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고전압 전력케이블 절연체 응용을 위한 임팩트 폴리프로필렌 기반 3성분계 블렌드의 기계적 및 전기적 특성에 대한 연구
이성환,김도균,홍신기,한진아,한세원,이대호,유승건,Lee, Seong Hwan,Kim, Do-Kyun,Hong, Shin-Ki,Han, Jin Ah,Han, Se Won,Lee, Dae Ho,Yu, Seunggun 한국복합재료학회 2022 Composites research Vol.35 No.3
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 100℃ 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.
배한결(Hankyul Bae),우준규(Jungyu Woo),유승건(Seunggun Yu),최준형(Junhyeong Choi),현영서(Youngseo Hyeon) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6
Recent progress in the vehicle industry has been about making suspension systems lighter and more durable. These systems are key for keeping cars stable and comfortable to drive. However, parts of the suspension, like the lower arm, can often have issues with too much stress. This paper talks about how to deal with these stress problems in the lower arm, aiming to make it last longer. By looking at how much stress happens when changing lanes or braking, we try to figure out how it affects the suspension. Using Taguchi method, we look for the best shape for the lower arm that lowers stress and makes it last longer. Our results show that the best shape for the lower arm can greatly reduce stress and increase its life, while also cutting its weight by about 60%. This study helps a lot in making cars lighter and more durable by finding the best shape for the lower arm.