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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 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, ?rec 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.

SUBMITTER: Zhang W 

PROVIDER: S-EPMC3817836 | biostudies-literature | 2012 Jul

REPOSITORIES: biostudies-literature

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A Polyurethane Surface Modifier: Contrasting Amphiphilic and Contraphilic Surfaces Driven by <i>block</i> and <i>random</i> Soft Blocks having Trifluoroethoxymethyl and PEG Side Chains.

Zhang Wei W   Fujiwara Tomoko T   Taşkent Hűmeyra H   Zheng Ying Y   Brunson Kennard K   Gamble Lara L   Wynne Kenneth J KJ  

Macromolecular chemistry and physics 20120701 14


A conventional MDI-BD-PTMO polyurethane was modified using 2 wt.% polyurethanes (U) having copolyoxetane soft blocks with hydrophobic 3F, CF<sub>3</sub>CH<sub>2</sub>OCH<sub>2</sub>- and hydrophilic MEn, CH<sub>3</sub>O(CH<sub>2</sub>CH<sub>2</sub>O)<sub>n</sub>CH<sub>2</sub>-, n = 3, 7) side chains. In contrast to neat 3F-<i>co</i>-MEn-U, 2 wt.% 3F-<i>co</i>-MEn-U compositions have physically stable morphologies and wetting behavior. Surface composition (XPS) and amphiphilic or contraphilic wet  ...[more]

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