화학공학소재연구정보센터
Polymer, Vol.169, 154-159, 2019
Structure-property-processing relationship of ethanol solvent exchanged PEEK
We introduce a novel method of solvent exchanges and drying poly(ether ether ketone) (PEEK) that result in a hierarchical nanoporous structure. Traditional processing of porous PEEK typically consists of dry mixing with salt beads as porogens and compression molding or employing drying methods of solvent casted PEEK such as freeze- drying or supercritical drying. These processes however come with their drawbacks of either being too expensive or not supporting the porous network throughout the drying process due to solvent crystallization. The fabrication method proposed in this work utilizes ethanol as an intermediate solvent, which coupled with the following drying process provides a gradient porous network through the sample. The PEEK samples displayed mostly nanoporosity with an overall mesoporosity of approximately 2% and a measurable density of 0.84 g/cm(3) +/- 0.18, which is higher than that of aerogels produced using traditional methods. Therefore, the compressive strength displayed by the porous PEEK samples prepared with varying drying methods were higher to that of aerogels prepared through traditional methods. Herein, we show a promising, and relatively inexpensive, alternative method to fabricate mechanically robust porous PEEK with control over structuration, porosity and surface area through ethanol solvent exchange.