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Modeling of the Phase Separation Behavior of Polydisperse Semi-Flexible Diblock Copolymers

✍ Scribed by Andreas John; Peter Friedel; Doris Pospiech; Dieter Jehnichen; Christoph Kunert

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
186 KB
Volume
13
Category
Article
ISSN
1022-1344

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✦ Synopsis

Abstract

Summary: A modified random phase approximation method with a cumulant expansion for the semi‐flexible structure factor of diblock copolymers was exercised to describe the phase separation behavior of semi‐flexible and polydisperse diblock copolymers. Scattering curves and spinodal diagrams were calculated applying monomer specific input parameters. The influence of polydispersity was included applying basic concepts of mathematical statistics utilizing several probability density distributions in the case of the two single blocks. In contrast to semi‐flexibility, the main effect of polydispersity was found to shift the spinodal up, thus to enlarge the range of existence of the homogeneous phase.

Twofold Schultz‐Zimm distribution of diblock copolymers.

magnified imageTwofold Schultz‐Zimm distribution of diblock copolymers.

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