Effect of oligomeric photoinitiator on the preperation and electro-optical property of polymer-dispersed liquid crystal

Seok, Jihye; Ryu, Hyeon Sool; Seo, Hojun; Kim, W.S; Lee, D.H; Min, Kyung‐Eun; Seo, Kap-Ho; Kang, Inn‐Kyu; Park, L.S

doi:10.1016/s0925-3467(02)00213-6

Cited by 14 publications

(3 citation statements)

References 4 publications

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“…[1][2][3] However, polymer dispersed liquid crystals (PDLC) containing micron-size liquid crystal (LC) droplets in polymer matrix, [4][5][6][7] or polymer network liquid crystals (PNLC) containing dispersed polymer network in LC, are promising new materials for application in the field of thermo-and electro-optical devices, such as optic shutters, switchable windows and display devices. Addition of a low molecular weight LC into a polymeric matrix results in an electro-and thermo-sensitive material in which the dispersed mesophase can be switched from opaque scattering state to transparent state due to matching of the refractive index of the polymer and the oriented LC [8][9][10][11][12][13] by applying an external field (electrical voltage or thermal gradient). As it is well known, the electro-optical properties of PDLC depend strongly on shape, size, size distribution and orientation of LC domains as well as the interactions between the LC droplets and the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Thermally reversible materials based on thermosetting systems modified with polymer dispersed liquid crystals for optoelectronic application

Tercjak

Serrano

Mondragón

2006

Polymers for Advanced Techs

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The main aim of this research was the generation of new intelligent materials, in this case thermoreversible material, based on an epoxy matrix modified with liquid crystal for optoelectronic application. The samples were prepared by the reaction-induced phase separation (RIPS) of a solution of 4(-(hexyloxy)-4-biphenyl-carbonitrile (HOBC) and polystyrene (PS) in diglicydylether of bisphenol-A epoxy resin (DGEBA). The systems were cured with a stoichiometric amount of an aromatic amine hardener, 4,4(-methylene bis(3-chloro-2,6-diethylaniline) (MCDEA). Taken into account results obtained by differential scanning calorimetry (DSC) and transmission optical microscopy (TOM) equipped with a hot stage it was found that depending on morphology generated by RIPS of HOBC/thermoplastic particles in the epoxy matrix thermally reversible light scattering (TRLS) material can be obtained.

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Section: Introductionmentioning

confidence: 99%

Thermally reversible materials based on thermosetting systems modified with polymer dispersed liquid crystals for optoelectronic application

Tercjak

Serrano

Mondragón

2006

Polymers for Advanced Techs

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“…In the past decades, many works have been done to improve the EO properties of PDLCs. [8][9][10][11] However, PDLCs with excellent EO parameters are still hard to obtain currently. Consequently, the development of PDLCs is still retarded.…”

Section: Introductionmentioning

confidence: 99%

Effect of rGO on polymer-dispersed liquid crystal fabricated by RAFT polymerisation

Zhang

Shao

et al. 2015

Liquid Crystals

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In this study, we demonstrated that doping polymer matrix with a small amount of reduced graphene oxide (rGO) component (0.05-0.2%) had significant influence on the polymerisation kinetics and electro-optical performances of polymer-dispersed liquid crystal films (PDLCs) fabricated with macro reversible addition-fragmentation chain transfer agents. The effects of rGO content were studied in terms of morphology, compound viscosity, polymer conductivity, polymerisation kinetics and driving voltage of PDLCs. The results exhibited that higher rGO content increased the compound viscosity and the entire process proceeded slowly. Furthermore, the addition of rGO increased the polymer conductivity and local electric field, and reduced the saturation voltage as well as the threshold voltage from 27.3 to 19.5 V and 13.2 to 6.41 V, respectively.

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“…One of the most important factors determining the electro-optical properties of PDLC is its morphology which is strongly affected by the prepolymer composition, solubility between the LC and prepolymer, the polymerization kinetics, and the phase separation mechanism [17][18][19][20][21][22][23][24][25][26][27]. For the PDLC films prepared using thiolene systems, the droplet morphology and structural parameters such as droplet size, shape, distribution and density can be varied with the chemical characteristics of the prepolymer and polymerization kinetics.…”

Section: Introductionmentioning

confidence: 99%

Effects of Molar Ratios of Thiol-Ene Monomers on the Morphology and Electro-Optical Properties of Polymer Dispersed Liquid Crystal Films

Park¹,

Cho²,

Hong³

2013

OJOPM

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We synthesized tetrafunctional allyl ether monomer (4-AE) and investigated the effects of the different molar ratios of trimethylolpropane tris-(3-mercaptopropionate) (3-SH) to 4-AE on the photopolymerization behavior, morphology, and electro-optical properties of thiol-ene-based PDLC films. Photo-DSC and DSC analyses revealed that the PDLC sample containing 45 wt% 3-SH and 45 wt% 4-AE gave the highest exotherm, the fastest photocure rate, and the highest T g due to the matched stoichiometry. Morphological observations and electro-optical measurements showed that the PDLC sample with the matched molar ratio gave the smallest LC droplet size, the highest threshold, driving voltages, and lowest saturation transmittance because the orientation of LC molecules got difficulty in small droplets. The stoichiometric ratios of 3-SH to 4-AE played an important role in controlling the photocure rate, phase separation rate, microstructures of LC droplets, and electro-optical properties of thiol-ene-based PDLC systems.

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Effect of oligomeric photoinitiator on the preperation and electro-optical property of polymer-dispersed liquid crystal

Cited by 14 publications

References 4 publications

Thermally reversible materials based on thermosetting systems modified with polymer dispersed liquid crystals for optoelectronic application

Thermally reversible materials based on thermosetting systems modified with polymer dispersed liquid crystals for optoelectronic application

Effect of rGO on polymer-dispersed liquid crystal fabricated by RAFT polymerisation

Effects of Molar Ratios of Thiol-Ene Monomers on the Morphology and Electro-Optical Properties of Polymer Dispersed Liquid Crystal Films

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