Wettability of Epoxy-based Composites with Silanized Silica Microparticles
- 주제(키워드) Wettability , Epoxy , Silica , Silane coupling
- 발행기관 고려대학교 대학원
- 지도교수 윤호규
- 발행년도 2017
- 학위수여년월 2017. 2
- 학위구분 석사
- 학과 대학원 신소재공학과
- 원문페이지 56 p
- 실제URI http://www.dcollection.net/handler/korea/000000072580
- 본문언어 영어
- 제출원본 000045897477
초록/요약
Cycloaliphatic epoxy has been used as outdoor insulation material for high voltage to maintain good electrical performance and resistance to ultraviolet light. However, polluted atmosphere such as fine dust, acid rain collecting on insulator surfaces leads to surface abrasion, eventually destroying the insulator. Therefore, weather resistant properties are necessary. In this study, a series of microcomposites comprising of cycloaliphatic epoxy resin and modified microsilica fillers surface passivated with organosilane coupling agents were fabricated. Three different silanes, methyltrimethoxysilane(MTMS), glycidoxypropyltrimethoxysilane(GPS), and tridecafluoro-1,1,2,2-tetrahydrooctyl trimethoxysilane(FTEOS) were used and the amount of silane coupling agent were optimized for surface treatment of silica microparticles. The surface passivated silica particles were characterized by solid state 29Si NMR and XPS analysis. In rheological analysis, the value of complex viscosity was high in order of pre-cured mixture, FTEOS silianized silica mixture was higher than others. Mechanical properties were analyzed by flexural strength and SEM. Wettability of each specimen was measured using contact angle analysis. The neat epoxy’s contact angle was measured 101.4°, and those others composite’s contact angle increased with increase in filler contents. The FTEOS treated silica / epoxy composites exhibited higher contact angle (117.1°). Additionally, we treated O2 plasma etching in order to increase the surface roughness. As a result, prototype outdoor insulator maintains hydrophobicity and weather resistant property by salt spray test.
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Contents
ABSTRACT i
LIST OF TABLES v
LIST OF FIGURES v
1. INTRODUCTION 1
1-1. Contact angle 3
1-2. Surface free energy 7
2. EXPERIMENTAL 13
2-1. Materials 13
2-2. Sample preparation 14
2-2-1. Silanization of silica particles 14
2-2-2. Preparation of composites 14
2-3. Measurement 16
3. RESULTS AND DISCUSSION 18
3-1. NMR 18
3-2. XPS 21
3-3. Rheology 24
3-4. Mechanical strength 28
3-6. Morphology 32
3-7. Wettability 35
3-8. Plasma etching 40
3-9. Application 43
4. CONCLUSIONS 45
REFERENCES 46
