Crosslinked Poly(2-Hydroxyethyl Methacrylate) by Emulsion Templating: Influence of Crosslinker on Microcellular Structure

摘要

The synthesis of microcellular porous polymers based on 2-hydroxyethyl methacrylate (HEMA) by free radical polymerisation of a continuous phase of high internal phase emulsion (HIPE) is reported. N,N'-methylene bis-acrylamide (MBAA) and glutaraldehyde are used as cross-linking agents. GA is added to the monomer phase either during the emulsion preparation or post polymerisation crosslinking of HEMA is performed. The crosslinker influences the morphological structure of porous poly(HEMA) materials. In the case of using MBAA as the crosslinker, homogeneous polyHIPE structure is obtained, with average cavities diameter approximately 8 μm and interconnecting pore diameter approximately 3 μm. In the case of using GA in situ crosslinking a polyHIPE is obtained exhibiting cavities of diameter approximately 12 urn and interconnecting pores of approximately 3 xm. Post polymerisation cross-linking with GA influence the structural features resulting in a different morphology. Samples are characterised using FTIR spectroscopy, scanning electron microscopy, nitrogen adsorption and swelling behaviour measurements. Polymers are prepared in the form of monoliths and membranes.