title: A Polyurethane Surface Modifier: Contrasting Amphiphilic and Contraphilic Surfaces Driven byblockandrandomSoft Blocks having Trifluoroethoxymethyl and PEG Side Chains.
abstract: A conventional MDI-BD-PTMO polyurethane was modified using 2 wt.% polyurethanes (U) having copolyoxetane soft blocks with hydrophobic 3F, CF3CH2OCH2- and hydrophilic MEn, CH3O(CH2CH2O)nCH2-, 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, θreccan be tuned for 2 wt.% 3F-co-MEn-U compositions independent of swelling, which is controlled by the bulk polyurethane. AFM imaging led to a new morphological model whereby fluorous/PEG-hard block nano-aggregates combine to form near surface features culminating in micron scale texturing.
authors.affiliation: Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA 23284.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Tomoko
authors.initials: T
authors.lastname: Fujiwara
authors.forename: Hűmeyra
authors.initials: H
authors.lastname: Taşkent
authors.forename: Ying
authors.initials: Y
authors.lastname: Zheng
authors.forename: Kennard
authors.initials: K
authors.lastname: Brunson
authors.forename: Lara
authors.initials: L
authors.lastname: Gamble
authors.forename: Kenneth J
authors.initials: KJ
authors.lastname: Wynne
keywords: amphiphilic wetting; contraphilic wetting; copolyoxetanes; polyurethanes; surface modification