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Characteristics and Nomenclature of Copolymers

Characteristics and Nomenclature of Copolymers

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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Electrically Tunable Soft-Solid Block Copolymer Structural Color.

Tae Joon Park¹, Sun Kak Hwang¹, Sungmin Park²

¹Department of Materials Science and Engineering, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea.

|October 28, 2015

Summary

This summary is machine-generated.

Researchers developed flexible, color-switching polymer films using ionic liquid-swollen block copolymers. These films offer tunable structural color (SC) via electric fields, enabling full-color displays with excellent stability.

Keywords:

block copolymers electrically switchable structural color flexible photonic crystals low operation voltage soft-solid structural colored film

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

One-dimensional photonic crystals are widely studied but fabricating flexible, electro-active structural color (SC) polymer films remains a challenge.
Block copolymers (BCPs) offer potential for SC applications due to their self-assembly properties.

Purpose of the Study:

To demonstrate free-standing, electric field-tunable structural color films using ionic liquid (IL) swollen block copolymers.
To achieve full-color structural color (SC) by controlling the swelling of block copolymer domains.

Main Methods:

Utilized a self-assembled poly(styrene-block-quaternized 2-vinylpyridine) (PS-b-QP2VP) copolymer SC film.
Developed a polymer/ionic liquid film-reservoir adjacent to the SC film to control QP2VP domain swelling.
Employed a metal/IL reservoir/SC film/IL reservoir/metal capacitor device to apply voltages (-3 to +6 V) for color tuning.

Main Results:

Achieved red, green, and blue (RGB) full-color SC films through IL-induced swelling of QP2VP domains.
Demonstrated mechanically flexible SC films with excellent color stability over several days.
Showcased selective swelling control via IL-to-polymer ratio in the reservoir and applied voltage.

Conclusions:

Successfully fabricated flexible, electro-active structural color polymer films.
The developed system allows for tunable full-color displays with good stability.
This approach offers a promising route for advanced optical materials and devices.