Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 210, Issue 20, Pages 1726-1733Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.200900253
Keywords
fluorescence; light scattering; nanoparticles; TEM; thermo-responsive polymers; triblock copolymers
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Funding
- CNPq
- CAPES-Brazil [CAPES/COFECUB-348/1, 620/08]
- Federal University of Santa Catarina (UFSC)
- EPSRC
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Aqueous self-assembly of thermosensitive triblock copolymers based on poly(N-isopropylacrylamide) and poly[2-(methacryloyloxy) ethyl phosphorylcholine] (PNIPAM(m)-PMPCn-PNIPAM(m) and PNIPAM(m)-PMPCn-S-S-PMPCn-PNIPAM(m)) were studied using light scattering (SLS and DLS), TEM and fluorescence experiments. These techniques were used to investigate the morphological transition as a function of the temperature, below and above the LCST of the PNIPAM, at various triblock copolymer concentrations ranging from dilute to semi-dilute regimes. Below the LCST and at low concentrations, aqueous solutions show micellar behavior, while above the LCST self-assembly leading to large nanoparticles stabilized with PMPC chains. Such behavior is the onset of a gel-like phase transition observed at higher concentrations.
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