Polymer(Korea), Vol.21, No.6, 991-998, November, 1997
아크릴산 그라프트 폴리에틸렌의 전기적 성질
Electrical Properties of Acrylic Acid Grafted Polyethylene
초록
아크릴산을 용융 그라프트시킨 폴리에틸렌 (PE-g-AA)의 전하분포 특성, 전기전도 특성, 수트리 특성(water treeing), 유전 특성, 그리고 교류 절연파괴강도와 같은 전기적인 성질을 조사하였다 LDPE는 이종전하가 축적되지만 PE-g-AA는 그라프트율의 증가에 따라서 이종전하의 축적으로부터 동종전하의 축적으로 변화하며 축적전하량도 감소하였다. 그라프트 반웅에 의하여 전기전도기구의 변화는 없으며, 그라프트율에 따라서 전류밀도와 전하이동도가 감소하였다. 그리고, 아크릴산의 그라프트율이 증가함에 따라서 수트리 특성과 절연파괴강도도 증가하였다. PE-g-AA의 전기적 성질의 변화는 폴리에틸렌내에 도입되어 트랩위치로 작용하여 주입되는 전하를 증가시키는 카보닐기가 중요한 역할을 하는 것으로 여겨진다.
Electrical properties such as space charge accumulation, conduction characteristics, dielectric breakdown and water treeing of acrylic acid-grafted polyethylene (PE-g-AA) were investigated. In PE-g-AA, heterocharge found in LDPE decreased with the increase of AA graft ratio and changed to the homocharge formation above 0.1 wt% due to the introduction of carbonyls. Conduction currents and charge mobilities of PE-g-AAs decreased with the increase of AA graft ratio, while conduction mechanism remains unchanged. AC breakdown strength increased and water treeing length decreased with the increase of graft ratio in PE-g-AA. Carbonyls acting as trap sites and sources of charge injection may play an important role in the determination of electrical properties of grafted polyethlene.
Keywords:Polyethylene;Grafting;Space Charge;Electrical Conduction;Water Treeing;AC Breakdown Strength
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