Enhancement of CO2 gas adsorption of Highly porous material from poly(DVB)polyHIPE by using Layer-by-Layer Surface

Abstract

PolyHIPE is a highly porous polymer synthesized from high internal phase emulsions using polystyrene (S) and polydivinylbenzene (DVB). The surface of polyHIPE was modified by Layer-by-Layer (LbL) technique by using alternate deposition. This technique consisted of two main layers, the primary layer was repeated until six layers of poly (diallyldimethylammonium chloride) and poly (styrene sulfonate), polycation and polyanionic, respectively. The secondary layer, which used as CO₂ adsorping layer, was the solution of polyethylenimine (PEI) and tetraethylenepentamine (TEPA). In this experiment, polyHIPE were prepared with ratios of S: DVB were varied by 0:100, 80:20, and 20:80. Pore diameter of the prepared Poly(S/DVB)HIPE were determined and found to be decreased from 79.4 to 41.2 µm with increased amount of DVB used. Moreover, the compressive modulus and decomposition temperature of poly(S/DVB)HIPEs was increased from 1.79 to 5.41 MPa and 440.98 to 373.79 ℃, respectively. CO₂ adsorption tests were carried out on the obtained modified and unmodified poly (S/DVB)HIPE and it was found to be improved : this is due to the influence of ratio of S:DVB And amine solution investigated by GC-TGA technique. As the result, modified polyHIPE using S/DVB content; 0:100 with PEI on surface has the highest of CO₂ adsorption at 1.04 mmol/g.