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Self-organized wrinkling of liquid crystalline polymer with plasma treatment

Published online by Cambridge University Press:  05 November 2018

Jaehyun Sim ,
Sihwa Oh ,
Se-Um Kim ,
Kyuyoung Heo ,
Seung-Chul Park  and
Jun-Hee Na Open the ORCID record for Jun-Hee Na [Opens in a new window]
Jaehyun Sim
Affiliation:
Department of Electric, Electronic and Communication Engineering Education, Chungnam National University, Daejeon 34134, Republic of Korea
Sihwa Oh
Affiliation:
Department of Electric, Electronic and Communication Engineering Education, Chungnam National University, Daejeon 34134, Republic of Korea
Se-Um Kim
Affiliation:
Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
Kyuyoung Heo
Affiliation:
Reliability Assessment Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea
Seung-Chul Park
Affiliation:
Department of Nature Inspired Nanoconvergence Systems, Korea Institute of Machinery and Materials, Daejeon 34103, Republic of Korea
Jun-Hee Na*
Affiliation:
Department of Electric, Electronic and Communication Engineering Education, Chungnam National University, Daejeon 34134, Republic of Korea; and Department of Convergence System Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
*
a)Address all correspondence to this author. e-mail: junhee.na@cnu.ac.kr
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Abstract

Highly ordered wrinkling morphologies of liquid crystalline polymer films are demonstrated based on simple multi-rubbing. The spontaneous pattern formation of periodic wrinkling morphology is achieved through utilizing plasma treatment on a predefined alignment layer. The multi-directional ordering on the alignment layer obtained through selectively covering the alignment layer with a protective layer, which is chemically inert and keeps alignment properties during another rubbing process. The ordering of the wrinkle pattern can be tailored through a molecular orientation of liquid crystal (LC) and a process condition, including film thickness, plasma treatment, and rubbing. The proposed methods enable the spontaneous pattern formation of well-aligned one- or two-dimensionally periodic microstructures over a large area, without an additional template or patterning steps. Since the LC polymer incorporated the optical anisotropic mesogenic groups into polymer chains, it has an optical birefringence in the film and it can be utilized for optical devices requiring a microstructure on a surface.

Keywords

liquid crystalmicrostructurepolymerization
Type
Invited Paper
Information
Journal of Materials Research , Volume 33 , Issue 23 , 14 December 2018 , pp. 4092 - 4100
Copyright
Copyright © Materials Research Society 2018 

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