The patent relates to the preparation of highly porous materials with multi-level controlled pore size and interconnected pores.
F.33 Slovenian patent
COBISS.SI-ID: 21691926Invited lecture given at Slovenian chemical society meeting regarding combined techniques of phisical - chemistry for the preparaion of multi level porous polymer materials.
B.04 Guest lecture
COBISS.SI-ID: 21742614Zeta potential analysis reveals the changes on the membrane surface charge by fouling during filtration process. In this work, the zeta potential of different new and fouled membranes was determined from streaming potential measurements. The zeta potential of thin-film composite (TFC) polyamide membranes for nanofiltration and reverse osmosis was studied at different pH value. Such membranes typically show a highly negative zeta potential at pH 6-8. After the filtration process, the decrease in the negative zeta potential indicates the decomposition of a foulant layer on the membrane surface.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 22941462Various polymerisation processes and techniques for achieving porosity of organic porous materials have been reported. Among others, porous materials can be prepared by the polymerisation of high internal phase emulsion (HIPE). Such emulsions result after curing in highly porous polymers (polyHIPEs) with open cellular porous morphology. Herein, we report the preparation of monoliths via the polymerization of high internal phase emulsions consisting of 2-hydroxyethyl methacrylate (HEMA) as the functional monomer and N,N'-methylenebisacrylamide (MBAA) as the crosslinker. Poly(HEMA-co-MBAA) material was additionally crosslinked through radical-mediated thiol-ene/yne addition and an increase of specific surface area was observed. Such polyHIPEs were an ideal support for the immobilization of gold nanoparticles.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 21493782PolyHIPEs are macroporous polymeric materials prepared by polymerising the monomer containing continuous phase of an emulsion with a volume fraction of the droplet phase tipically higher than 70 vol%. Two levels of pores are created, namely primary pores in the place of the droplets of emulsion and secondary pores created by the shift in density during the polymerisation. Both levels of pores are in the macro size range with diameters between 100 nm and 100 µm while the approach results in a creation of an interconnected cellular structure. In order to induce meso and micro pores in a polyHIPE material, a post polymerisation crosslinking, usually termed hypercrosslinking, can be used. Thus, a polymeric material with two distinct levels of pore sizes can be prepared. We show the preparation of 4-vinylbenzyl chloride based polyHIPEs subsequently hypercrosslinked using a Friedel-Crafts reaction. Surface area increased dramatically after the hypercrosslinking showing the introduction of meso and micro pores. After the hypercrosslinking, the remaining chloromethyl groups were functionalised with tris(2-aminoethyl)amine in order to introduce a dendritic handles of amino groups for the initiation of the surface-from type of grafting. RAFT agent was immobilised to the surface amino groups and subsequently glycidyl methacrylate (GMA) was polymerised from the surface introducing grafts of polyGMA creating a high density functional polymer and incorporated in a monolith with high porosity and large primary pores for easy flow of solution and better accessibility of reactive sites. FT-IR spectroscopy, micro elemental analysis, high resolution scanning electron microscopy and gravimetry were used to characterise porous polymeric materials.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 22211094