摘要
电极化的孔洞结构聚合物薄膜同时具有铁电材料(极化弛豫以及与极化相耦合的其它物理量的弛豫)和驻极体(存在过剩电荷)的特点,被命名为铁电驻极体(ferroelectret),是一类新型的机电传感器材料.这种材料的压电活性源于沉积在内部孔洞上下两壁极性相反的空间电荷和材料的孔洞结构.它除具有与压电陶瓷相当,甚至更高的压电d33系数(准静态d33高达1400pC/N,比铁电聚合物PVDF及其共聚物P(VDF/TrFE)的d33高出近二个量级)以外,还拥有聚合物的柔顺性、可大面积成膜、低成本、低电容率以及与空气和水相匹配的低声阻抗等突出特性.可以说,这种新型压电材料组合了压电陶瓷和铁电聚合物的各自优势,必将在通讯、保安、控制、医疗及军事等领域有广阔的应用前景.作者综述电极化孔洞结构聚合物薄膜的制备方法,电极化工艺,压电性,理论模型,应用前景,发展现状及其展望.
After proper electric charging, polymer foams show the behavior similar to ferroelectric material. Since the charged polymer foams combine the characteristics of ferroelectrics (hysteresis loop) and electrets (surplus charges), they are named ferroelectrets. This is a new type of piezoelectric materials. This paper introduces the microstructure and preparation of such ferroelectret, as well as its ferro-and piezoelectric properties, model, applications, status in quo and outlook.
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第S1期29-34,共6页
Journal of Sichuan University(Natural Science Edition)
基金
德国DFG和德国大众汽车基金
关键词
铁电驻极体
孔洞结构聚合物
压电性
储电性
薄膜
ferroelectret
piezoelectricity
ferroelectrics
electret
cellular structure
