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Study of surface‐functionalized nano‐SiO 2 /polybenzoxazine composites
Author(s) -
Yan Chun,
Fan Xinyu,
Li Juan,
Zhiqi Shen Shirley
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33383
Subject(s) - nanocomposite , materials science , thermal stability , composite material , dynamic mechanical analysis , thermogravimetric analysis , nano , glass transition , toughness , silane , chemical engineering , polymer , engineering
A series of the surface‐functionalized nano‐SiO 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 nano‐SiO 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. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011