A study of electro‐optical properties of PDLC films prepared by dual UV and heat curing

Ding, Xiaokang; Cao, Man; Liu, Huijing; Cao, Hui; Li, Wenbo; Yang, Huai

doi:10.1080/02678290802028849

Cited by 22 publications

(2 citation statements)

References 14 publications

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“…The methods used in preparing PDLC films are divided into two classes. The first one uses an emulsion method [5][6][7][8][9][10] which consists in obtaining a polymer including LC domains, after evaporation of the solvent, from a homogeneous mixture of the polymer and the liquid crystal (LC) material. The second one includes all the processes that involve the phase separation of the LC and the polymer matrix from a homogeneous solution.…”

Section: Introductionmentioning

confidence: 99%

Photo-differential Scanning Calorimetry Study on Photopolymerization of Polyacrylate/E7 Liquid Crystal Blends

Bélaid

Méchernène

Abdoune

et al. 2018

Journal of Macromolecular Science, Part B

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Photo-differential scanning calorimetry (photo-DSC) was used to investigate the cure kinetics of a photo-initiated polymerization of tripropylene glycol diacrylate (TPGDA) monomers mixed with a eutectic liquid crystal mixture, E7, chosen due to its significant optical properties. The thermal photo-polymerization reactions were performed in isothermal mode in order to identify and evaluate the different thermal effects occurring during the photo-polymerization reaction under UV light. The results obtained help to better understand the curing mechanisms as well as the kinetics of the curing reactions. The isothermal photo-DSC provided complex thermograms showing the presence of two thermal effects: an exothermic heat (positive activation energy) generated during the conversion of monomers and an endothermic heat produced by the UV lamp. The latter phenomenon was observed in our previous work and was associated to the heating of the polymer dispersed liquid crystals (PDLC) material by the UV irradiation lamp. The dependence of photopolymerization on the time and intensities of the curing UV light were investigated. The results showed that the high intensity UV light heats the material and slows the process of phase separation which, in turn, affects the electro-optical properties of the material under study. The photo DSC results also revealed that the heating of the system was insignificant and can, therefore, be neglected, for materials exposed to UV radiation with an irradiation time of 5 seconds and a low intensity of 13.80 mW/cm 2 .

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Section: Introductionmentioning

confidence: 99%

Photo-differential Scanning Calorimetry Study on Photopolymerization of Polyacrylate/E7 Liquid Crystal Blends

Bélaid

Méchernène

Abdoune

et al. 2018

Journal of Macromolecular Science, Part B

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“…Polymerization-induced phase separation (PIPS), which involves polymerization in an initially homogeneous polymeric syrup containing reactive monomers and nonreactive molecules and forms a phase-separated structure simultaneously, is normally simple and accomplished within one step . It has been extensively applied in a broad range of polymer-based materials, such as polymer-dispersed liquid crystals (PDLC), − thermoplastics-toughened epoxy resin, , porous cyanurate, or dicyclopentadiene thermosets . Furthermore, because of the compatibility of the polymeric syrup with a variety of substrates ranging from rigid glass to flexible films, this method can be compromised with solution-based techniques such as spin-casting, inkjet printing, and spraying.…”

Section: Introductionmentioning

confidence: 99%

A Facile All-Solution-Processed Surface with High Water Contact Angle and High Water Adhesive Force

Chen

Liang

Zou

et al. 2017

ACS Appl. Mater. Interfaces

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A series of sticky superhydrophobicity surfaces with high water contact angle and high water adhesive force is facilely prepared via an all-solution-processed method based on polymerization-induced phase separation between liquid crystals (LCs) and epoxy resin, which produces layers of epoxy microspheres (EMSs) with nanofolds on the surface of a substrate. The morphologies and size distributions of EMSs are confirmed by scanning electron microscopy. Results reveal that the obtained EMS coated-surface exhibits high apparent contact angle of 152.0° and high water adhesive force up to 117.6 μN. By varying the composition of the sample or preparing conditions, the sizes of the produced EMSs can be artificially regulated and, thus, control the wetting properties and water adhesive behaviors. Also, the sticky superhydrophobic surface exhibits excellent chemical stability, as well as long-term durability. Water droplet transportation experiments further prove that the as-made surface can be effectively used as a mechanical hand for water transportation applications. Based on this, it is believed that the simple method proposed in this paper will pave a new way for producing a sticky superhydrophobic surface and obtain a wide range of use.

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Effect of molecular weight of macro‐iniferter on electro‐optical properties of polymer dispersed liquid crystal films prepared by iniferter polymerization

Yan

et al. 2009

J Polym Sci B Polym Phys

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Polymer dispersed liquid crystal (PDLC) films were prepared by a devised method, in which photo‐polymerization induced phase separation in a mixtures of a macro‐iniferter, methyl acrylater, and liquid crystal. The morphology of the obtained PDLC films was examined on a polarized optical microscopy, and the effect of molecular weight of MIs on the electro‐optical properties was deliberately investigated. Decreasing the molecular weight of MIs in the films led to formation of larger liquid crystal droplets and a lower Vth values. Vsat increased and the memory effect decreased because of the increased interface anchoring strength induced by the higher molecular weight of polymer matrices. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 1530–1534, 2009

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A study of electro‐optical properties of PDLC films prepared by dual UV and heat curing

Cited by 22 publications

References 14 publications

Photo-differential Scanning Calorimetry Study on Photopolymerization of Polyacrylate/E7 Liquid Crystal Blends

Photo-differential Scanning Calorimetry Study on Photopolymerization of Polyacrylate/E7 Liquid Crystal Blends

A Facile All-Solution-Processed Surface with High Water Contact Angle and High Water Adhesive Force

Effect of molecular weight of macro‐iniferter on electro‐optical properties of polymer dispersed liquid crystal films prepared by iniferter polymerization

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