Article (Scientific journals)
Kinetic processes at the demixing transition of PNIPAM solutions
Philipp, Martine; Müller, Ulrich; Jiménez Riobóo et al.
2013In Soft Matter, 9, p. 887–9896
Peer Reviewed verified by ORBi
 

Files


Full Text
Pub_KineticProcesses_PNIPAM_SM_2013.pdf
Publisher postprint (525.49 kB)
Request a copy

All documents in ORBilu are protected by a user license.

Send to



Details



Abstract :
[en] Kinetic processes, which are joined with mass transport, are studied in the vicinity of the sharp LCST-type demixing transition of semi-dilute aqueous poly(N-isopropyl acrylamide) (PNIPAM) solutions. These processes are slow as compared to the highly cooperative collapse of individual polymer chains. Purely elastic properties, that are particularly sensitive to this phase transition, are addressed depending on the temperature, space and time by Brillouin spectroscopy. Above the demixing temperature Tc, we discriminate between kinetics related to the phase separation into PNIPAM-rich and PNIPAM-poor domains and kinetics connected to the impact of gravitation on the on-going phase separation. Using shallow temperature jumps of 0.3 C, the growth of compact PNIPAM-rich agglomerates with identical gel-like mechanical consistency is provoked independently of temperature and position within the sample above Tc. Astonishingly, the transition temperature does not vary while heating or cooling the solutions across the phase transition, although the elastic properties depend strongly on space and time during the equilibration of PNIPAM concentration gradients following the re-entrance into the lowtemperature phase.
Disciplines :
Physics
Author, co-author :
Philipp, Martine ;  Technische Universität München - TUM
Müller, Ulrich ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Jiménez Riobóo;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit ; Instituto de Ciencia de Materiales de Madrid, CSIC
Sanctuary, Roland ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Müller-Buschbaum, P.;  Technische Universität München - TUM
Krüger, Jan-Kristian ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Language :
English
Title :
Kinetic processes at the demixing transition of PNIPAM solutions
Publication date :
2013
Journal title :
Soft Matter
ISSN :
1744-6848
Publisher :
Royal Society of Chemistry, Cambridge, United Kingdom
Volume :
9
Pages :
887–9896
Peer reviewed :
Peer Reviewed verified by ORBi
Additional URL :
Available on ORBilu :
since 18 December 2013

Statistics


Number of views
72 (5 by Unilu)
Number of downloads
0 (0 by Unilu)

Scopus citations®
 
10
Scopus citations®
without self-citations
6
OpenCitations
 
10
WoS citations
 
10

Bibliography


Similar publications



Contact ORBilu