Q M Zhang-聚偏氟乙烯三氟乙烯三氟氯乙烯.pdf

Published on Web 06/07/2006 A Modular Approach to Ferroelectric Polymers with Chemically Tunable Curie Temperatures and Dielectric Constants Yingying Lu,† Jason Claude,† Bret Neese,† Qiming Zhang,†,‡,§ and Qing Wang*,†,§ Departments of Materials Science and Engineering and Electrical Engineering, Materials Research Institute, The Pennsylania State Uniersity, Uniersity Park, Pennsylania 16802 Received April 4, 2006; Revised Manuscript Received May 10, 2006; E-mail: wang@ High dielectric constant polymers are becoming crucial compo- Scheme 1 nents in advanced electronic devices, such as memory and gate dielectrics for integrated circuits, and stationary power generation, and miniature capacitors for telecommunication.1 The exchange of electrical energy and mechanical energy in sensors, transducers, and actuators also benefits from the materials with high dielectric constants.2 Compared to the traditional electroactive ceramics, polymeric dielectric materials enjoy inherent advantages, such as high mechanical elasticity, high electrical breakdown strength, ease of processing in large areas, low cost, and self-healing ability. However, unlike their inorganic counterparts, the permittivities of chemical structures on their dielectric properties. In this com- most polymers are in a limited region ranging from 2 to 12.1a munication, we describe a modular approach allowing a systematic Ferroelectric poly(vinylidene fluoride) (PVDF) and its copolymers and straightforward development of the ferroelectric fluoropolymers are the most interesting dielectric polymers du