How good is the bead-spring model?

S. Amelar, C. E. Eastman, T. P. Lodge, E. D. von Meerwall

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The predictions of the bead-spring model are compared with the infinite dilution dynamic properties of polystyrene in Aroclor 1248, as a function of molecular weight. The experimentally determined quantities include the longest relaxation time and the relaxation-time spectrum, obtained via oscillatory flow birefringence; the diffusion coefficient, measured by NMR and forced Rayleigh scattering; the radius of gyration, determined by small-angle neutron scattering; and the intrinsic viscosity. In all cases, the data are very well described by the model, using a consistent set of three parameters. However, the conformational dynamics experiments suggest a surprisingly sharp end to the relaxation spectrum, corresponding to the relaxation time for an approximately 50-monomer subchain.

Original languageEnglish (US)
Pages (from-to)551-555
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume131-133
Issue numberPART 2
DOIs
StatePublished - Jun 2 1991

Bibliographical note

Funding Information:
This work was supported by the National Science Foundation (DMR-8319291 and DMR-8715391) and the University of Minnesota/NSF Center for Interfacial Engineering. The authors are also indebted to J.L. Schrag and his research group for many helpful discussions, and their willingness to make their results available.

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