writer：Jie Li1, Zhong Zeng2, Huawei Zou 1*, Mei Liang1, Yang Chen1*
keywords：Polyurethane, Epoxy resins, OMMT, Nanocomposites, Phase morphology
source：期刊
specific source：Journal of Polymer Research, 2016, 23(10): 213.
Issue time：2016年

Abstract Organic montmorillonite (OMMT) modified polyurethane (PU) /epoxy resin (EP) (OMMT-PU/EP) graft interpenetrating polymer network nanocomposites with different content of OMMT were prepared. The effect of the OMMT content on the phase behavior of the PU/EP IPN system has been studied by Dynamic mechanical analysis (DMA). With the content of OMMT increased, the tan δ turned from single peak to two peaks and the damping temperature range became wider when the isocyanate index is low. Transmission electron microscope (TEM) and atomic force microscope (AFM) results showed that high content of OMMT favored phase separation to form a larger-size domain in nanocomposites, resulting in the broadening of damping temperature range. This work demonstrates that we can control phase behaviour of OMMT-PU/EP IPNs by changing the OMMT content. This result provides potential opportunity for this type of materials to be used as sound and vibration damping polymers over wide temperature ranges.