Copolymer films (100 pm thick) were prepared by cast polymerization of methacryloyl-L-alanine methyl ester (MA-L-AIaOMe) 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
Посилання на статтю:
Thermo-response of ion track pores in copolymer films of methacryloyl- L-alanine methyl ester and diethyleneglycolbis- allylcarbonate / Masao Tamada*, Masaru Yoshida, Masaharu Asano and Hideki Omichi // Polymer. – 1992. – Vol 33. – P. 3169-3172.