Octaaminophenyl(T8)POSS [1, (C6H4NH2)8(SiO1.5)8] and dodecaaminophenyl(T12)POSS [2, (C6H4NH2)12(SiO1.5)12] were synthesized, characterized and then incorporated into two types of thermoset resins: (1) the bisphenol-F-based cyanate ester resin, PT-15, and (2) epoxy (Epon 828, Shell Chemical Corp.)/4,4′-diaminodiphenylmethane (DDM) resin, respectively, to make two series of nanocomposites. The sum of amino groups in both DDM and POSS were held in a 1:1 mole ratio to the epoxy groups. EPON-828/1/DDM and EPON-828/2/DDM composites (78.63/0/21.37, 77.48/5/17.52, 76.34/10/13.66, 74.05/20/5.95 and 72.28/27.72/0 wt/wt/wt compositions for both series) were prepared. PT-15/1 and PT-15/2 composites (99/1, 97/3 and 95/5 wt/wt compositions for both types) were also prepared. These nanocomposites were characterized by transmission electron microscopy (TEM), dynamic mechanical analysis (DMA), solvent extraction and FT-IR. In all systems, POSS 1 and 2 were chemically bound into the resin matrix and phase-separated POSS particle domains were not observed. Incorporation of both 1 and 2 can dramatically elevate the high temperature bending storage moduli, E′, of epoxy resins.
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Acknowledgments
We thank Dr. Andre Lee, Michigan State University for assistance in performing a portion of the DMA studies and helpful discussions. This work was supported by the Air Force Office of Scientific Research (grant no. F49620-02-1-026-0) and the National Science Foundation (grant no. EPS0132618).
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Cho, H., Liang, K., Chatterjee, S. et al. Synthesis, Morphology, and Viscoelastic Properties of Polyhedral Oligomeric Silsesquioxane Nanocomposites with Epoxy and Cyanate Ester Matrices. J Inorg Organomet Polym 15, 541–553 (2005). https://doi.org/10.1007/s10904-006-9008-0
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DOI: https://doi.org/10.1007/s10904-006-9008-0