经二次膨化工艺优化的孔洞结构聚丙烯薄膜的压电性  

Piezoelectric activitiy of cellular polypropylene films after a double-expansion process

作　　者：张晓青[1] 黄金峰[1] 王飞鹏[1] 夏钟福[1] 

机构地区：[1]同济大学物理系波耳固体物理研究所,上海200092

出　　处：《功能材料与器件学报》2007年第6期537-542,共6页Journal of Functional Materials and Devices

基　　金：国家自然科学基金项目(No.50503018);上海市自然科学基金项目(No.05ZR14125);教育部留学回国人员科研启动基金(项目名称:孔洞结构铁电驻极体薄膜压电性和储电性研究)资助

摘　　要：报道了提高孔洞结构压电驻极体膜压电活性的新方法。该方法是在对已膨化处理的压电驻极体薄膜再进行一次膨化处理,通过调节薄膜的力学性能来进一步优化材料的压电活性。结果表明,将聚丙烯(PP)压电驻极体薄膜进行二次膨化处理后,其压电活性比一次膨化的PP薄膜提高约40%。这是因为薄膜在真空蒸镀电极过程中导致的厚度减小能够通过二次膨化工艺得到恢复,而厚度的增加可以有效地降低材料的杨氏模量,从而使薄膜的压电系数d_(33)增加;两次膨化温度对压电系数d_(33)均有影响,并且相互联系;通过选择合理的一次和二次膨化工艺参数(例如100℃和45℃)能够获得稳定的高压电系数压电驻极体膜。Expaned cellular piezoelectret film, which was fabricated by pressed gas prior to charging, shows a high piezoelectric d33 - coefficient. In this paper, a new method for further improving of d33 for such film is reported. By means of a second pressure expansion post charging and metallization, the piezoelectric activity can be further enhanced by more than 40 percent in comparison with samples subjected to only a single expansion. The thickness change by the second expansion causes a decrease of Young＇s modulus and results in the increase of d33. The combination of the temperatures prior to and post charging and metallization is crucial for obtaining high and stabile d33 -coefficient.

关 键 词：二次膨化 孔洞结构聚合物 压电性 驻极体 

分 类 号：R318.08[医药卫生—生物医学工程]