A. Schmid, L. Kulin, P. Flodin
May 1, 1991
Citations
0
Influential Citations
18
Citations
Journal
Macromolecular Chemistry and Physics
Abstract
Trimethylolpropane trimethacrylate (TRIM) was suspension-polymerized with toluene as poreforming agent. The concentration of the monomer (TRIM) in the porogen was varied between 20 and 50 vol.-% of the organic phase. The poly(TRIM) particles had narrow particle-size distributions. The porosity of the dry gels was studied with scanning electron microscopy, nitrogen adsorption/desorption and mercury porosimetry. All gels had bimodal pore-size distributions. The size distribution of large pores (r > 50 A) of solvent free poly(TRIM) broadened when the amount of TRIM was decreased. The pore-size distributions of the swollen poly(TRIM) gel particles were calculated from size-exclusion chromatography (SEC) results. The separation range for poly(TRIM) particles of polystyrene standards varied with the monomer concentration. A relationship between the pore-size distribution of dry poly(TRIM) gels and those of swollen gels is proposed. Whether or not the structure of poly(TRIM) gels could be described as fractals is discussed.