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Microphase separation in multigraft copolymer melts studied by random-phase approximation and self-consistent field

Liquan Wang¹, Liangshun Zhang, Jiaping Lin

¹Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.

The Journal of Chemical Physics

|December 3, 2008

Summary

The number of graft arms on multigraft copolymers significantly impacts their phase behavior. Increasing graft arms alters phase transitions, domain size, and interfacial width, aligning with experimental data.

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Area of Science:

Polymer Science
Materials Chemistry
Computational Chemistry

Background:

Multigraft copolymers exhibit complex phase behavior influenced by molecular architecture.
Understanding microphase separation is crucial for designing advanced polymeric materials.

Purpose of the Study:

To investigate the effect of graft arm number on the microphase separation of AB multigraft copolymers.
To analyze changes in phase behavior, domain size, and interfacial width with varying graft densities.

Main Methods:

Utilized random-phase approximation (RPA) theory.
Employed real-space implemented self-consistent field (SCF) theory for calculations.

Main Results:

The number of graft arms per junction significantly influences copolymer phase behavior.
Increasing graft arms shifts the spinodal and narrows the ordered region.
Domain size decreases, and interfacial width increases with more graft arms.

Conclusions:

Theoretical predictions show good agreement with existing experimental observations for strongly segregated systems.
Graft arm density is a critical parameter controlling the morphology of multigraft copolymers.