Add time:08/29/2019         Source:sciencedirect.com

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.

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