285392 Epoxy Nanocomposites Reinforced with Soft and Hard Nanoparticles

Tuesday, October 30, 2012: 5:25 PM
Butler East (Westin )
Xi Zhang1, Johnnie Stewart IV1, Sowjanya B. Rapole1, Suying Wei2 and Zhanhu Guo3, (1)Integrated Composites Laboratory (ICL), Dan F Smith Department of Chemical Engineering, Lamar University, Beaumont, TX, (2)Chemistry and Biochemistry, Lamar University, Beaumont, TX, (3)Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont, TX

Epoxy resin nanocomposites reinforced with both soft (polyaniline (PANI)) and hard (barium titanate (BaTiO3)) nanoparticles are studied and compared with each other. For epoxy with PANI nanocomposites, both nanoshpere and nanofiber are applied to explore the morphology effect; and for epoxy nanocomposites with BaTiO3 nanoparticles, the nanoparticle size (500 and 100 nm) effect on the nanocomposites is also studied. In addition, in order to improve the interfacial interaction between inorganic BaTiO3 nanoparticle and organic epoxy resin, BaTiO3 nanoparticles coated with PANI layer is synthesized, the amino group of PANI can react with epoxy monomer and improve the dispersion of the BaTiO3 nanoparticle in epoxy resin. For all the series of samples, mechanical properties, rheological property, thermal stability, electrical conductivity and dielectric property are systematically studied. The Rheology test is based on liquid sample and reduced viscosity is observed in both PANI and BaTiO3 samples at lower loading, and at higher loading, the viscosity increases with the loading increase. PANI as the soft nanofillers can increase the conductivity of matrix, and at same loading, epoxy with PANI nanofibers has lower volume resistance than epoxy with nanospheres, which is resulting from the contact resistance and a 3-d variable range hopping (VRH) electron transport mechanism. The dielectric property test indicates nanocomposites with both soft and hard nanofiller have higher real permittivity and less dielectric loss than those of pure epoxy. And the highest real permittivity is observed in epoxy with BaTiO3 nanoparticle coated with PANI layer sample, the high real permittivity may be associated with the ferroelectric nature of BaTiO3 and the space charge at the interface between BaTiO3 and PANI.

Extended Abstract: File Not Uploaded
See more of this Session: Nanoscale Phenomena in Macromolecular Systems
See more of this Group/Topical: Materials Engineering and Sciences Division