Joint Project Proposal on: Development, Characterization, and Applications of Cellular Fluoropolymer Films with Ferroelectret Properties Subproject on: Application-related Properties and Applications of Cellular Ferroelectrets

埃尔兰根大学、波茨坦大学、达姆施塔特大学和林茨大学(后者是外国合作伙伴)的这一联合项目涉及具有泡状结构的带电氟聚合物薄膜的开发、表征和应用。这种空洞结构的几何形状及其弹性性能将被设计成使薄膜最适合用作铁驻极体，即作为具有高压电系数的材料。Darmstadt子项目首先涉及蜂窝结构的优化，特别是适当的压力膨胀和装料，以获得与应用相关的良好性能。加工和测量步骤将首先在已有的泡沫聚丙烯上进行，然后在Erlangen提供的情况下尽快进行，然后再从Erlangen获得。达姆施塔特实验室的第二项任务是设计和实施一系列应用，这些材料特别适合这些应用，因为合成的设备比现有设备更简单和/或更好。其中包括具有全向和方向性的单膜和叠膜压电麦克风、超声波发射器、参数阵列和耳机。这些换能器最初将使用优化的蜂窝PP薄膜进行设计。一旦有合适的细胞氟聚合物薄膜可用，这些材料就会被整合到系统中。

This joint project of the Universities of Erlangen, Potsdam, Darmstadt, and Linz (the latter as a foreign partner) is concerned with the development, characterization and application of charged fluoropolymer films with cellular structure. The geometry of this voided structure and its elastic properties will be designed such that the films are optimal for use as ferroelectrets, i.e. as materials with high piezoelectric coefficients. The Darmstadt subproject relates first to the optimization of the cellular structure, in particular to suitable pressure expansion and charging such that good application-related properties are achieved. The processing and measuring steps will be first performed an the already available cellular polypropylene and later, as soon as available from Erlangen, an the cellular fluoropolymers. The second task of the Darmstadt Laboratory is the design and implementation of a series of applications for which these materials are particularly suited in the sense that the resultant devices are simpler and/or better than existing devices. Among these are piezoelectric microphones, both single film and stacked-film, with omnidirectional and directional charactestics, ultrasonic transmitters, parametric arrays, and headphones. These transducers will be initially designed with the optimized cellular PP films. As soon as suitable cellular fluoropolymer films are available, these will be incorporated into the systems.