Microphase separation in polydisperse miktoarm star copolymers

A two or more chemically different homopolymers attached to a single junction point form a macromolecule of miktoarm star copolymer. The model of such copolymer composed of an arbitrary number of types of homopolymer arms is considered. The lengths distributions of arms are assumed to be arbitrary,...

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Bibliographic Details
Published in:Physica A 2011-10, Vol.390 (20), p.3245-3261
Main Authors: Aliev, M.A., Kuzminyh, N.Yu
Format: Article
Language:English
Subjects:
Algorithms
Copolymers
Free energy
Macromolecules
Melts
Microphase separation
Phase diagrams
Phase transitions
Segregations
Stars
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Summary:A two or more chemically different homopolymers attached to a single junction point form a macromolecule of miktoarm star copolymer. The model of such copolymer composed of an arbitrary number of types of homopolymer arms is considered. The lengths distributions of arms are assumed to be arbitrary, provided that average length of an each arm is long enough. The algorithm is suggested to find the contributions into the Landau free energy of this copolymer melt which are necessary to obtain a phase diagram in weak segregation regime. Using this algorithm the contributions are found up to the fourth order. The phase diagrams have been constructed for the simple model of AB2 copolymer melt whose macromolecules consist of polydisperse A-block and two monodisperse B-blocks. ► The miktoarm star copolymer composed of an arbitrary number of types of homopolymers is considered. ► The procedure is proposed for finding the Landau free energy of this copolymer melt. ► The phase diagrams have been obtained for AB2 miktoarm star melt with polydisperse A-block. ► The temperature of the order-disorder transition increases as polydispersity index grows.
ISSN:0378-4371
1873-2119
DOI:10.1016/j.physa.2011.05.013