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beta-Lactam Functionalized Poly(isoprene-b-ethylene oxide) Amphiphilic Block Copolymers

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beta-Lactam Functionalized Poly(isoprene-b-ethylene oxide) Amphiphilic Block Copolymers
Kaditi, Elen
Πίσπας, Στέργιος
Άρθρο σε επιστημονικό περιοδικό
2010-01-01
HOBOKEN
Amphiphilic block copolymers containing beta-lactam groups on the polyisoprene block were synthesized from poly (isoprene-b-ethylene oxide) (IEO) diblock copolymer precursors, prepared by anionic polymerization. beta-Lactam functionalization was achieved via reaction of the polyisoprene (PI) block with chlorosulfonyl isocyanate and subsequent reduction. The resulting block copolymers were molecularly characterized by SEC, FTIR, and NMR spectroscopies and DSC. Functionalization was found to proceed in high yields, altering the solubility properties of the PI block and those of the functionalized diblocks. Hydrogen bond formation is assumed to be responsible for the decreased crystallinity of the poly(ethylene oxide) block (PEO) in the bulk state as indicated by DSC measurements. The self-assembly behavior of the beta-lactam functionalized poly(isoprene-b-ethylene oxide) copolymers (LIEO) in aqueous solutions was studied by dynamic light scattering (DLS), static light scattering (SLS), fluorescence spectroscopy, and atomic force microscopy (AFM). Nearly spherical loose aggregates were formed by the LIEO block copolymers, having lower aggregation numbers and higher cmc values compared to the IEO precursors, as a result of the increased polarity of the beta-lactam rings incorporated in the PI blocks.
functionalization of polymers
light scattering
micelles
Polymer Science
amphiphilic block copolymers
anionic polymerization
English
John Wiley & Sons, Inc.
Journal of Polymer Science Part A-polymer Chemistry
https://rightsstatements.org/page/InC/1.0/?language=en
© 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48:24-33, 2010
© 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48:24-33, 2010 (EN)
National Hellenic Research Foundation (NHRF)
Helios - Repository of the National Hellenic Research Foundation (NHRF)



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