Liquid crystal alignment behavior on transparent cellulose films

Kang, Hyo; Lee, Jong-Chan; Nam, Byeong‐Uk; Bae, Jin-Woo

doi:10.1039/c5ra03713a

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…It can be seen from the plots that the HTABP-PI alignment layers endowed the LC cells good VHR features with the values higher than 97% at room temperature. LC cells with the PI-3 alignment layer showed the highest VHR value of 98.36%, whereas those with PI-2 showed the lowest one of 97.43%, which is comparable to those of commercial PI alignment layers (97.10% for SE-7492K, Nissan Chemical, Japan) [44]. It has been revealed that the VHR feature of LC cells is influenced by the charge transfer (CT) behaviors in the PI alignment layers [45].…”

Section: Optical and Electro-optical Propertiesmentioning

confidence: 68%

Synthesis and characterization of soluble ester-containing polyimide alignment layers with high voltage holding ratio features and potential applications in TFT-LCDs

Zhi¹,

Bi²,

Liu³

et al. 2019

Express Polym. Lett.

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Polyimide (PI) represents a class of high performance heteroaromatic polymers characterized by excellent thermal and environmental stability, high mechanical and dielectric properties as well as flexible molecular structure designability [1-3]. Various functionalities have been achieved for PIs via elaborate combination of specific dianhydride and diamine monomers so as to meet the property demands of high-tech applications [4-6]. Among the various functional PIs, semi-alicyclic PIs derived from alicyclic dianhydrides and aromatic diamines proved to possess the best combined properties considering the polymerization reactivity and the acidity/basicity of the starting monomers [7]. Thus, such kinds of semi-alicyclic PIs usually exhibited superior thermal and mechanical properties, and higher molecular weights to their analogous PIs derived from aromatic dianhydrides and alicyclic diamines or from both of alicyclic dianhydride and diamines [8]. Good comprehensive properties of semi-alicyclic PIs derived from alicyclic dianhydrides and aromatic diamines make them much attractive in optoelectronic fields in recent years [9-11]. The successful 923

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Section: Optical and Electro-optical Propertiesmentioning

confidence: 68%

Synthesis and characterization of soluble ester-containing polyimide alignment layers with high voltage holding ratio features and potential applications in TFT-LCDs

Zhi¹,

Bi²,

Liu³

et al. 2019

Express Polym. Lett.

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show abstract

“…For example, the introduction of coumarin as a dye [ 74 ], oryzanol as a plant extraction resource [ 75 ], and the imide moieties [ 76 ] into the side chain of polystyrene improves the T g value. PS derivatives have been enhanced via a simple polymer reaction to produce vertical LC orientation layers for next-generation applications owing to their advantages, such as low-temperature processability and good solubility in many organic solvents [ 77 ]. The molecular orientation of polymers, such as isomeric groups on polymeric surfaces, is an important factor in inducing LC aligning behavior because of the interactions and/or steric repulsions between the polymer surface and the LC molecule [ 78 , 79 ].…”

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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“…However, future designs of high performance, 3D, low energy consuming displays will not rely on alignment layers to bring about uniform alignment and fast response of LC molecules. The major reason for the need of a new design strategy is that alignment layers in these displays cause transmittance degradation, refractive index mismatching, undesired capacitance, and low thermal and physical stability . As a result, techniques must be uncovered to rapidly align LC molecules on electrode substrates, without any defects over large areas, without utilizing polymer layers .…”

mentioning

confidence: 99%

Polymer‐Layer‐Free Alignment for Fast Switching Nematic Liquid Crystals by Multifunctional Nanostructured Substrate

et al. 2015

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A novel polymer-layer-free system for liquid-crystal alignment is demonstrated by various shaped indium tin oxide (ITO) patterns. Liquid crystals are aligned along the ITO line pattern and secondary sputtering lithography can change the shape of the ITO line pattern. Different shapes can control the direction and size of the pretilt angle. This effect eliminates defects and reduces the response time.

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Liquid crystal alignment behavior on transparent cellulose films

Abstract: The liquid crystal (LC) alignment properties of LC cells fabricated with plant-based cellulose films were investigated.

Cited by 4 publications

References 29 publications

Synthesis and characterization of soluble ester-containing polyimide alignment layers with high voltage holding ratio features and potential applications in TFT-LCDs

Synthesis and characterization of soluble ester-containing polyimide alignment layers with high voltage holding ratio features and potential applications in TFT-LCDs

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

Polymer‐Layer‐Free Alignment for Fast Switching Nematic Liquid Crystals by Multifunctional Nanostructured Substrate

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