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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

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Microphase separation in comblike liquid-crystalline diblock copolymers.

S K Mkhonta¹, K R Elder, Zhi-Feng Huang

¹Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA and Department of Physics, University of Swaziland, Private Bag 4, Kwaluseni M201, Swaziland.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|November 16, 2013

Summary

This summary is machine-generated.

Researchers studied liquid crystals in polymers using a model. Electric fields can control polymer self-assembly and change material properties by aligning liquid-crystal molecules.

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Area of Science:

Polymer Science
Materials Science
Liquid Crystals

Background:

Comblike liquid-crystalline diblock copolymers exhibit complex phase behavior.
Understanding the interplay between liquid crystallinity and microphase separation is crucial for material design.

Purpose of the Study:

To investigate the influence of electric fields on liquid-crystalline diblock copolymers.
To explore the self-assembly mechanisms and domain morphology under external stimuli.

Main Methods:

Utilized a Brazovskii-type phenomenological model.
Employed both analytical and numerical calculation techniques.
Investigated symmetric and asymmetric diblock copolymer systems.

Main Results:

Determined a critical electric field for reorienting liquid crystals in symmetric copolymers, leading to changes in lamellar periodicity.
Demonstrated that electric fields can direct self-assembly of aligned polymer lamellar domains when liquid-crystal ordering precedes microphase separation.
Observed coexistence of phase separation and liquid-crystal nematic networks in asymmetric copolymers.

Conclusions:

Electric field-induced reorientation offers a method to control lamellar periodicity in liquid-crystalline diblock copolymers.
Weak electric fields are effective in directing self-assembly due to dielectric anisotropy.
Copolymer and liquid-crystal coupling dictates domain morphology in asymmetric systems.