期刊
HIGH PERFORMANCE POLYMERS
卷 25, 期 1, 页码 87-96出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0954008312457192
关键词
epoxy resin; cyanate functionalized polyhedral oligomeric silsesquioxane (POSS)-nano composites; thermal and mechanical properties
资金
- University Grant Commission (UGC), New Delhi, India
- Council of Scientific and Industrial Research (CSIR), New Delhi, India
A new cyanate ester functionalized polyhedral oligomeric silsesquioxane (POSS-Cy) monomer was prepared by reacting hydroxyl functionalized POSS-OH with cyanogen bromide (CNBr) in the presence of triethylamine (Et3N). The precursor POSS-OH and the corresponding cyanate ester POSS-Cy were characterized by Fourier transform infrared (FTIR), H-1 and C-13 nuclear magnetic resonance (C-13-NMR) spectral techniques. Nanocomposites were prepared by reacting diglycidylether of bisphenol-A, POSS-Cy and 4,4'-diaminodiphenylmethane (DDM). The structure of the cross-linked networks was confirmed by FT-IR. The POSS particles formed clusters in some regions leading to phase separation as revealed by scanning electron microscopy (SEM) analysis. Dynamic mechanical analysis (DMA) shows that the glass transition temperature decreases from 161 degrees C to 155 degrees C when the POSS-Cy content was increased from 0% to 15%. But, the T10% of the epoxy resin (369 degrees C) increased significantly (404 degrees C) on incorporating 15% of POSS-Cy. The LOI values indicate that these blends have good flame-retardant properties.
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