Pore structural studies of monodisperse porous polymer particles

Polymer–silica composites and silicas produced by high-temperature degradation of organic component

“…Well defined primary particles which have an approximately spherical shape are connected to each other forming a continuous pore network. Our observations are in line with previous studies concerning the internal structure of polymer network synthesized by crosslinking polymerization [39,41,42]. The polymer-silica nanocomposites are obtained as a result of the hydrolysis and condensation of the introduced silica precursor at the acidic conditions.…”

Formation of the porous structure during the polymerization ofmeta-divinylbenzene andpara-divinylbenzene with toluene and 2-ethylhexanoic acid (2-EHA) as porogens

“…24 According to Cheng et al, 24 these two methods are best regarded as complementary, for each becomes uncertain as the pore size range approaches a limit-nitrogen adsorption at the upper end of the mesopore range, and mercury at the lower end. The very high pressure involved in the detection of small pores in mercury porosimetry may raise the potential problem of collapse of the polymer matrices.…”

“…Therefore, when samples are exposed to increasing pressure of mercury during the poresize distribution measurements, the polymer matrices are likely to be compressed. 24 In the present study, the pore-size distribution has been measured by nitrogen desorption (10 -2000 Å) and a mercury intrusion method (50 -5000 Å).…”

Characterization of crosslinked, macroporous, monosized polymer particles

“…28 According to Cheng et al, 28 these two methods are best regarded as complementary, for each becomes uncertain as the pore size range approaches a limit, nitrogen adsorption at the upper end of the mesopore range and mercury at the lower end. The very high pressure involved in the detection of small pores with mercury porosimetry may raise the potential problem of collapse of the polymer matrices.…”

“…Therefore, when samples are exposed to increasing pressure of mercury during the pore size measurements, the polymer matrices are likely to be compressed. 28 Due to this uncertainty, the pore size distribution (10 -2000 Å) of A1E and A2E is based on the nitrogen desorption isotherm (Table III). In the case of the macroporous particles prepared with 2-EHA, there is a good agreement between the mercury porosimetry and nitrogen desorption isotherm in the pore size range 50 -200 Å [ Fig.1(c,d)].…”