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| Azevedo, Nuno Monteiro |
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Galantini, Luciano
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Publications (5/5 displayed)
- 2021Biosynthesis and physico-chemical characterization of high performing peptide hydrogels@graphene oxide compositescitations
- 2017Mixed micelles of oppositely charged poly( N -isopropylacrylamide) diblock copolymerscitations
- 2017Mixed micelles of oppositely charged poly(N-isopropylacrylamide) diblock copolymerscitations
- 2017Time-Dependent pH Scanning of the Acid-Induced Unfolding of Human Serum Albumin Reveals Stabilization of the Native Form by Palmitic Acid Bindingcitations
- 2012Nanoparticles with a Bicontinuous Cubic Internal Structure Formed by Cationic and Non-ionic Surfactants and an Anionic Polyelectrolyte.citations
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article
Mixed micelles of oppositely charged poly(N-isopropylacrylamide) diblock copolymers
Abstract
Mixed micelle formation between two oppositely charged diblock copolymers that have a common thermosensitive nonionic block of poly(N-isopropylacrylamide) (PNIPAAM) has been studied. The block copolymer mixed solutions were investigated under equimolar charge conditions as a function of both temperature and total polymer concentrations by turbidimetry, differential scanning calorimetry, two-dimensional proton nuclear magnetic nuclear Overhauser effect spectroscopy (2D 1H NMR NOESY), dynamic light scattering, and small angle X-ray scattering measurements. Well-defined and electroneutral cylindrical micelles were formed with a radius and a length of about 3 nm and 35 nm, respectively. In the micelles, the charged blocks built up a core, which was surrounded by a corona of PNIPAAM chains. The 2D 1H NMR NOESY experiments showed that a minor block mixing occurred between the core blocks and the PNIPAAM blocks. By approaching the lower critical solution temperature of PNIPAAM, the PNIPAAM chains collapsed, which induced aggregation of the micelles. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017