Effect of polyHIPE porosity on its hydrodynamic properties. (January 2021)

• Record Type: Journal Article
• Authors: Mravljak, Rok; Bizjak, Ožbej; Podlogar, Matejka; Podgornik, Aleš
• Is Part Of: Polymer testing. Volume 93(2021)
• Publication Date: 2021-01
• Subjects: PolyHIPE -- Pore size distribution -- Hydrodynamics -- Permeability -- Pressure drop; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2020.106590
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: Several polymerized high internal phase emulsions (polyHIPE) of various porosity but the same pore diameter were prepared. It was demonstrated that the pore size distribution of void pores and interconnecting pores is similar and it can be described by a log-normal distribution. Flow-through porosity matches closely static porosity and the non-polymerizable fraction of initial emulsion, demonstrating an open structure of polyHIPE that allows flow through the entire porous polymer. Pulse response experiments demonstrated flow uniformity. Pressure drop analysis allowed estimation of porosity effect on permeability. Fitting of experimental data with different pressure drop models revealed that interconnecting pore diameter should be used as a characteristic dimension to describe pressure drop on polyHIPE accurately. Linear correlation between permeability and flow-through porosity demonstrated that the effect of the porous polymer structure on the flow properties is independent of porosity. This finding suggests that polyHIPE hydrodynamics does not change with porosity, facilitating prediction of their performance for various applications where flow-through mode is important. Highlights: Porosity change of polyHIPE with the same pore sizes correlated with pressure drop. Photocurable poly(GMA–EGDMA) columns with 75, 80, 85 and 90% porosities prepared. Void and interconnected/window pore size measured with ellipses from SEM in ImageJ. Pulse experiments for convective flow-through polymer performed for hydrodynamics. Pressure drop data was evaluated with Happel, modified Happel, TSC and RUC model.