The role of high pressure in the study and applications of the ferroelectric polymer polyvinylidene fluoride and its copolymers
- Sandia National Labs., Albuquerque, NM (United States)
- Institut Franco-Allemand de Recherches de Saint-Louis, 68 (France)
Effects of frequency, temperature and hydrostatic pressure on dielectric properties, molecular relaxations, and phase transitions of PVDF and a copolymer with 30 mol % trifluoroethylene are discussed. Pressure causes large slowing down of the {beta} molecular relaxations as well as large increases in the, ferroelectric transition temperatures and melting points, but the magnitudes of the effects are different for the different transitions. These effects can be understood in terms of pressure-induced hindrance of the molecular motions and/or reorientations. A unique application of these polymers as time-resolved dynamic stress gauges based on PVDF studies under very high pressure shock compression is discussed.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 10169657
- Report Number(s):
- SAND--94-1926C; CONF-9407105--1; ON: DE94015742; BR: GB0103012
- Country of Publication:
- United States
- Language:
- English
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