Journal
CARBOHYDRATE POLYMERS
Volume 92, Issue 2, Pages 1054-1063Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.10.017
Keywords
Hyaluronic acid; Atom transfer radical polymerization; Poly(ethylene glycol) methacrylate; Butyl methacrylate; N-Isopropylacrylamide
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Funding
- Italian Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR)
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In this work, an efficient method tor the synthesis of hyaluronic acid based brush copolymers using atom transfer radical polymerization (ATRP) has been reported. At first, two different hyaluronic acid (HA) based macroinitiators have been prepared and then they have been used for the polymerization via ATRP of hydrophilic or hydrophobic molecules carrying vinyl portions. In particular, by linking 2-bromo-2-methylpropionic acid (BMP) to the primary hydroxyl groups of tetrabutyl ammonium salt of HA (HA-TBA) or to amino groups of the ethylenediamino derivative of HA-TBA (HA-TBA-EDA), two macroinitiators (HA-TBA-BMP and HA-TBA-EDA-BMP) have been obtained. Then they have been used for the ATRP of poly(ethylene glycol) methacrylate (PEGMA), butyl methacrylate (BUTMA) or N-isopropylacrylamide (NIPAM) using a complex of Cu(I) and 2,2'-Bipyridyl (Bpy), as a catalyst. Both macroinitiators and final copolymers, named as HA-BMP-pPEGMA, HA-BMP-pBUTMA, HA-BMP-pNIPAM, HA-EDA-BMP-pPEGMA, HA-EDA-BMP-pBUTMA and HA-EDA-BMP-pNIPAM, have been characterized by spectroscopic analysis and size exclusion chromatography to confirm the success of the polymerization process. (C) 2012 Elsevier Ltd. All rights reserved.
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