Zhang W, Fujiwara T, Taşkent H, Zheng Y, Brunson K, Gamble L, Wynne KJ. A Polyurethane Surface Modifier: Contrasting Amphiphilic and Contraphilic Surfaces Driven by
block and
random Soft Blocks having Trifluoroethoxymethyl and PEG Side Chains.
MACROMOL CHEM PHYS 2012;
213. [PMID:
24204100 DOI:
10.1002/macp.201200075]
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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, θrec can 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.
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