화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.26, No.1, 113-120, January, 2002
Export Citation
유전성 탄성체를 이용한 전기변형 고분자 구동체의 특성 연구
A Study of Electrostrictive Polymer(EP) Actuator Using Dielectric Elastomers
황성덕, 이경섭, 김홍경1, 최혁렬2, 김훈모2, 전재욱3, 이영관4, 남재도†
  • 성균관대학교 고분자공학과
  • 1고분자기술연구소
  • 2성균관대학교 기계공학과
  • 3성균관대학교 전기전자컴퓨터공학과
  • 4성균관대학교 화학공학과
Sungdoc Hwang, Kyungsub Lee, Hongkyeong Kim1, Hyoukryeol Choi2, Hunmo Kim2, Jae Wook Jeon3, Young Kwan Lee4, and Jae-Do Nam†
  • Department of Polymer Science and Engineering, Sung Kyun Kwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyunggi-do 440-746, Korea
  • 1Polymer Techology Institute, Sung Kyun Kwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyunggi-do 440-746, Korea
  • 2Department Mechanical Engineering, Sung Kyun Kwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyunggi-do 440-746, Korea
  • 3School of Electrical and Computer Engineering, Sung Kyun Kwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyunggi-do 440-746, Korea
  • 4Department Chemical Engineering, Sung Kyun Kwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyunggi-do 440-746, Korea
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초록
전기변형(electrostriction)이란 물체에 전압을 인가했을 때 맥스웰 응력이 나타나고, 이로 인하여 물체가 변형되는 현상을 말한다. 이러한 성질은 대부분의 유전체에서 나타나는데, 특히 탄성계수가 낮은 엘라스토머에 적용하면 전기에너지가 효율적으로 변환되어 큰 변형과 힘을 발현한다. 이렇게 전기변형을 크게 일으키는 고분자를 전기변형 고분자(electrostrictive polymer, EP)로 분류하며, 이들은 구동체 및 센서, 인공근육, 음향전달 장치 분야로의 활용이 유망한 재료로 예견되고 있다. 본 연구에서는 폴리우레탄과 아크릴 고무 등의 유전성 탄성체(dielectric elastomer)를 이용하여 전극-EP-전극의 적층을 이루는 유니모프 구동체를 제조하여 구동시켰고 주파수를 증가시키면서 작동시킬 때 구동체의 운동범위가 감소하는 현상을 전기적, 기계적으로 해석하고자 유전율과 탄성율을 주파수에 따라 측정하는 한편, 고전적 적층이론을 이용하여 EP의 구동역학을 모델링 하였다. 실험결과, 주파수 증가에 따른 구동체의 운동 변위 감소는 재료의 유전 완화시간과 밀접한 관계를 가졌음을 알 수 있었고, 고전적 적층이론으로 해석한 유니모프 구동체의 운동은 실제 적용한 우레탄 구동체의 운동과 상당히 유사한 거동을 보였다.
Electrostriction is the phenomenon that a material is strained due to Maxwell stress developed by the applied voltage. In many electrostrictive materials, especially polymeric elastomers can produce large deformation and force due to their low elastic modulus. In this study, polyurethanes and acrylic rubber with compliant electrodes were used as electrostrictive polymer(EP) actuator. Actuation characteristics of the EP actuators with different physical properties of dynamic modulus and dynamic dielectiric constant were analyzed under AC field. The classical laminate theory was also used to simulate the actuation process in relation to the geometry and the physical properties of the actuators.
Keywords:electrostrictive polymer;dielectric elastomer;unimorph actuator;dielectric constant;classical laminate theory
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