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Microphase separation in polydisperse rod-rod diblock copolymer melt.

M A Aliev¹, N Yu Kuzminyh¹

¹Institute of Biochemical Physics, 4 Kossygina st., 119334 Moscow, Russia.

The Journal of Chemical Physics

|September 3, 2015

Summary

This summary is machine-generated.

Polydisperse rod-rod AB diblock copolymers are less stable than monodisperse ones, favoring nematic and microphase separated states. Interaction strengths significantly impact phase boundary curves.

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Area of Science:

Polymer Science
Materials Science
Statistical Mechanics

Background:

Rod-rod AB diblock copolymers exhibit complex phase behaviors.
Understanding polymer melt stability is crucial for material design.
Polydispersity can significantly alter macroscopic properties.

Purpose of the Study:

To investigate the stability limits of the isotropic state in rod-rod AB polydisperse diblock copolymer melts.
To compare the stability of polydisperse melts with monodisperse counterparts.
To analyze the influence of interaction strengths on phase transitions.

Main Methods:

Application of weak segregation theory.
Modeling block length distribution using the Schulz-Zimm distribution.
Analysis of spinodal curves to determine stability limits.

Main Results:

Copolymer melts with polydisperse rigid blocks are less stable than monodisperse melts.
Polydispersity promotes the formation of nematic and microphase separated states.
The ratio of isotropic to anisotropic interaction strengths strongly influences the isotropic-nematic boundary curves.

Conclusions:

Polydispersity reduces the stability of the isotropic phase in rod-rod AB diblock copolymers.
The degree of polydispersity and interaction anisotropy are key factors governing phase behavior.
Findings provide insights into controlling self-assembly in complex polymer systems.