Liquid crystal alignment behaviors on capsaicin substituted polystyrene films

Ju, Changha; Kim, Tae-Hyung; Kang, Hyo

doi:10.1039/c7ra08321a

Cited by 11 publications

(11 citation statements)

References 57 publications

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“…Figure 1 shows the synthetic routes to the PEUG100 and copolymers (PEUG80, PEUG60, PEUG40, and PEUG20). The copolymers that had different degrees (%) of substitution were obtained by varying the amounts of eugenol in the reaction as previously reported similar procedure [ 48 ]. Conversions of nearly 100% from chloromethyl to eugenyl methyl ether were obtained when 150 mol % of eugenol was used at 75 °C for 24 h. The chemical constituents of monomeric units in PEUG# were checked by 1 H NMR spectra.…”

Section: Resultsmentioning

confidence: 99%

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Renewable, Eugenol—Modified Polystyrene Layer for Liquid Crystal Orientation

Kim

Kang

2018

Polymers

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Abstract:We synthesized a series of plant-based and renewable, eugenol-modified polystyrene (PEUG#) (# = 20, 40, 60, 80, and 100, in which # is the molar content of the eugenol moiety in the side group). Eugenol is extracted from clove oil. We used polymer modification reactions to determine the liquid crystal (LC) orientation properties of the polymer films. In general, the LC cells fabricated using the polymer films with a higher molar content of eugenol side groups exhibited vertical LC orientation behavior. The vertical orientation behavior was well correlated with the surface energy value of the polymer films. The vertical LC orientation could be formed due to the low polar surface energy value on the polymer film generated by the nonpolar carbon group. Electro-optical performances (e.g., voltage holding ratio (VHR), residual DC voltage (R-DC), and thermal orientation stabilities) were good enough to be observed for LC cells using PEUG100 polymer as an eco-friendly LC orientation material.

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Section: Resultsmentioning

confidence: 99%

“…The following procedure was used to synthesize all the PEUG#, in which # represents the molar content (%) of the eugenol moiety in the side group as previously reported in a similar procedure [ 48 ]. The synthesis of the PEUG100 is given as an example.…”

Section: Methodsmentioning

confidence: 99%

Renewable, Eugenol—Modified Polystyrene Layer for Liquid Crystal Orientation

Kim

Kang

2018

Polymers

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“…For example, the vertical orientation of LC molecules in LC cells fabricated with PS derivatives substituted with natural extracts such as capsaicin, eugenol, and vanillin, was observed when the substituent ratio was larger than 60 mol%. This is due to the long alkyl groups of the natural extracts, which are related to low surface energy owing to the steric effect of alkyl groups on the polymer film surface [ 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. The surface energy of polymer films and the molecular orientation of the polymers are decisive factors in obtaining vertical LC orientation behavior due to steric repulsion and/or interactions between LC molecules and surfaces [ 49 , 50 ].…”

Section: Introductionmentioning

confidence: 99%

Vertical Orientation of Liquid Crystal on Comb-Like 4-(trans-4-alkylcyclohexyl)phenoxymethyl-substituted Polystyrene Containing Liquid Crystal Precursor

Seo

Kang

2021

Polymers

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We synthesized a series of polystyrene derivatives modified with precursors of liquid crystal (LC) molecules, including 4-(trans-4-ethylcyclohexyl)phenol (homopolymer PECH and copolymer PECH#; # = 5, 10, 15, 20, 40, 60, and 80, where # indicates the molar fraction of 4-(trans-4-ethylcyclohexyl)phenoxymethyl in the side chain), 4-(trans-4-propylcyclohexyl)phenol (PPCH), 4-(trans-4-butylcyclohexyl)phenol (PBCH), and 4-(trans-4-amylcyclohexyl)phenol (PAmCH) via polymer modification reactions in order to investigate the orientation of LC molecules on polymer films exhibiting part of the LC molecular structure. A stable and uniform vertical orientation of LC molecules was observed in LC cells fabricated with PECH#, having 15 mol% or more of 4-(trans-4-ethylcyclohexyl)phenoxymethyl side groups. In addition, the vertical orientation of LC molecules was observed in LC cells fabricated with homopolymers of PECH, PPCH, PBCH, and PAmCH. The water contact angle on the polymer films could be associated with the vertical orientation of the LC molecules in the LC cells fabricated with polymer films. For example, a vertical LC orientation was observed when the water contact angle of the polymer films was higher than ~81°. Good orientation stability was observed at 200 °C and 15 mW/cm2 of UV irradiation for LC cells fabricated with PECH films.

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“…Liquid crystal (LC) molecules have been extensively studied owing to their unique and attractive characteristics, such as solid-like ordering and liquid-like fluidity [ 56 ]. LC molecules have been known to exhibit anisotropic physico-chemical characteristics, such as optical and dielectric anisotropy, generated by external stimuli because of their interesting chemical structures [ 57 ]. Therefore, LC molecules have been used in various areas, such as information technology, energy and environmental technology, nanotechnology, and biotechnology, using their unique physico-chemical properties [ 58 , 59 ].…”

Section: Introductionmentioning

confidence: 99%

Alignment Layer of Liquid Crystal Using Plant-Based Isoeugenol-Substituted Polystyrene

2021

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We synthesized a series of renewable and plant-based isoeugenol-substituted polystyrenes (PIEU#, # = 100, 80, 60, 40, and 20, where # is the molar percent content of isoeugenol moiety), using polymer modification reactions to study their liquid crystal (LC) alignment behavior. In general, the LC cells fabricated using polymer film with a higher molar content of isoeugenol side groups showed vertical LC alignment behavior. This alignment behavior was well related to the surface energy value of the polymer layer. For example, vertical alignments were observed when the polar surface energy value of the polymer was smaller than approximately 3.59 mJ/m2, generated by the nonpolar isoeugenol moiety with long and bulky carbon groups. Good alignment stability at 100 °C and under ultraviolet (UV) irradiation of 15 J/cm2 was observed for the LC cells fabricated using PIEU100 as a LC alignment layer. Therefore, renewable isoeugenol-based materials can be used to produce an eco-friendly vertical LC alignment system.

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Liquid crystal alignment behaviors on capsaicin substituted polystyrene films

Abstract: The liquid crystal (LC) alignment behavior on plant-based capsaicin substituted polystyrene film was investigated. This can give the basic idea for the design of eco-friendly LC alignment layer based on renewable resource containing polymer film.

Cited by 11 publications

References 57 publications

Renewable, Eugenol—Modified Polystyrene Layer for Liquid Crystal Orientation

Renewable, Eugenol—Modified Polystyrene Layer for Liquid Crystal Orientation

Vertical Orientation of Liquid Crystal on Comb-Like 4-(trans-4-alkylcyclohexyl)phenoxymethyl-substituted Polystyrene Containing Liquid Crystal Precursor

Alignment Layer of Liquid Crystal Using Plant-Based Isoeugenol-Substituted Polystyrene

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