Vertical Orientation of Liquid Crystal on Polystyrene Substituted with <i>n</i>-Alkylbenzoate-<i>p</i>-oxymethyl Pendant Group as a Liquid Crystal Precursor
We synthesized a series of polystyrene derivatives modified with precursors of liquid crystal (LC) molecules via polymer modification reactions. Thereafter, the orientation of the LC molecules on the polymer films, which possess part of the corresponding LC molecular structure, was investigated syst...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-06-01
|
| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/13/13/2058 |
| _version_ | 1797529005508788224 |
|---|---|
| author | Kyutae Seo Hyo Kang |
| author_facet | Kyutae Seo Hyo Kang |
| author_sort | Kyutae Seo |
| collection | DOAJ |
| description | We synthesized a series of polystyrene derivatives modified with precursors of liquid crystal (LC) molecules via polymer modification reactions. Thereafter, the orientation of the LC molecules on the polymer films, which possess part of the corresponding LC molecular structure, was investigated systematically. The precursors and the corresponding derivatives used in this study include ethyl-<i>p</i>-hydroxybenzoate (homopolymer P2BO and copolymer P2BO#, where # indicates the molar fraction of ethylbenzoate-<i>p</i>-oxymethyl in the side chain (# = 20, 40, 60, and 80)), <i>n</i>-butyl-<i>p</i>-hydroxybenzoate (P4BO), <i>n</i>-hexyl-<i>p</i>-hydroxybenzoate (P6BO), and <i>n</i>-octyl-<i>p</i>-hydroxybenzoate (P8BO). A stable and uniform vertical orientation of LC molecules was observed in LC cells fabricated with P2BO#, with 40 mol% or more ethylbenzoate-<i>p</i>-oxymethyl side groups. In addition, the LC molecules were oriented vertically in LC cells fabricated with homopolymers of P2BO, P4BO, P6BO, and P8BO. The water contact angle on the polymer films can be associated with the vertical orientation of the LC molecules in the LC cells fabricated with the polymer films. For example, vertical LC orientation was observed when the water contact angle of the polymer films was greater than ~86°. Good orientation stability was observed at 150 °C and with 20 J/cm<sup>2</sup> of UV irradiation for LC cells fabricated with the P2BO film. |
| first_indexed | 2024-03-10T10:07:17Z |
| format | Article |
| id | doaj.art-2e0e8a862a034cdeb59e2a86f37dc29e |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T10:07:17Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-2e0e8a862a034cdeb59e2a86f37dc29e2023-11-22T01:24:22ZengMDPI AGPolymers2073-43602021-06-011313205810.3390/polym13132058Vertical Orientation of Liquid Crystal on Polystyrene Substituted with <i>n</i>-Alkylbenzoate-<i>p</i>-oxymethyl Pendant Group as a Liquid Crystal PrecursorKyutae Seo0Hyo Kang1BK-21 Four Graduate Program, Department of Chemical Engineering, Dong-A University, 37 Nakdong-Daero 550 Beon-gil, Saha-gu, Busan 49315, KoreaBK-21 Four Graduate Program, Department of Chemical Engineering, Dong-A University, 37 Nakdong-Daero 550 Beon-gil, Saha-gu, Busan 49315, KoreaWe synthesized a series of polystyrene derivatives modified with precursors of liquid crystal (LC) molecules via polymer modification reactions. Thereafter, the orientation of the LC molecules on the polymer films, which possess part of the corresponding LC molecular structure, was investigated systematically. The precursors and the corresponding derivatives used in this study include ethyl-<i>p</i>-hydroxybenzoate (homopolymer P2BO and copolymer P2BO#, where # indicates the molar fraction of ethylbenzoate-<i>p</i>-oxymethyl in the side chain (# = 20, 40, 60, and 80)), <i>n</i>-butyl-<i>p</i>-hydroxybenzoate (P4BO), <i>n</i>-hexyl-<i>p</i>-hydroxybenzoate (P6BO), and <i>n</i>-octyl-<i>p</i>-hydroxybenzoate (P8BO). A stable and uniform vertical orientation of LC molecules was observed in LC cells fabricated with P2BO#, with 40 mol% or more ethylbenzoate-<i>p</i>-oxymethyl side groups. In addition, the LC molecules were oriented vertically in LC cells fabricated with homopolymers of P2BO, P4BO, P6BO, and P8BO. The water contact angle on the polymer films can be associated with the vertical orientation of the LC molecules in the LC cells fabricated with the polymer films. For example, vertical LC orientation was observed when the water contact angle of the polymer films was greater than ~86°. Good orientation stability was observed at 150 °C and with 20 J/cm<sup>2</sup> of UV irradiation for LC cells fabricated with the P2BO film.https://www.mdpi.com/2073-4360/13/13/2058anisotropic materialliquid crystalorientation layerpolystyrene<i>n</i>-alkyl-<i>p</i>-hydroxybenzoate |
| spellingShingle | Kyutae Seo Hyo Kang Vertical Orientation of Liquid Crystal on Polystyrene Substituted with <i>n</i>-Alkylbenzoate-<i>p</i>-oxymethyl Pendant Group as a Liquid Crystal Precursor Polymers anisotropic material liquid crystal orientation layer polystyrene <i>n</i>-alkyl-<i>p</i>-hydroxybenzoate |
| title | Vertical Orientation of Liquid Crystal on Polystyrene Substituted with <i>n</i>-Alkylbenzoate-<i>p</i>-oxymethyl Pendant Group as a Liquid Crystal Precursor |
| title_full | Vertical Orientation of Liquid Crystal on Polystyrene Substituted with <i>n</i>-Alkylbenzoate-<i>p</i>-oxymethyl Pendant Group as a Liquid Crystal Precursor |
| title_fullStr | Vertical Orientation of Liquid Crystal on Polystyrene Substituted with <i>n</i>-Alkylbenzoate-<i>p</i>-oxymethyl Pendant Group as a Liquid Crystal Precursor |
| title_full_unstemmed | Vertical Orientation of Liquid Crystal on Polystyrene Substituted with <i>n</i>-Alkylbenzoate-<i>p</i>-oxymethyl Pendant Group as a Liquid Crystal Precursor |
| title_short | Vertical Orientation of Liquid Crystal on Polystyrene Substituted with <i>n</i>-Alkylbenzoate-<i>p</i>-oxymethyl Pendant Group as a Liquid Crystal Precursor |
| title_sort | vertical orientation of liquid crystal on polystyrene substituted with i n i alkylbenzoate i p i oxymethyl pendant group as a liquid crystal precursor |
| topic | anisotropic material liquid crystal orientation layer polystyrene <i>n</i>-alkyl-<i>p</i>-hydroxybenzoate |
| url | https://www.mdpi.com/2073-4360/13/13/2058 |
| work_keys_str_mv | AT kyutaeseo verticalorientationofliquidcrystalonpolystyrenesubstitutedwithinialkylbenzoateipioxymethylpendantgroupasaliquidcrystalprecursor AT hyokang verticalorientationofliquidcrystalonpolystyrenesubstitutedwithinialkylbenzoateipioxymethylpendantgroupasaliquidcrystalprecursor |