ABC triblock terpolymers containing polylactide, poly(dimethylacrylamide) and polystyrene, which can self-assemble as aligned cylinders, are etched to give nanoscopic pores. The diffusion of gases through these pores is quantitatively consistent with Knudsen diffusion. The flow of water liquid in the pores is consistent with the Hagen-Poiseuille law. If these polymers can be produced as commercial ultrafiltration membranes, they should give a larger hydraulic permeability and a sharper molecular weight cut-off.
Bibliographical noteFunding Information:
The authors benefited from suggestions of J.P. DeRocher and G.D. Moggridge of Cambridge University. This work was largely supported by the Air Force Office of Scientific Research (grant F49620-01-1-0333). Other support came from the Department of Energy (grant DE-FG-02ER63509), the Petroleum Research Fund (grant 39083-AC9), and the Initiative for Renewable Energy and the Environment at the University of Minnesota.
- Block copolymers
- Gas diffusion