Hydrophilic and stimuli responsive nanoporous poly(dicyclopentadiene) membranes are prepared using reactive ABC triblock polymers consisting of a chemically etchable 'A' block, poly(lactide), various functionalized 'B' blocks, and a metathesis-reactive 'C' block, poly(styrene-stat-norbornenylethylstyrene) .A membrane with a bicontinuous structure is formed by reaction-induced phase separation during the metathesis crosslinking of dicyclopentadiene in the presence of the ABC triblock polymers. Selective etching of the poly(lactide) block exposed the functionality contained in the B block. Hydrophilic membranes are prepared from a triblock polymer with a poly(N,N-dimethylacrylamide) B midblock as evidenced by static contact angle measurements in comparison to AC diblock templated membranes. Temperature responsive membranes are prepared from a triblock polymer with a poly(N-isopropylacrylamide) B block.
Bibliographical noteFunding Information:
This work was supported in part by the MRSEC Program of the National Science Foundation under Award Number DMR-0212302 and the National Science foundation (DMR-1006370). M.A.A. acknowledges financial support from the USA Air Force. Parts of this work were carried out in the College of Science and Engineering Characterization Facility, University of Minnesota, a member of the NSF-funded Materials Research Facilities Network (www.mrfn.org). We thank Liang Chen for O2-RIE, Dr Megan Robertson for help with image analysis and reading the manuscript, and Dr W. Syszynski for contact angle measurements.