Mechanical properties of the epoxy siloxane hybrid materials with different siloxane network

Abstract

In the past, Although flat and hard to change, flat-panel displays which are easy to mass-produce and strong mechanical strengths have dominated most mobile devices market However, With increasing interest in the portability and comfort of mobile devices, interest and research on flexible displays is increasing. In order to actualize a flexible device, the battery, the substrate, and the components constituting the display must not be broken even if they are bent. Therefore, studies for making such components with materials having a certain degree of bending property without using a conventional hard and cracked glass-like material are actively conducted. Organic materials are the most actively studied materials for the fabrication of flexible displays. These materials have good impact resistance and can withstand warpage, so they can be fully compatible with flexible displays. However, due to its low heat resistance and scratch resistance, it can consist of flexible devices. However, due to its low heat resistance and scratch resistance, it is not compatible with various processes and is difficult to commercialize. In order to make up for this, and to obtain the advantages of both materials, many organic-inorganic hybrid materials in which an organic structure and an inorganic structure exist together are being actively researched.

In this study, oligosiloxane having various siloxane bond structures with epoxy functional groups was prepared by sol - gel process and hydrogen silylation reaction, and cationic polymerization reaction was performed to produce epoxy organic - inorganic hybrid material. Epoxy resins with various siloxane bonding structures were synthesized and their mechanical properties were compared to find an oligosiloxane structure suitable for the most flexible displays. oligosiloxane having a random structure, oligosiloxane having a square structure, oligosiloxane having a three-dimensional ordered ladder shape, and oligosiloxane having a three-dimensional cube shape were prepared and compared with each other.

It was confirmed that the oligosiloxane having a three - dimensional ordered structure had higher mechanical strength and scratch resistance than the random structure. Compared with the square structure, the three-dimensionally arranged ladder structure also showed high mechanical strength and scratch resistance, but it was confirmed that the two-dimensionally arranged structure was further stretched with respect to external tensile and bending deformation by tensile test and in-situ bending test.