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      • pH-responsive aqueous/LC interfaces using SGLCP-<i>b</i>-polyacrylic acid block copolymers

        Lee, Dong-Yul,Seo, Jung-Min,Khan, Waliullah,Kornfield, Julia A,Kurji, Zuleikha,Park, Soo-Young Royal Society of Chemistry 2010 SOFT MATTER Vol.6 No.9

        <P>Block copolymers that combine a side-group liquid crystalline polymer (SGLCP) block and a pH-responsive hydrophilic block, poly(acrylic acid) (PAA), are shown to confer pH-dependent anchoring of the director orientation at the aqueous/LC interface. The SGLCP block, poly(4-cyanobiphenyl-4-oxyundecylacrylate), was chosen based on its ability to influence the director field of the 5CB (4-cyano-4′-pentylbiphenyl). At low pH the PAA block collapses and the inherent, planar alignment tendency of 5CB at a water interface prevails. As pH increases, the polyelectrolyte block becomes increasingly charged and expands, producing a change to homeotropic anchoring. The change in anchoring occurs as quickly as the buffer can be changed (within ∼2 s) and is reversible, with a response that is repeatable over as many cycles as were tested (approximately 20 cycles). The polymer-mediated anchoring persists for 6 days, indicating that the SGLCP block secures the self-assembled layer on the 5CB, even under conditions that cause repulsive interactions among the PAA blocks. Thus, SGLCP blocks can translate conformational changes of a responsive hydrophilic block into rapid, reversible changes in the director field.</P> <P>Graphic Abstract</P><P>A polyacrylic acid sensing domain changes from a collapsed conformation to an expanded one by variation of pH which changes the appearance from bright to dark when viewed between crossed polarizers. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b926461b'> </P>

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