Improving adhesion and moisture permeability of UV/heat dual-curable adhesives using organic-inorganic hybrid resin

Hwang, Sae Hoon; Lee, Jun Hyup

doi:10.1080/15421406.2020.1741808

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…In order to improve the tensile strength and humidity resistance of the sealing materials used for LCD panels, a few researchers have used ultraviolet (UV)-curable adhesive sealants. These were synthesized using a UV-curable resin based on a commercial epoxy resin through the alkylation method [ 18 , 19 ]. Using this method, a photoinitiator is mixed with a synthesized UV-curable resin, and the resulting sealing material is solidified under UV irradiation (365 nm) using a commercial UV lamp, producing a formed sealant that exhibits high tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Using Dihydrazides as Thermal Latent Curing Agents in Epoxy-Based Sealing Materials for Liquid Crystal Displays

Lee

2020

Polymers

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In this study, highly adhesive epoxy-based sealing materials for liquid crystal (LC) displays were fabricated using different types of dihydrazides as thermal latent curing agents. Their curing characteristics, mechanical properties, LC contamination levels, and electro-optical characteristics were investigated depending on the chemical structure of dihydrazides. The epoxy-based sealing material containing a dihydrazide derivative with a bulky heterocyclic ring afforded a high heat curing conversion of 90.4%, high adhesion strength of 54.3 kgf cm−2, and a high elongation of 57.3% due to the relatively low melting characteristic under heat treatment compared to those involving dihydrazides with short aliphatic or aromatic spacers. In addition, the proposed sealing material exhibited an extremely low LC contamination level of 9 µm, which is essential to the successful operation of LC displays. With respect to electro-optical properties of the LC device, it was found that a dihydrazide derivative with a bulky heterocyclic ring afforded a normal voltage-dependent transmittance curve and fast response time due to the prevention of abnormal homogeneous LC alignment. This study developed highly adhesive and robust epoxy-based sealing materials based on the use of dihydrazides as thermal latent curing agents for advanced LC displays.

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Section: Introductionmentioning

confidence: 99%