Dynamic mechanical characterization of epoxy/epoxycyclohexyl–POSS nanocomposites

Influence of the Polyhedral Oligomeric Silsesquioxane n-Phenylaminopropyl - POSS in the Thermal Stability and the Glass Transition Temperature of Epoxy Resin

“…addition of octafunctional POSS containing amine groups can modify the T g and the thermal stability [13][14][15] .…”

“…Figure 4 shows the storage modulus as a function of temperature for the neat epoxy and the nanocomposites containing 1, 2, 5 and 10 wt% of POSS. In the glassy region, the modulus depends on the intermolecular forces, the cohesive energy density, the packing density and the molecular mobility [15] . The addition of POSS promotes an increase in the glassy region that indicates a reinforcement effect may be associated with the values of gel content.…”

“…TEM analysis shows the dispersion of the POSS nanocages in the cured epoxy resin. changes by cooperative segmental motions, but crosslinking prevents any liquid flow [15,28] . In theory, incorporation of reinforcements should result in higher modulus values.…”

“…In theory, incorporation of reinforcements should result in higher modulus values. As the temperature increases, the samples pass through a glass transition region and reach the elastomeric region, where more segments in the chain are moving in a cooperative way [15] . The elastomeric region not shows significantly variations with the presence of POSS.…”

“…The mechanism of diffusion was associated with the increase in the average distance between the chains. The increase in free volume promotes a reduction of the T g [14,15] . On the other hand, the addition of POSS can also promote an increase in T g [7] .…”