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access icon openaccess Design, synthesis and processing of PVDF-based dielectric polymers

  • Author(s): Shan Wang 1  and  Qi Li 2
    • View affiliations
  • Source: Volume 1, Issue 2, July 2018, p. 80 – 91
    DOI:  10.1049/iet-nde.2018.0003 , Online ISSN 2514-3255
This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 18/01/2018, Accepted 24/04/2018, Revised 31/03/2018, Published 05/06/2018

Due to the appealing piezoelectric, pyroelectric, and ferroelectric (FE) properties, poly(vinylidene fluoride) (PVDF)-based dielectric polymers have been attracting great attention from both the academic and industrial communities. Depending on the molecular structure and the processing method, PVDF-based dielectric polymers can exhibit rich dielectric polarisation behaviours covering normal FE, relaxor FE, anti-FE-like and linear dielectric responses, which enables a wide spectrum of application fields such as non-volatile memories, piezoelectric and pyroelectric sensors, actuators, electrocaloric refrigeration, and film capacitors. In this study, the authors first briefly introduce the current practical/promising applications of PVDF-based dielectric polymers, and the corresponding optimum dielectric polarisation behaviour and crystal structure are proposed accordingly. The chemical synthesis and modification strategies for obtaining various fluoropolymers beyond PVDF homopolymer are then summarised with an emphasis on the relationship between the molecular structure and the dielectric polarisation behaviour. In addition, the effect of processing methods on the crystal structure and dielectric properties of the PVDF-based polymers is discussed. Finally, some newly developed processing techniques applicable to PVDF-based polymers are described.

Inspec keywords: dielectric polarisation; piezoelectricity; pyroelectricity; ferroelectric transitions; crystal structure; ferroelectric materials; dielectric thin films; permittivity; ferroelectric ceramics; relaxor ferroelectrics; polymer films

Other keywords: piezoelectric properties; electrocaloric refrigeration; dielectric polymers; molecular structure; ferroelectric properties; dielectric properties; anti-FE-like dielectric response; normal FE; pyroelectric sensors; relaxor FE; non-volatile memories; PVDF homopolymer; PVDF-based dielectric polymers; actuators; dielectric polarisation behaviour; film capacitors; crystal structure; chemical synthesis; poly(vinylidenefluoride)-based dielectric polymers; piezoelectric sensors; pyroelectric properties

Subjects: Structure of polymers, elastomers, and plastics; Dielectric permittivity; Preparation of organic materials, polymers and plastics; Pyroelectric and electrocaloric effects; Piezoelectricity and electrostriction; Dielectric thin films; Ferroelectric transitions and Curie point; Dielectric polarization and depolarization effects

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