Porosity determination of poly(trimethylolpropane trimethacrylate) gels

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 th...

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Bibliographic Details
Published in:Die Makromolekulare Chemie 1991-05, Vol.192 (5), p.1223-1234
Main Authors: Schmid, Andrea, Kulin, Lars-Inge, Flodin, Per
Format: Article
Language:English
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Summary: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 Å) 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.
ISSN:0025-116X
0025-116X
DOI:10.1002/macp.1991.021920521