A polyurethane surface modifier: Contrasting amphiphilic and contraphilic surfaces driven by block and random soft blocks having trifluoroethoxymethyl and PEG side chains
Abstract
A conventional MDI-BD-PTMO polyurethane is modified using 2 wt% polyurethanes (U) having copolyoxetane soft blocks with hydrophobic 3F, CF 3CH 2OCH 2- and hydrophilic MEn, CH 3O(CH 2CH 2O) nCH 2-, n = 3, 7) side chains. In contrast to neat 3F-co-MEn-U, 2 wt% 3F-co-MEn-U compositions have physically stable morphologies and wetting behavior. Surface composition (XPS) and amphiphilic or contraphilic wetting are controlled by the 3F-co-MEn polyoxetane soft block architecture and MEn side chain length. Importantly, θ rec can be tuned for 2 wt% 3F-co-MEn-U compositions independent of swelling, which is controlled by the bulk polyurethane. AFM imaging leads to a new morphological model whereby fluorous/PEG-hard block nanoaggregates combine to form near surface features culminating in micron-scale texturing. Modification of a conventional MDI-BD-PTMO polyurethane is effected by 2 wt% polyurethanes (U) having copolyoxetane soft blocks with hydrophobic 3F, CF 3CH 2OCH 2- and hydrophilic MEn, CH 3O(CH 2CH 2O) nCH 2-, n = 3, 7) side chains. Amphiphilic or contraphilic wetting resulted. AFM imaging led to a new morphological model for modified surfaces whereby fluorous/PEG-hard block nano-aggregates (illustrated) combine to form near surface features. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Publication Title
Macromolecular Chemistry and Physics
Recommended Citation
Zhang, W., Fujiwara, T., Taşkent, H., Zheng, Y., Brunson, K., Gamble, L., & Wynne, K. (2012). A polyurethane surface modifier: Contrasting amphiphilic and contraphilic surfaces driven by block and random soft blocks having trifluoroethoxymethyl and PEG side chains. Macromolecular Chemistry and Physics, 213 (14), 1415-1434. https://doi.org/10.1002/macp.201200075
