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The influence of elongational flow on association rate and phase behaviour of binary polymer blends
Author(s) -
Dormidontova Elena,
ten Brinke Gerrit
Publication year - 2000
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200001)149:1<23::aid-masy23>3.0.co;2-9
Subject(s) - polymer , copolymer , materials science , phase (matter) , polymer blend , polymer chemistry , flow (mathematics) , dumbbell , thermodynamics , binary number , chain (unit) , chemistry , composite material , mechanics , organic chemistry , physics , medicine , arithmetic , mathematics , astronomy , physical therapy
Abstract Flow‐induced phase separation in binary blends of end‐associating polymers is studied analytically. To describe the conformational and orientational properties of a polymer chain a simple dumbbell model is applied. It is demonstrated that the association rate for formation of associated diblock copolymer‐like chains decreases with an increase of flow rate. This is due to the extra‐stretching of the associated chain compared with the two initial homopolymer chains. The decrease in the fraction of associated diblock copolymer‐like chains makes the homogeneous state less stable, so the effect of flow manifests itself in the enhancement of the segregation tendency in these kind of associated polymer blends.