Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-02-04
Macromolecules 42, 9537 (2009)
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
10.1021/ma901404g
We present a comprehensive investigation of polymer diffusion in the semidilute regime by fluorescence correlation spectroscopy (FCS) and dynamic light scattering (DLS). Using single-labeled polystyrene chains, FCS leads to the self-diffusion coefficient while DLS gives the cooperative diffusion coefficient for exactly the same molecular weights and concentrations. Using FCS we observe a new fast mode in the semidilute entangled concentration regime beyond the slower mode which is due to self-diffusion. Comparison of FCS data with data obtained by DLS on the same polymers shows that the second mode observed in FCS is identical to the cooperative diffusion coefficient measured with DLS. An in-depth analysis and a comparison with current theoretical models demonstrates that the new cooperative mode observed in FCS is due to the effective long-range interaction of the chains through the transient entanglement network.
Ballauff Matthias
Enderlein Joerg
Harnau Ludger
Hoffmann Sebastian T.
Koberling Felix
No associations
LandOfFree
Self-diffusion and Cooperative Diffusion in Semidilute Polymer Solutions as measured by Fluorescence Correlation Spectroscopy 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 Self-diffusion and Cooperative Diffusion in Semidilute Polymer Solutions as measured by Fluorescence Correlation Spectroscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-diffusion and Cooperative Diffusion in Semidilute Polymer Solutions as measured by Fluorescence Correlation Spectroscopy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-154658