고전압 전력케이블 절연체 응용을 위한 임팩트 폴리프로필렌 기반 3성분계 블렌드의 기계적 및 전기적 특성에 대한 연구
Mechanical and Electrical Properties of Impact Polypropylene Ternary Blends for High-Voltage Power Cable Insulation Applications
2
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
폴리프로필렌은 가교폴리에틸렌을 대체할 수 있는 차세대 고전압 전력케이블 절연체로써 큰 주목을 받고 있다. 하지만, 폴리프로필렌은 탄성률이 크고 충격에 취약하여 단독으로 절연체로 사용될 수 없고, 중합 단계에서 고무상이 혼재된 공중합체 형태로 주로 활용된다. 본 논문에서는 내충격성 폴리프로필렌, 폴리올레핀 탄성체, 그리고 프로필렌-에틸렌 랜덤공중합체의 용융 혼합을 통해 연성의 폴리프로필렌계 블렌드를 제조하였다. 폴리프로필렌 기재를 유지하면서도 다량의 탄성체 상들을 지니는 적정 비율의 3성분계 블렌드를 개발하였고, 탄성체 상들의 도입에 의해 폴리프로필렌의 탄성률을 감소시킬 수 있을 뿐만 아니라, 25도 및 -40도에서의 충격강도 및 연신율을 크게 증가시킬 수 있었다. 또한, 동적기계분석을 통해 가교폴리에틸렌이 기계적 물성을 손실하는 100도 이상의 온도에서도 3성분계 블렌드는 고체 형태를 유지할 수 있는 범위의 저장탄성률을 나타내었다. 뿐만 아니라, 3성분계 블렌드는 30 kV/mm의 직류 전압 인가 하에서 공간전하를 효과적으로 억제시키는데 유리한 것으로 나타났다.
Abstract
Polypropylene (PP) has been received great attention as a next-generation high-voltage power cable insulation material that can replace cross-linked polyethylene (XLPE). However, the PP cannot be used alone as an insulation material because of its high elastic modulus and vulnerability to impact, and thus is mainly utilized as a form of a copolymer with rubber phases included in the polymerization step. In this paper, a soft PP-based blend was prepared through melt-mixing of impact PP, polyolefin elastomer, and propylene-ethylene random copolymer. The elastic modulus and impact strength of the blend could properly be decreased or increased, respectively, by introducing elastomeric phases. Furthermore, the blends showed a high storage modulus even at a temperature of 100ºC or higher at which the XLPE loses its mechanical properties. In addition, the blend was found to be effective in suppressing the space charge compared to the pristine PP as well as XLPE.
참고문헌 (23)
- Hertem, D. V., "Multi-terminal VSC HVDC for the European Supergrid : Obstacles", Renewable and Sustainable Energy Reviews, 14, pp.3156~3163 (2010)
- Pierri, E., "Challenges and Opportunities for a European HVDC Grid", Renewable and Sustainable Energy Reviews, 70, pp.427~456 (2017)
- Itiki, R., "Technical Feasibility of Japan-Taiwan-Philippines HVdc Interconnector to the Asia Pacific Super Grid", Renewable and Sustainable Energy Reviews, 133, pp.110161~ (2020)
- Pourrahimi, A. M., "Repurposing Poly(3-hexylthiophene)as a Conductivity-reducing Additive for Polyethylene-based High-voltage Insulation", Advanced Materials, 33, pp.2100714~ (2021)
- Long, W., "HVDC Transmission : Yesterday and Today", IEEE Power and Energy Magazine, 5, pp.22~31 (2007)
- Ouyang, Y., "Highly Insulating Thermoplastic Blends Comprising a Styrenic Copolymer for Direct-current Power Cable Insulation", High Voltage, 7, pp.251~259 (2022)
- Mauri, M., "Click Chemistry-type Crosslinking of a Low-conductivity Polyethylene Copolymer Ternary Blend for Power Cable Insulation", Polymer International, 69, pp.404~412 (2020)
- Vahedy, V., "Polymer Insulated High Voltage Cables", IEEE Electrical Insulation Magazine, 22, pp.13~18 (2006)
- Su, Y., "Evaluation of Voltage Endurance Characteristics for New and Aged XLPE Cable Insulation by Electrical Treeing Test", IEEE Transactions on Dielectrics and Electrical Insulation, 26, pp.72~80 (2019)
- Meng, P., "Comparisons of Different Polypropylene Copolymers as Potential Recyclable HVDC Cable Insulation Materials", IEEE Transactions on Dielectrics and Electrical Insulation, 26, pp.674~680 (2019)
- Yu, S., "Thermal Conduction Behaviors of Chemically Cross-linked High-density Polyethylenes", Thermochimica Acta, 583, pp.67~71 (2014)
- Jha, J. -W., "Morphology and Crystalline-phase-dependent Electrical Insulating Properties in Tailored Polypropylene for HVDC Cables", Applied Physics Letters, 109, pp.222902~ (2016)
- Yu, S., "Insulative Ethylene-propylene Copolymer-nanostructured Polypropylene for High-voltage Cable Insulation Applications", Polymer, 202, pp.122674~ (2020)
- 이동우, "폴리프로필렌 기반 자기강화 복합재료의 기계적물성 및 난연성 연구", Composites Research, 30(3), pp.223~228 (2017), 한국복합재료학회
- Adnan, M., "Polypropylene-based Nanocomposites for HVDC Cable Insulation", IET Nanodielectrics, 4, pp.84~97 (2021)
- Hong, S. -K., "Polypropylene-based Soft Ternary Blends for Power Cable Insulation at Low-to-high Temperature", Journal of Applied Polymer Science, 139, pp.51619~ (2022)
- 이세민, "고 변형률 속도에서 폴리프로필렌 및 열가소성 올레핀 소재의 압축 거동에 대한 연구", Composites Research, 35(1), pp.38~41 (2022), 한국복합재료학회[DOI]
- Pires, M., "Structural Characterization of Reactor Blends of Polypropylene and Ethylenepropylene Rubber", Journal of Applied Polymer Science, 92, pp.2155~2162 (2004)
- Belli, S., "P-lase: Breakthrough in Power Cable Systems", 2010 IEEE International Symposium on Electrical Insulation, pp.1~5 (2010)
- Zhang, L., "Enhancement of Lowtemperature Brittleness of Isotactic Polypropylene Filled with Thermoplastic Elastomer for HVDC Cables", 2021 Electrical Insulation Conference (EIC), pp.301~304 (2021)
- Wal, A., "Fracture of Polypropylene : The Effect of Crystallinity", Polymer, 39, pp.5477~5481 (1998)
- Huang, X., "Material Progress Toward Recyclable Insulation of Power Cables Part 2 : Polypropylene-based Thermoplastic Materials", IEEE Electrical Insulation Magazine, 36, pp.8~18 (2020)
- Premphet, K., "Phase Structure of Ternary Polypropylene", elastomer, Polymer, pp.2000, 41[DOI]