Preparation of PEEK/MWCNT nanocomposites via MWCNT-induced interfacial crystallization mediated compatibilization

Abstract

Polymer nanocomposites based on high melting temperature semi-crystalline polymers are difficult to prepare because of the limited means available to achieve good nanoparticle dispersion for greatly improved properties. In this study, we demonstrate an alternative strategy for preparation of high-performance PEEK/MWCNT nanocomposites via an interfacial crystallization approach. The utilization of polyetheretherketimine (PEEKt) to prepare PEEK nanocomposites eliminates the difficult solvent issues and enables solution mixing and subsequent crystallization of PEEK on MWCNTs. This strategy facilitates a homogeneous dispersion of pristine MWCNTs into the PEEK matrix without any need of surfactant or compatibilizer. Upon drying, the PEEK/MWCNT powder were then molded into various dimensions for mechanical property measurements. As expected, significant improvements are realized. The PEEK/MWCNT nanocomposites that exhibit good dispersion of MWCNT in PEEK are ideal for applications in energy production field, electrochemical devices, and coatings under harsh conditions.