The effect of nanofiller on the thermomechanical properties of polyimide/clay nanocomposites

摘要

The interaction between PI and partially exfoliated clay nanofillers is investigated by studying the thermomechanical properties of the resulting nanocomposites by NMR, XPS, XRD, TEM, TGA, TMA, and DMA. XRD and TEM showed more exfoliated structure at <= 2.5 wt.- clay and a macrophase separation above 2.5 wt.- clay. T-d and the storage modulus increased with increasing clay content. A decrease in CTE was observed for clay content <= 2.5 wt.- because of the good dispersion of the clay in the polymer and the reduced segmental motion of polymer matrix. NMR confirmed the quality of clay dispersion, and XPS exhibited that the interaction in PI/2.5 wt.- clay is much stronger than that in PI/5 wt.- clay.