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Temperature dependent phase behavior of PNIPAM microgels in mixed water/methanol solvents

Journal of polymer science. Part B, Polymer physics, 2013-07, Vol.51 (14), p.1100-1111 [Peer Reviewed Journal]

Copyright © 2012 Wiley Periodicals, Inc. ;ISSN: 0887-6266 ;EISSN: 1099-0488 ;DOI: 10.1002/polb.23194 ;CODEN: JPBPEM

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  • Title:
    Temperature dependent phase behavior of PNIPAM microgels in mixed water/methanol solvents
  • Author: Kojima, Hiroyuki ; Tanaka, Fumihiko ; Scherzinger, Christine ; Richtering, Walter
  • Subjects: competitive hydrogen bonds ; cononsolvency ; dynamic light scattering ; Hydration ; Light scattering ; Methyl alcohol ; Microgels ; neutron scattering ; poly(N-isopropylacylamide) ; Reproduction ; solvent excess adsorption ; solvent excess binding ; Solvents ; Styrene acrylonitrile resins ; Transition temperature
  • Is Part Of: Journal of polymer science. Part B, Polymer physics, 2013-07, Vol.51 (14), p.1100-1111
  • Description: Temperature dependent phase behavior of poly(N‐isopropylacylamide) (PNIPAM) microgels in water/methanol mixtures of different composition was studied with dynamic light scattering (DLS) and small‐angle neutron scattering (SANS). Using DLS, it is possible to measure the diffusion coefficient, and thus the size of particles exactly and directly; the variation of the phase transition temperature in the different solvents is also easy to detect by this method. With SANS measurements in D2O/MeOD mixtures, some of the DLS results were confirmed. Moreover, SANS measurements give valuable information on the particle structure in different solvents. The experiments were compared with the theory of competitive hydration introduced by Tanaka et al. We found a good agreement of theory and experiment, and obtained the theoretical predictions: around the transition temperature, the composition of the bound methanol along the chains is higher than that of the outer solution, while the whole methanol composition inside the gel is lower. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym. Phys. 2013, 51, 1100–1111 The molecular mechanism of cononsolvency has been studied for linear polymers and macrogels, but there have been only a few studies on microgels. Temperature dependent swelling behavior of poly(N‐isopropylacylamide) (PNIPAM) microgels in water/methanol mixtures was studied with DLS and SANS, and the data were theoretically analyzed under the assumption of competitive hydrogen bonds. Around the transition temperature, the methanol composition in the vicinity of the polymer chains is slightly higher than that of the outer solution while the whole methanol composition inside the gel is slightly lower.
  • Publisher: Hoboken: Blackwell Publishing Ltd
  • Language: English
  • Identifier: ISSN: 0887-6266
    EISSN: 1099-0488
    DOI: 10.1002/polb.23194
    CODEN: JPBPEM
  • Source: Alma/SFX Local Collection
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