Abstract
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.
Highlights
Of late, liquid crystal displays (LCDs) are finding wide use in various applications, including in tablets, monitors, and televisions
We compared the conversion ratios of the epoxy resin systems under the industrial curing conditions for LCDs based on the changes in the area of the C-O-C epoxide peak
The results confirmed that the used dihydrazide compounds were suitable for use as latent curing agents for LCD sealing materials
Summary
Liquid crystal displays (LCDs) are finding wide use in various applications, including in tablets, monitors, and televisions. Owing to recent developments in television manufacturing technologies, the bezel, which is the plastic part around the screen, is getting thinner because of users’ preference for larger screens For this reason, LCD sealing materials with improved properties such as higher adhesive strength, lower moisture permeability, and greater contact contamination resistance need to be developed. Researchers synthesized partially acrylated resins based on epoxy acrylate oligomers for use as dual-curing resins and investigated their mechanical properties [3]. These studies utilized specific polymers or modified epoxy resins for high adhesion properties
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