NDLI: Novel Biodegradable Adaptive Hydrogels: Controlled Synthesis and Full Characterization of the Amphiphilic Co-Networks

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Novel Biodegradable Adaptive Hydrogels: Controlled Synthesis and Full Characterization of the Amphiphilic Co-Networks

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Paneva, Dilyana Dubois, Philippe Mespouille, Laetitia Degée, Philippe Coulembier, Olivier Rashkov, Iliya
Description	Author Affiliation: Mespouille L ( Center of Innovation and Research in Materials and Polymers, Laboratory of Polymeric and Composite Materials, University of Mons-Hainaut 20, Place du Parc, Mons, Belgium.)
Abstract	Adaptive and amphiphilic poly(N,N-dimethylamino-2-ethyl methacrylate-graft-poly[ε-caprolactone]) co-networks (netP(DMAEMA-g-PCL)) were synthesized from a combination of controlled polymerization techniques. Firstly, PCL cross-linkers were produced by ring-opening polymerization (ROP) of ε-CL initiated by 1,4-butane-diol and catalyzed by tin(II) 2-ethylhexanoate $([Sn(Oct)_{2}]),$ followed by the quantitative esterification reaction of terminal hydroxyl end-groups with methacrylic anhydride. Then, PCL cross-linkers were copolymerized to DMAEMA monomers by atom-transfer radical polymerization (ATRP) in THF at 60 °C using CuBr complexed by 1,1,4,7,10,10-hexamethyltriethylenetetramine (HMTETA) and 2-ethyl isobutyrylbromide (EiBBr) as catalytic complex and initiator, respectively. A comprehensive study of gel formation was carried out by employing dynamic light scattering (DLS) to determine the gel point as a function of several parameters and to characterize the viscous solutions obtained before the gel point was reached. The evolution of the mean diameters was compared to a model previously developed by Fukuda and these attest to the living formation of the polymer co-network. Furthermore, we also demonstrated the reliability of ATRP for producing well-defined and homogeneous polymer co-networks by the smaller deviation from Flory's theory in terms of cross-linking density. For sake of clarity, the impact of polymerization techniques over the final structure and, therefore, properties was highlighted by comparing two samples of similar composition, but that were produced by either ATRP or thermal-initiated free-radical polymerization (FRP).
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	21
Volume Number	14
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2008-01-01
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Hydrogels Chemical Synthesis Metabolism Cross-Linking Reagents Chemistry Hydrogen-Ion Concentration Hydrolysis Magnetic Resonance Spectroscopy Molecular Weight Optics And Photonics Polymers Time Factors Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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