Ion Track Technology

PhysicsConsult

Reimar Spohr

PostHeaderIcon Abstract

Thermo-response of ion track pores in copolymer films of methacryloyl-L-alaninemethylester and diethyleneglycol-bis-allylcarbonate (CR-39); M. Tamada, M. Yoshida, M. Asano, H. Omichi, R. Katakai, R. Spohr, and J. Vetter; Polymer 33(15)(1992)3169-3172

Copolymer films (100 μm thick) were prepared by cast polymerization of methacryloyl-l-alanine methyl ester (MA-l-AlaOMe) and diethyleneglycol-bis-allylcarbonate (CR-39). The films swell in water at temperatures below 60°C. The degree of swelling increases with decreasing temperature down to 0°C. The swelling capacity of the films increases with increasing MA-l-AlaOMe content. The thermal response is reversible. Swelling and shrinkage have different time constants of 24 h for swelling and 10 min for shrinkage. The films were subject to an ion track etching process consisting of a heavy ion irradiation using gold ions of 11.4 MeV per nucleon specific energy followed by subsequent etching of the latent ion tracks in NaOH solution. The resulting porous membranes show a reversible change of the pore diameters of 12% between 0°C and 60°C for a copolymer with 70 vol% MA-l-AlaOMe