Effect of accelerated thermal aging on mechanical, electrical properties and long-term life time of EEA/LDPE/CNT composite
- 주제(키워드) composite , polymer , thermal aging
- 발행기관 고려대학교 대학원
- 지도교수 윤호규
- 발행년도 2018
- 학위수여년월 2018. 2
- 학위구분 석사
- 학과 대학원 신소재공학과
- 원문페이지 75 p
- 실제URI http://www.dcollection.net/handler/korea/000000079562
- 본문언어 영어
- 제출원본 000045932380
초록/요약
In this study, the effect of accelerated thermal aging time on mechanical and electrical properties of low density poly ethylene (LDPE) /poly(ethylene-co-ethyl acrylate) (EEA) composites filled with multi-walled carbon nanotubes (MWCNT) used for semi-conductive layer in power cable were studied. The accelerated thermal aging tests were conducted under continuous stress conditions of 140 °C using samples of compounded EEA, EEA / LDPE composites. As the thermal cycle increased, the tensile strength and elongation of EEA/LDPE composites were continually decreased. The volume resistivity also decreased with increasing thermal aging time due to chain scission and the decrease of chain mobility by thermal oxidation. The prediction of long-term life time of EEA/LDPE composites was calculated by Arrhenius model. In addition, the life time equation of EEA/LDPE composite was suggested in order to estimate the failure time at various operating temperature. In addition, the degradation mechanism and the respective composites were compared using spectral characteristics.
more목차
Contents
ABSTRACT i
LIST OF TABLES iv
LIST OF FIGURES iv
1. INTRODUCTION 1
2. EXPERIMENTAL
2-1. Raw Materials 5
2-2. Sample preparation 7
2-3. Measurement
2-3-1. Mechnical properties 13
2-3-2. Electrical properties 14
2-3-3. Thermal properties 16
2-3-4. Spectroscopy 17
3. RESULTS AND DISCUSSION
3-1. Mechnical properties 18
3-2. Electrical properties 27
3-3. XRD analysis 30
3-4. FT-IR analysis 33
3-5. XPS analysis 37
3-6 Thermal properties 37
3-7 Accelerated life test (ALT) 37
4. CONCLUSIONS 41
REFERENCES 42
