Selected epoxy-functionalized cube nanocomposites were prepared from octa(aminophenyl)silsesquioxane (OAPS), poly(aminophenyl)silsesquioxane (PAPS), octa(dimethylsiloxypropylglycidyl ether) silsesquioxane (OG), diglycidyl ether of bisphenol A (DGEBA) and diaminodiphenylmethane (DDM). A systematic comparison of properties was conducted using GPC, FTIR, 29 Si NMR, TGA, and DMA. In these studies, we find that (1) tethers with aromatic components increase char yields and decomposition temperatures, (2) cube loadings are important in thermal stabilities, (3) aromatic tether structure, short lengths and high cross-link densities reduce tether segmental relaxation motions which in turn stiffen the network and minimize macroscopic glass transitions. Finally, nanocomposites prepared from OAPS and PAPS exhibit nearly identical thermomechanical properties with PAPS offering a low cost alternative to OAPS.
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Choi et al. (2003) studied this question.
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