Dynamic Dilution, Constraint-Release, and Star−Linear Blends

Dynamic Dilution, Constraint-Release, and Star−Linear Blends

The dynamic dilution theory of stress relaxation, quantitative for star polymer melts, cannot be directly applied to star−linear blends. The linear chains on their reptation time scale τd release constraints on the star arms, resulting in constraint-release Rouse motion for the star arms not describ...

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Veröffentlicht in:Macromolecules 1998-12, Vol.31 (26), p.9345-9353
Hauptverfasser: Milner, S. T, McLeish, T. C. B, Young, R. N, Hakiki, A, Johnson, J. M
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Rheology and viscoelasticity
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Zusammenfassung:The dynamic dilution theory of stress relaxation, quantitative for star polymer melts, cannot be directly applied to star−linear blends. The linear chains on their reptation time scale τd release constraints on the star arms, resulting in constraint-release Rouse motion for the star arms not described by dynamic dilution. We present a microscopic theory without adjustable parameters for stress relaxation in such blends, which is in excellent agreement with dynamic rheology data for the full range of blend fractions.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma980481v