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

联合项目提案：具有铁驻极体特性的多孔含氟聚合物薄膜的开发、表征和应用子项目：多孔含氟聚合物薄膜的开发

• 批准号: 5447297
• 负责人: Professor Dr. Helmut Münstedt
• 金额: --
• 依托单位: Institut für Physik und Astronomie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5447297?language=en
• 关键词: Joint; Project; Proposal; Development; Characterization

This joint project of the Universities of Erlangen, Potsdam, Darmstadt, and Linz (the latter as a foreign partner) is concerned with the development of a new group of fluoropolymer films with cellular structure and improved thermal and temporal charge stability for electromechanical transducer applications. So far, most investigations on cellular polymer film electrets have been performed using PP. However, the thermal and temporal electret stability of PP electrets are not sufficient for most applications. Higher stabilities were found for PTFE and amorphous fluoropolymer films, but the manufacturing of these films is technically difficult and not suitable for large-scale production. In this investigation it will be attempted to adapt the proven processing of cellular polypropylene films to fluoropolymers so that the optimised void structure known from polypropylene can be combined with the superior stability of the fluoropolymers. For that aim thermoplastic fluoropolymers based an fluorinated ethylene propylene copolymers (FEP) will be used. These fluoropolymers can more easily be manufactured than PTFE, as they show a thermoplastic behaviour. The development and optimisation of suitable processes for the preparation of thin cellular films from fluoropolymers will be performed according to two routes. The one is the extrusion of films filled with inorganic fillers followed by biaxial stretching for the generation of cells preferably occurring at the particles. The other route is the preparation of foamed sheets using physical blowing agents and an in-line stretching of the foamed sheets by a Rheotens. The produced films will be analysed with respect to their cell structure. In cooperation with our project partners in Potsdam, Linz and Darmstadt their cellular structure will be optimised for different applications as electrets. Besides providing the material base for new fluoropolymer electrets this project will yield widespread results an the development of cellular fluoropolymers in general which could have an impact an other applications, too.

埃尔兰根大学、波茨坦大学、达姆施塔特大学和林茨大学（后者作为外国合作伙伴）的这个联合项目涉及开发一组具有蜂窝结构的新型含氟聚合物薄膜，并改善了用于机电换能器的热稳定性和时间电荷稳定性。到目前为止，对蜂窝聚合物薄膜驻极体的研究大多是用聚丙烯进行的，然而，聚丙烯驻极体的热稳定性和时间稳定性不足以满足大多数应用。聚四氟乙烯和非晶含氟聚合物薄膜具有较高的稳定性，但这些薄膜的制造技术困难，不适合大规模生产。在本研究中，将尝试将蜂窝聚丙烯薄膜的成熟加工方法应用于含氟聚合物，以便将聚丙烯已知的优化空隙结构与含氟聚合物的优越稳定性相结合。为此，将使用基于氟化乙烯丙烯共聚物（FEP）的热塑性含氟聚合物。这些含氟聚合物比聚四氟乙烯更容易制造，因为它们表现出热塑性行为。从含氟聚合物制备细胞薄膜的合适工艺的开发和优化将根据两种途径进行。其一是挤压充满无机填料的薄膜，然后进行双轴拉伸，以产生优选发生在颗粒处的细胞。另一种方法是使用物理发泡剂和变阻剂对泡沫板进行在线拉伸来制备泡沫板。所生产的薄膜将根据其细胞结构进行分析。通过与我们在波茨坦、林茨和达姆施塔特的项目合作伙伴的合作，我们将优化它们的蜂窝结构，以适应作为驻极体的不同应用。除了为新型含氟聚合物驻极体提供材料基础外，该项目还将产生广泛的结果，并将对蜂窝含氟聚合物的总体发展产生影响，这也可能对其他应用产生影响。