Novel heat durable electromechanical film: processing for electromechanical and electret applications
Novel heat durable electromechanical film: processing for electromechanical and electret applications
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DOI：
10.1109/tdei.2006.247820
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发表时间：
2006-10
影响因子：
3.1
通讯作者：
E. Saarimaki;M. Paajanen;A. Savijarvi;H. Minkkinen;M. Wegener;O. Voronina;R. Schulze;W. Wirges
中科院分区：
文献类型：
--
作者：
E. Saarimaki;M. Paajanen;A. Savijarvi;H. Minkkinen;M. Wegener;O. Voronina;R. Schulze;W. Wirges
基于环烯烃聚合物和共聚物的泡沫，开发了新型铁电驻极体。在环烯烃聚合物泡沫上获得的结果表明铁电驻极体换能器材料的使用温度显著提高。合适的配混和制备导致具有约15 pC/N的机电活性的环烯烃铁电驻极体，其在至少高达110 degC下是热稳定的。传感器和致动器应用中的性能强烈地依赖于与薄膜制造、传感器和致动器制备、气体含量和充电相关的工艺参数。与早期开发的聚丙烯铁电驻极体相比，膜拉伸的加工窗口非常窄。通过气体扩散膨胀来调节膜的孔隙率、柔软度以及因此的机电活性。机电操作的传感器和致动器的活性通过堆叠几层蜂窝状环烯烃膜来增加。对于平板扬声器等应用，通过将泡沫膜张紧在支撑框架上来调谐泡沫膜。正确的张紧对于降低变形水平也是必不可少的
New ferroelectrets were developed on the basis of foams from cyclo-olefin polymers and copolymers. The results obtained on the cyclo-olefin polymer foam demonstrate a significant improvement of the service temperature for ferroelectret transducer materials. Suitable compounding and preparation led to cyclo-olefin ferroelectrets with an electromechanical activity of around 15 pC/N, which is thermally stable at least up to 110degC. The properties in sensor and actuator applications are strongly dependent on the processing parameters related to film-making, sensor and actuator preparation, gas content and electric charging. The processing window for the film stretching was very narrow compared to the earlier developed polypropylene ferroelectrets. The film porosity, softness and thus the electromechanical activity are adjusted by gas-diffusion expansion. The activity of the electromechanically operating sensors and actuators was increased by stacking several layers of cellular cyclo-olefin film. For applications such as flat loudspeakers, the foamed films are tuned by tensioning them on a support frame. Correct tensioning was essential also for reducing the distortion levels