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Modeling of the Phase Separation Behavior of Polydisperse Semi‐Flexible Diblock Copolymers
Author(s) -
John Andreas,
Friedel Peter,
Pospiech Doris,
Jehnichen Dieter,
Kunert Christoph
Publication year - 2004
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/mats.200400022
Subject(s) - spinodal , dispersity , copolymer , spinodal decomposition , materials science , structure factor , statistical physics , phase (matter) , random phase approximation , thermodynamics , polymer , physics , polymer chemistry , condensed matter physics , quantum mechanics , composite material
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.