Epoxy-siloxane molecular hybrid materials for application of flexible hard coatings플렉시블 하드코팅 응용을 위한 에폭시-실록산 분자하이브리드 재료

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A glass has played a key role providing good transparency and reliable protection of a screen for most flat-panel displays. However, the transition toward the era of flexible electronics make the glass an impractical option as a cover window due to its intrinsic stiffness and brittleness. Recently, hardware innovation for commercialization of foldable displays have focused on the development of new optically transparent protective materials as a substitute of the glass, simultaneously attaining high strength and elastic compliance known to be mutually exclusive. In this dissertation, research for the design of innovative transparent hybrid material, exhibiting glass-like wear resistance, plastic-like compliance and large elastic recoverability resulted from the strategy to increase the chemical bonds of intra- and inter-phases at the molecular level, is conducted as follows. First, the synthetic mechanism of epoxy siloxane molecular hybrid (ESMH) are developed using a simple, mass-producible and low-energy-consuming method based on the synergetic combination of highly condensed siloxane backbones by the sol-gel reactions that are maximally cross-linked by a cationic ring-opening polymerization of cycloaliphatic epoxide groups. In addition, by introducing the moisture annealing process, the epoxy conversion increased and the volume expansion occurred which resulted in the relaxation of residual stresses due to the volume shrinkage by the epoxy linking. Second, the mechanical properties are characterized using nanoindentation experiments and in-situ compression and bending tests to visually and quantitatively validate the real mechanical responses under the same mode it will encounter during the actual applications, which shows that the ESMH pierces the limitation of mechanical properties for engineering materials. Lastly, on the basis of structure-property relationships in epoxy-siloxane hybridization, we propose that these brilliant properties to intimate chemical bonds of intra- and inter-phases at the molecular level. These findings create a new selection to be applied for flexible protective coatings in flexible cover windows.
Advisors
Bae, Byeong-Sooresearcher배병수researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2018.2,[viii, 89 p. :]

Keywords

epoxy-siloxane hybrids▼aflexible hard coatings▼aglass-like wear resistance▼aplastic-like compliance▼aresilient coatings; 에폭시-실록산 하이브리드▼a플렉시블 하드코팅▼a유리 수준의 내마모성▼a플라스틱 수준의 유연성▼a탄성 코팅

URI
http://hdl.handle.net/10203/264993
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734362&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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