Abstract
AbstractIn this paper we studied the influence of the copolymerization of trimethylolpropane trimethacrylate (TRIM) with methyl methacrylate (MMA) on the pore structure of the resulting gels. TRIM and MMA were suspension‐copolymerized with toluene as pore‐forming agent. All gels have bimodal pore‐size distributions. The size distribution of large pores (r > 50 Å) of the solvent‐free poly(TRIM‐co‐MMA) broadens when the TRIM/MMA ratio decreases. The size distribution of small pores (r < 50 Å) shows sharp maxima for pores with a radius of 20 Å. In the swollen state the separation range for the poly(TRIM‐co‐MMA) particles of polystyrene standards varies with the TRIM/MMA ratio. The results of the porosity measurements of the swollen gels show good agreement with the results obtained from the dry gels. The porosity of the dry gels was studied with scanning electron microscopy, nitrogen adsorption/desroption and mercury porosimetry. The pore‐size distributions of the swollen poly(TRIM‐co‐MMA) gel particles were calculated from the size‐exclusion chromatography (SEC) results.
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