tailieunhanh - Electroactive Polymers for Robotic Applications - Kim & Tadokoro (Eds.) Part 9

Tham khảo tài liệu 'electroactive polymers for robotic applications - kim & tadokoro (eds.) part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 6 Ionic Polymer-Metal Composite as a New Actuator and Transducer Material K. J. Kim Active Materials and Processing Laboratory Mechanical Engineering Department MS 312 University of Nevada Reno Nevada 89557 . Introduction Ionic polymer-metal composites IPMCs are a unique polymer transducer that when subjected to an imposed bending stress exhibits a measurable charge across the chemically and or physically placed effective electrodes of the electroactive polymer. IPMCs are also known as bending actuators capable of large bending motion when subjected to a low applied electric field 10 kV m across the metalized or conductive surface Figure . The voltage found across the IPMC under an imposed bending stress is one to two orders of magnitude smaller than the voltage required to replicate the bending motion input into the system. This leads to the observation that the material is quite attractive by showing inclination for possible transduction as well as actuation 1-25 . In 1993 an IPMC was first reported as an active polymeric material by Oguro and his co-workers 21 . Since then much attention has been given to IPMCs with the hope that they can be used as a soft actuator and sensor transducer material for new opportunities in future engineering. IPMCs have been considered promising actuator materials in particular for biorobotic applications. Figure . Actuation of a typical IPMC from 8 Part of what makes an IPMC so unique are its inherent transductive sensing properties in addition to its actuation capabilities. Similar to piezo materials IPMCs can show displacements under an applied electric field and can also 154 K. J. Kim engender a current from an imposed bending moment that is applied to the material. The voltage can be as high as in the 10 s of millivolts range for larger imposed bending displacements. This makes IPMCs possibly effective for large motion sensor or damper applications if their behavior can be properly controlled. How IPMC .