New UV/heat dual-curable sealant containing acrylate-epoxy hybrid resin for highly adhesive liquid crystal device

Cho, Chi Hyeong; Son, Injoon; Yoo, Ji Yong; Kim, Jae Hong; Lee, Byungsun; Moon, Gitae; Lee, Eunbi; Lee, Jun Hyup

doi:10.1080/15421406.2019.1597533

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…The addition reaction of AA to the epoxy resin was carried out in order to obtain a hybrid resin containing both epoxy and acrylic groups in the molecule, which will be used in the further part of the research to monitor the course of cationic and radical photopolymerization with the use of various photoinitiators. Herein, the process parameters were developed based on a literature survey [ 26 , 27 , 28 , 29 , 30 ] and several preliminary runs carried out at different reaction temperatures and catalyst doses. The progress of the reaction was monitored by FT-IR spectroscopy.…”

Section: Resultsmentioning

confidence: 99%

Photocurable Epoxy Acrylate Coatings Preparation by Dual Cationic and Radical Photocrosslinking

Bednarczyk¹,

Mozelewska²,

Nowak³

et al. 2021

Materials

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In this work, epoxy acrylate resin (EA) based on the industrial-grade bisphenol A-based epoxy resin (Ep6) and acrylic acid (AA) has been synthesized in order to develop hybrid resin comprising both epoxide group and reactive, terminal unsaturation. Obtained epoxy acrylate prepolymer was employed to formulate photocurable coating compositions containing, besides the EA binder, also cationic or radical photoinitiators. Hence, when cationic photoinitiators were applied, polyether-type polymer chains with pending acrylate groups were formed. In the case of free radical polymerization, epoxy acrylates certainly formed a polyacrylate backbone with pending epoxy groups. Owing to the presence of both epoxy and double carbon–carbon pendant groups, the reaction product exhibits photocrosslinking via two distinct mechanisms: (i) cationic ring-opening polymerization and (ii) free radical polymerization. Therefore, photopolymerization behavior of synthetized hybrid resin with various photoinitiators was determined via photo-differential scanning calorimetry (photo-DSC) and real-time infrared spectroscopy (RT-IR) methods, and properties of cured coatings were investigated. The performance of the following type of photoinitiators was tested in the cationic photopolymerization: diaryliodonium cations or triarylsulfonium cations, and the following type of photoinitiators were used to induce free radical photopolymerization: α-hydroxyketones, acylphosphine oxides, and their mixtures. Lastly, the basic physicomechanical properties of cured coatings, such as tack-free time, hardness, adhesion, gloss, and yellowness index, were evaluated. Some structural factors and parameters of cationic and radical photoinitiators and photopolymerization mechanisms affecting the epoxy acrylate hybrid coatings performance are discussed.

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Section: Resultsmentioning

confidence: 99%

Photocurable Epoxy Acrylate Coatings Preparation by Dual Cationic and Radical Photocrosslinking

Bednarczyk¹,

Mozelewska²,

Nowak³

et al. 2021

Materials

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“…Several factors, such as MAA to epoxy resin feed ratio, amount of catalyst, process temperature, and finally, reaction time, have influenced the progress of addition reaction of the MAA to the epoxy resin. The synthesis parameters were selected based on a literature survey [10,[20][21][22][23] and several preliminary runs carried out at different reaction temperatures and catalyst doses. The best temperature turned out to be 90 • C, and the catalyst dose of 0.8 wt% was assumed as the optimal amount.…”

Section: Synthesis Parameters and Properties Of Obtained Epoxy Methacrylate Resinmentioning

confidence: 99%

“…The final reaction temperature was set to 90 • C, and the process was conducted for 5 h in a nitrogen atmosphere, with stirring. The above synthesis parameters were established based on a literature survey [10,[20][21][22][23] and our own experience [19,36]. The reaction products appear as colorless, transparent, viscous liquids.…”

Section: Synthesis Of Hybrid Oligomer Based On the Epoxy Methacrylate Resinmentioning

confidence: 99%

Synthesis of Epoxy Methacrylate Resin and Coatings Preparation by Cationic and Radical Photocrosslinking

et al. 2021

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This work involves the synthesis of hybrid oligomers based on the epoxy methacrylate resin. The EA resin was obtained by the modification of industrial-grade bisphenol A-based epoxy resin and methacrylic acid has been synthesized in order to develop multifunctional resins comprising both epoxide group and reactive, terminal unsaturation. Owing to the presence of both epoxy and double carbon–carbon pendant groups, the reaction product exhibits photocrosslinking via two distinct mechanisms: (i) cationic ring-opening polymerization and (ii) free radical polymerization. Monitoring of EA synthesis reactions over time using PAVs, MAAC and NV parameters, and the FT-IR method reveals that esterification reactions proceed faster at the start, exhibiting over 40% of conversion within the initial 60 min, which can be associated with a relatively high concentration of reactive sites and low viscosity of the reaction mixture at the initial reaction stage. With the further increase in the reaction time, the reaction rate tends to decrease. The control of the EA synthesis process can guide how to adjust reactions to obtain EAs with desired characteristics. Based on obtained values, one can state that the optimum synthesis time of about 4–5 h should be adopted to prepare EAs having both epoxy groups and unsaturated double bonds. The structure of the obtained EA was confirmed by FT-IR and NMR methods, as well as the determination of partial acid value and epoxy equivalent. Samples at various stages of synthesis were cured with UV radiation in order to study the kinetics of the process according to cationic and radical polymerization determined via photo-differential scanning calorimetry (photo-DSC) and real-time infrared spectroscopy (RT-IR) and then the properties of the cured coatings were tested. It turned out that the cationic polymerization was slower with a lower conversion of the photoreactive groups, as compared to the radical polymerization. All the obtained EA coatings were characterized by good properties of cured coatings and can be successfully used in the coating-forming sector.

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“…The major functions of sealant are: 1. bonding TFT and CF substrates; 2. preventing LC from pollution of external environment; 3.preventing LC leakage. All these functions can be collectively referred to sealing [2] , including interface adhesion and moisture permeability.…”

Section: Introductionmentioning

confidence: 99%

P‐51: Study on the Sealing Property of Narrow Border Display

Zhang

Zhu

Zhang

et al. 2022

Symp Digest of Tech Papers

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This paper focuses on the influence of interface adhesion and moisture permeability on the reliability of LCD products under the trend of narrow border. It is concluded that the interface polarity of the substrate and sealant should be matched to improve the adhesive force; meanwhile, the model of Reliability‐Moisture Permeability‐Sealant Width is obtained, to determine the minimum sealant width within reliability assurance.

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New UV/heat dual-curable sealant containing acrylate-epoxy hybrid resin for highly adhesive liquid crystal device

Cited by 8 publications

References 14 publications

Photocurable Epoxy Acrylate Coatings Preparation by Dual Cationic and Radical Photocrosslinking

Photocurable Epoxy Acrylate Coatings Preparation by Dual Cationic and Radical Photocrosslinking

Synthesis of Epoxy Methacrylate Resin and Coatings Preparation by Cationic and Radical Photocrosslinking

P‐51: Study on the Sealing Property of Narrow Border Display

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