 -PBOZ nanocomposites increase 40% and 50%, respectively, only with the addition of 3 wt % nano-SiO 2 . At the same load of nano-SiO 2 , the nanoSiO 2 -PBOZ nanocomposites exhibit the highest storage modulus and glass-transition temperature by dynamic viscoelastic analysis. Moreover, the thermal stability of the SiO 2 /PBOZ nanocomposites was enhanced, as explored by the thermogravimetric analysis. The 5% weight loss temperatures increased with the nano-SiO 2 content and were from 368 C (of the neat PBOZ) to 379 C or 405 C (of the neat PBOZ) to 426 C in air or nitrogen with additional 3 wt % nano-SiO 2 . The weight residue of the same nanocomposite was as high as 50% in nitrogen at 800 C. V C 2010Wiley Periodicals, Inc. J Appl Polym Sci 120: [1525][1526][1527][1528][1529][1530][1531][1532] 2011

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