Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 55, Issue 19, Pages 1457-1469Publisher
WILEY
DOI: 10.1002/polb.24403
Keywords
diblock copolymers; oppositely charged; poly(N-isopropylacrylamide); micelles; self-organization
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Funding
- Swedish Research Council (VR) [621-2013-4339]
- Linnaeus grant Organizing Molecular Matter through VR [239-2009-6749]
- European Union through the NanoS3 project [290251]
- Norwegian Financial Mechanism [MSMT-28477/2014, 7F14009]
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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 H-1 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 H-1 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. (c) 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1457-1469
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