caa a22 4500 475763750 CHVBK 20180406123559.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/s003960000329 doi (NATIONALLICENCE)springer-10.1007/s003960000329 Influence of cross-link density on rheological properties of temperature-sensitive microgel suspensions [Elektronische Daten] [H. Senff, W. Richtering] The influence of the cross-link density on rheological properties of thermosensitive microgels was investigated. The temperature-sensitive hydrogel particles consisted of poly (N-isopropylacrylamide) (PNiPAM) chemically cross-linked with several different molar ratios of N,N′-methylenebisacrylamide. The variation of cross-link density leads to soft spheres that possess a different particle interaction potential and a different swelling ratio. With increasing temperature the microgel particles decrease in size and with it the effective volume fraction, which leads to strong changes in rheological properties. The relative zero-shear viscosity and the plateau modulus at different temperatures superpose to mastercurves when plotted versus the effective volume fraction. Up to an effective volume fraction of 0.5 the microgels behaved like hard spheres and the maximum volume fraction, as determined from the divergence of the zero-shear viscosity, was mainly dominated by the polydispersity of the spheres and not by the cross-link density. The plateau modulus, on the other hand, revealed soft-sphere behavior and the interaction potential became softer with decreasing cross-linker content. Springer-Verlag Berlin Heidelberg, 2000 Key words Temperature-sensitive microgel nationallicence Poly(N-isopropylacrylamide) nationallicence Rheology nationallicence Hard spheres nationallicence Colloidal suspension nationallicence Senff H. Institut für Makromolekulare Chemie Albert-Ludwigs-Universität Freiburg Stefan-Meier-Strasse 31 79104 Freiburg, Germany e-mail: rich@uni-freiburg.de Tel.: +49-761-2036304 Fax: +49-761-2036319, DE aut Richtering W. Institut für Makromolekulare Chemie Albert-Ludwigs-Universität Freiburg Stefan-Meier-Strasse 31 79104 Freiburg, Germany e-mail: rich@uni-freiburg.de Tel.: +49-761-2036304 Fax: +49-761-2036319, DE aut https://doi.org/10.1007/s003960000329 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000329 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Senff H. Institut für Makromolekulare Chemie Albert-Ludwigs-Universität Freiburg Stefan-Meier-Strasse 31 79104 Freiburg, Germany e-mail: rich@uni-freiburg.de Tel.: +49-761-2036304 Fax: +49-761-2036319, DE aut NATIONALLICENCE 700 1- Richtering W. Institut für Makromolekulare Chemie Albert-Ludwigs-Universität Freiburg Stefan-Meier-Strasse 31 79104 Freiburg, Germany e-mail: rich@uni-freiburg.de Tel.: +49-761-2036304 Fax: +49-761-2036319, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer