Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2002-05-24
Phys. Rev. E 66, 020803 (R) (2002)
Physics
Condensed Matter
Soft Condensed Matter
4 pages in RevTeX with 4 figures
Scientific paper
10.1103/PhysRevE.66.020803
We have performed accurate dynamic light-scattering measurements near critical demixing points of solutions of polystyrene in cyclohexane with polymer molecular weight ranging from 200,000 to 11.4 million. Two dynamic modes have been observed, ''slow'' and ''fast'', that result from a coupling between diffusive relaxation of critical fluctuations of the concentration and visco-elastic relaxation associated with the entanglement network of the polymer chains. The coupling with the visco-elastic mode causes an additional slowdown of the critical mode on top of the uncoupled diffusion mode. By implementing crossover from critical to theta-point tricritical behavior for both static and dynamic properties, we are able to present a quantitative description of the phenomenon and to obtain a scaling of the visco-elastic parameters as a function of the molecular weight.
Anisimov Mikhail A.
Kostko A. F.
Sengers Jan V.
No associations
LandOfFree
Dynamic Crossover to Tricriticality and Anomalous Slowdown of Critical Fluctuations by Entanglements in Polymer Solutions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dynamic Crossover to Tricriticality and Anomalous Slowdown of Critical Fluctuations by Entanglements in Polymer Solutions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic Crossover to Tricriticality and Anomalous Slowdown of Critical Fluctuations by Entanglements in Polymer Solutions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-420566