Effect of Surface Functionalization on the Properties (Rheological, Mechanical, and Dielectric) and Microtopography of PEN/CPEN-f-CNTs Nanocomposites

摘要

Novel carboxylic poly(arylene ether nitrile)s (CPEN) functionalized carbon nanotubes (CPEN-f-CNTs) were successfully prepared by a simple and effective solvent-thermal route. The CPEN-f-CNTs were subsequently used as the novel filler for preparation of high performance poly(arylene ether nitrile) s (PEN) nanocomposites. The SEM characterization of the PEN nanocomposites revealed that the CPEN-f-CNTs present better dispersion and interfacial compatibility in the PEN matrix, which was confirmed by the linear rheological analysis (Cole-Cole plots) as well. Consequently, the improved thermal stability (increased initial and maximum decomposition temperature) and enhanced mechanical properties (tensile strength and modulus) were obtained from nanocomposites using CPEN-f-CNTs. More importantly, the PEN/CPEN-f-CNTs nanocomposites not only show a high dielectric constant but also have low dielectric loss. For example, a dielectric constant of 39.7 and a dielectric loss of 0.076 were observed in the PEN composite with 5 wt% CPEN-f-CNTs loading at 100 Hz. Therefore, the flexible PEN/CPEN-f-CNTs nanocomposites with outstanding mechanical, thermal and dielectric properties will find wide application in the high energy density capacitors. (C) 2015 Society of Plastics Engineers