PDLC with controllable microstructure using wavelength-selective two-stage polymerization

Lu, Hongbo; Huang, Peng; Wu, T. K.; Chen, Cuifen; Shi, Jianzhou; Xu, Miao; Qiu, Longzhen; Ding, Yunsheng; Zhu, Jun

doi:10.1016/j.polymer.2022.124641

Cited by 16 publications

(6 citation statements)

References 48 publications

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“…Thiol monomers led to reduced compatibility of the polymer with LC. [ 52 ] Consequently, the degree of phase separation increased and large liquid crystal domains may be formed, leading to an increase in the size of the porous structure. Furthermore, the presence of large groups containing thiols on the polymer chain drastically reduced the compatibility with LC, which caused the earlier phase separation and agglomeration into microspheres, hampering the formation of a continuous phase.…”

Section: Resultsmentioning

confidence: 99%

“…Eventually, the polymer exhibited a spherical structure. [52] Although the variation of polymer morphology had no obvious effect on the thermal stability, the macro homogeneity of the PSBP samples was destroyed. Generally, liquid crystalline monomers are used to form chemically crosslinked polymer networks.…”

Section: The Psbp Samples Prepared With Different Ratios Of the Liqui...mentioning

confidence: 99%

“…Click chemistry, especially the click reaction of thiol-acrylates, has attracted great attention as a powerful tool for polymer modification and polymerization. [52,54] Click reactions are mainly used to complete the chemical synthesis of molecules through the splicing of small units. During the thiol-acrylate photopolymerization reaction, the acrylic radical participates in the photopolymerization process of a mixture of acrylate and thiol monomers: addition to another acrylate functional group or hydrogen abstraction/chain transfer to thiol.…”

Section: The Psbp Samples Prepared With Different Ratios Of the Liqui...mentioning

confidence: 99%

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Reversible Electrochromic Pattern in 3D Photonic Crystals Film from Thiol‐Acrylate‐Based Polymer‐Stabilized Blue Phase Liquid Crystals

Wang

et al. 2023

Advanced Optical Materials

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mechanical force, and chemical or electrochemical reactions, have attracted much attention in the fields of optoelectronic devices, sensors, anticounterfeiting, displays, and labeling technology. [1][2][3] Among various organic and inorganic materials, chiral liquid crystal-based soft materials have become promising candidates for creating novel photonic crystals with improved stimuli-responsive performance due to their distinctive features of selfassembly, softness, and multiple responsiveness under various stimulus. [4][5][6] Chiral liquid crystalline materials possess self-organized periodic superstructures and selective reflection of circularly polarized light determined by the chiral dopants, thus exhibiting photonic bandgaps (PBGs) with circular dichroism. [7] For 1D PCs, the cholesteric liquid crystals exhibit 1D photonic superstructures and have achieved remarkable research results in dynamic actuation by light, [8][9][10][11][12][13] temperature, [14,15] pH, [16] stretching, [17] or electric. [18,19] Blue phase liquid crystals (BPLCs) with 3D PBG that can control or manipulate the flow of visible light have recently drawn vast and increasing attention. [20] Because of the spontaneous organization inherent of their 3D periodic structures, the fabrication procedures of BPLCs may be easily implemented to achieve high-quality 3D PCs. [21] Thus, it is attractive to the development of 3D photonic nanostructures Endowing advanced 3D photonic nanoarchitectures with dynamic controllability is currently in the spotlight of soft-matter photonics research. Herein, a well-defined photopatterned polymer-stabilized blue phase (PSBP) film with 3D electrically tunable photonic bandgap is fabricated by a liquid crystalline thiol-acrylate monomers system. Remarkably, the addition of thiol monomers can effectively improve the electrical tuning performance of the PSBP film and maintain excellent thermal stability simultaneously. The proportions of acrylate and thiol monomers are proved to be a key factor on the morphology structure of the polymer network in the PSBP system. By masked UV photopolymerization, a patterned sample with a high-quality image and reversible nonsynergistic electrochromism is obtained. With increasing electric field, the patterned region changes from initial green reflection color to a red one, while no obvious visual color change occurs for the shading region with initial blue reflection color. The distinct electrically responsive behaviors are mainly caused by the microstructural difference of polymer networks, which is engendered by the migration of polymerizable monomers during polymerization. The research disclosed herein may provide new insights into the development of patterned 3D self-assembled liquid crystalline photonic crystal toward anticounterfeiting, displays, colorimetric sensors, labeling technology, and programming photonics.

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Section: Resultsmentioning

confidence: 99%

Section: The Psbp Samples Prepared With Different Ratios Of the Liqui...mentioning

confidence: 99%

Section: The Psbp Samples Prepared With Different Ratios Of the Liqui...mentioning

confidence: 99%

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Reversible Electrochromic Pattern in 3D Photonic Crystals Film from Thiol‐Acrylate‐Based Polymer‐Stabilized Blue Phase Liquid Crystals

Wang

et al. 2023

Advanced Optical Materials

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“…This functionality has garnered significant interest for their use in various electro-optical applications, including optical modulators and smart windows. [1][2][3] Several fabrication techniques exist for PDLC devices, including the polymerization initiated phase separation (PIPS) method, temperature induced phase separation (TIPS) method, solvent induced phase separation (SIPS) method, templated cavities method, and liquid crystal microcapsules method. 4 Central to creating an effective PDLC film is ensuring uniform dispersion of liquid crystals within the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

The effect of high dielectric BaTiO₃ nanoparticle dimensions on the dielectric properties and electro-optical performance of polymer dispersed liquid crystal films

Wu,

Sun,

Wang

et al. 2024

J. Mater. Chem. C

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“…It consists of LC droplets smaller than 100 nm and exhibits fast response and highly bendable properties . In addition, Lu et al prepared a PDLC film with high CR and adhesion by wavelength-selective two-stage polymerization of acrylate-thiol …”

Section: Introductionmentioning

confidence: 99%

Polymer-Dispersed Liquid Crystal Films on Flexible Substrates with Excellent Bending Resistance and Spacing Stability

Chen

Zhang

et al. 2022

Langmuir

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Polymer-dispersed liquid crystals (PDLCs) are very attractive due to their electrically switchable properties. However, current PDLC films still have problems such as high driving voltages, low contrast ratio (CR), and poor bending resistance and spacing stability. To solve these problems, a PDLC film with a system of coexisting polymer spacer columns and polymer network was proposed. First, based on the adhesive systems of IBMA and UV6301, the effects of IBMA concentration and LC content on the morphology of the polymer network and the electro-optical properties of PDLC were investigated, respectively. Then, the effects of the process conditions of mask polymerization such as temperature, time, and UV light intensity on the morphology and electro-optical properties of the polymer spacer columns were systematically investigated. It was found that PDLC films with the coexistence system exhibit both excellent electro-optical properties and outstanding bending resistance and spacing stability. Thus, it provides new practical possibilities for the preparation of high-performance PDLC films used in flexible devices.

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PDLC with controllable microstructure using wavelength-selective two-stage polymerization

Cited by 16 publications

References 48 publications

Reversible Electrochromic Pattern in 3D Photonic Crystals Film from Thiol‐Acrylate‐Based Polymer‐Stabilized Blue Phase Liquid Crystals

Reversible Electrochromic Pattern in 3D Photonic Crystals Film from Thiol‐Acrylate‐Based Polymer‐Stabilized Blue Phase Liquid Crystals

The effect of high dielectric BaTiO₃ nanoparticle dimensions on the dielectric properties and electro-optical performance of polymer dispersed liquid crystal films

Polymer-Dispersed Liquid Crystal Films on Flexible Substrates with Excellent Bending Resistance and Spacing Stability

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PDLC with controllable microstructure using wavelength-selective two-stage polymerization

Cited by 16 publications

References 48 publications

Reversible Electrochromic Pattern in 3D Photonic Crystals Film from Thiol‐Acrylate‐Based Polymer‐Stabilized Blue Phase Liquid Crystals

Reversible Electrochromic Pattern in 3D Photonic Crystals Film from Thiol‐Acrylate‐Based Polymer‐Stabilized Blue Phase Liquid Crystals

The effect of high dielectric BaTiO3 nanoparticle dimensions on the dielectric properties and electro-optical performance of polymer dispersed liquid crystal films

Polymer-Dispersed Liquid Crystal Films on Flexible Substrates with Excellent Bending Resistance and Spacing Stability

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Product

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The effect of high dielectric BaTiO₃ nanoparticle dimensions on the dielectric properties and electro-optical performance of polymer dispersed liquid crystal films