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2013 | OriginalPaper | Chapter

Poly-NIPAM Microgels with Different Cross-Linker Densities

Scaling Behavior of the Network Fluctuations in the Vicinity of the Volume Phase Transition

Authors : Matthias Karg, Sylvain Prévost, Astrid Brandt, Dirk Wallacher, Regine von Klitzing, Thomas Hellweg

Published in: Intelligent Hydrogels

Publisher: Springer International Publishing

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Abstract

Thermoresponsive microgel particles made of the monomer N-isopropylacrylamide (NIPAM) and the cross-linker molecule N,N’-methylenebisacrylamide (BIS) were synthesized using three different cross-linker molar ratios. The volume phase transition behavior of these colloids was investigated by means of dynamic light scattering (DLS) and small angle neutron scattering (SANS) covering the different length scales of interest. Both methods provide the temperature of the volume phase transition in good agreement. The volume change as followed by DLS is described using the Flory-Rehner theory, leading to the determination of the spinodal temperature. Furthermore, the network correlation length ξ, which is available from appropriate fits of the measured SANS profiles, was used to study the critical behavior in terms of scaling laws. The results from DLS and SANS show a strong cross-linker density dependence.

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Title: Poly-NIPAM Microgels with Different Cross-Linker Densities
Authors: Matthias Karg
Sylvain Prévost
Astrid Brandt
Dirk Wallacher
Regine von Klitzing
Thomas Hellweg
Publisher: Springer International Publishing
Book: Intelligent Hydrogels
Print ISBN: 978-3-319-01682-5

Electronic ISBN: 978-3-319-01683-2

Copyright Year: 2013
DOI: https://doi.org/10.1007/978-3-319-01683-2_6

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