抄録
In this report, at first, an ultrasonic heating method is proposed as a suitable way for an inflatable maicromanipulator made of shape memory polymer. The inflatable micromanipulator has a simple tubular body made of shape memory polymer(SMP). A manipulator joint bends with asymmetric inflation of a SMP tube caused by point heating on a tube wall and pressure loaded into the inside of the tube. Ultrasonic absorbent materials of polymer or special structures working for ultrasonic absorption are located on a wall of the SMP tube at the bending joint. Ultrasonic waves propagate from a vibrator into a liquid phase inside of the SMP tube, and the absorbent absorbs ultrasonic energy and heats up. Next, We conducted model experiments using ultrasonic waves with tens kHz order, mm sized heating targets of several polymer materials, and silicon oil as a propagation medium for investigation of characteristics of the ultrasonic heating method. From experiments it is clarified that bubbles generated by ultrasonic cavitation around a target largely effect on heating up the target. And also, the bubbles affect on thermal stability of the target. At last, we show that microballoons mixed in a target improve the thermal stability.
