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Studies on Micellization Behavior of Thermosensitive PNIPAAm-b-PLA Amphiphilic Block Copolymers

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Thermo-sensitive amphiphilic block copolymers, poly(N-isopropylacrylamide)-block- poly(D,L-lactide) (PNIPAAm-b-PLA), were synthesized through a simple free radical copolymerization route based on a bifunctional initiator, 2,2′-azobis(2-methylpropion amidine) dihydrochloride (AMAD), followed by the ring-opening polymerization of D,L-lactide in the presence of Sn(Oct)2 catalyst. The Chemical structure characterization were conducted by means of 1H NMR, FT-IR, GPC. The amphiphilic PNIPAAm-b-PLA block copolymers could self-assemble into micelles with regularly spherical shape in an aqueous solution, with a TEM diameter range of 46–56 nm, DLS hydro-dynamic diameter of 158–199 nm. This behavior depends on the environmental temperature, the hydrophobic interactions among PNIPAAm molecular chains, intermolecular hydrogen bonding between the PNIPAAm chains and water molecules as well as intramolecular hydrogen bonding between −CONH2 groups.The copolymers held a CMC from 5.50 to 6.17 mg L−1 and LCST from 31.41–32.03 °C, being more or less affected by their compositions, PLA or PNIPAAm block length. The as-prepared PNIPAAm-b-PLA block polymers are anticipated to be applied as a potential candidate of drug release carriers.
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Document Type: Research Article

Publication date: March 1, 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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