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    pH Responsive Highly Branched Poly(N-isopropylacrylamide) with Trihistidine or Acid Chain Ends

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    Publication date
    2016
    Author
    Swift, Thomas
    Lapworth, J.
    Swindells, K.
    Swanson, L.
    Rimmer, Stephen
    Keyword
    Polymers; Trihistidine; Carboxylate chain ends; Acid chain ends; Thermal responsiveness
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    Thermally responsive highly branched poly(N-isopropyl acrylamide)s (HB-PNIPAM) were prepared and end-functionalised to give polymers with acid or trihistidine end groups. These polymers exhibit a broad coil-to-globule transition across a wide temperature range which can be measured using covalently attached fluorescent tags. The acid chain ends provided a material with a distinct change in solution behaviour at pH close to the pKa of the carboxylate group. At pH 11 this polymer did not show a cloud point up to 50 °C but fluorescence measurements on the labelled polymers showed that a coil to glubule transition did take place. The globular state, above the LCST, appeared to be more swollen if the end group carried charge then when it was uncharged. A polymer with trihistidine and free carboxylate chain ends, which contained multiple charges at various pH, did show LCSTs at all pH and the polymer globule was shown to be swollen at each pH.
    URI
    http://hdl.handle.net/10454/11041
    Version
    Accepted Manuscript
    Citation
    Swift T, Lapworth J, Swindells K et al (2016) pH responsive highly branched poly(N-isopropylacrylamide) with trihistidine or acid chain ends. RSC Advances. 75: 71345-71350.
    Link to publisher’s version
    http://dx.doi.org/10.1039/C6RA13139E
    Type
    Article
    Collections
    Life Sciences Publications

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