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Studies on thermal and dielectric properties of organo clay and octakis (dimethylsiloxypropylglycidylether) silsesquioxane filled polybenzoxazine hybrid nanocomposites
Author(s) -
Vengatesan M.R.,
Devaraju S.,
Dinakaran K.,
Alagar M.
Publication year - 2011
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.21177
Subject(s) - organoclay , materials science , thermogravimetric analysis , silsesquioxane , nanocomposite , dielectric , polymerization , scanning electron microscope , thermal stability , composite material , fourier transform infrared spectroscopy , polymer chemistry , chemical engineering , polymer , optoelectronics , engineering
Abstract Two types of polybenzoxazine (PBZ) hybrid nanocomposites were prepared from new type of benzoxazine monomer (BZ‐Cy‐OH) and organo‐modified MMT clay (OMMT) and octakis (dimethylsiloxypropylglycidylether) silsesquioxane (OG‐POSS) (up to 7.5 wt%). The new BZ‐Cy‐OH prepared from trans ‐4‐aminocyclohexanol hydrochloride and 37% formaldehyde solution with 1,1‐bis (3‐methyl‐4‐hydroxy phenyl) cyclohexane and its structure was conformed by FTIR and NMR ( 1 H and 13 C) spectral studies. The thermal properties of the resulting hybrid PBZ nanocomposites were studied by using differential scanning calorimetric and thermogravimetric analysis. Comparative study revealed on the data from the DSC analysis, the newly synthesized BZ‐Cy‐OH started ring opening polymerization at the lower temperature than that of the conventional benzoxazine (Ba‐A). The dispersion of OMMT clay in the PBZ was confirmed by X‐ray diffraction analysis. The homogeneous morphology of the hybrid nanocomposites was studied by using scanning electron microscope and transmission electron microscope analysis. By comparing the dielectric properties of organoclay and POSS filled PBZ nanocomposites, it was observed that the POSS filled PBZ showed low dielectic constant and in the case of organoclay filled PBZ possessed high dielectric constant. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers