Ion Track Technology

PhysicsConsult

Reimar Spohr

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P-Nitrophenol permeability and temperature characteristics of an acryloyl-L-proline methyl ester-based porous gel membrane. Hiroki, Akihiro; Yoshida, Masaru; Yamashita, Junko; Asano, Masaharu; Reber, Nicole; Spohr, Reimar; Kumakura, Minoru; Katakai, Ryoichi. J. Polym. Sci., Part A: Polym. Chem. (1998), 36(10), 1495-1500

Thermoresponsive porous gel membranes were synthesized by a simultaneously occurring process consisting of radiation-induced polymn. and crosslinking in aq. solns. at various concns. of acryloyl-L-proline Me ester (A-ProOMe) without a crosslinker. Permeation of p-nitrophenol (PNP) through a thermoresponsive porous gel membrane obtained at a monomer concn. of 80% (wt./wt.) drastically reduced around 14°, the lower crit. soln. temp. of linear poly(A-ProOMe) in water, from 0.60 x 10-3 cm/min at 10°C to no permeation at 18°, accompanied by changes in both size and shape of pores assocd. with gel shrinkage. Moreover, it was found that porous gel membranes with a porosity of approx. 60% had a greater PNP permeability const. through porous gel membranes with mutually connected pores obtained at a monomer concn. of 50% (wt./wt.) than individually