The most widely used material for active transducer applications is
the ferroelectric ceramic PZT. Composites made of ferroelectric ceramics
combined with polymers have several advantages over pure ceramics. Diphasic
composites of PZT (and La/Ca modified PZT) combined with various polymers such
as PVDF, PVC, PVA, epoxy resin and co-polymers have been widely studied and
reported in the literature.
In this paper we present the preparation and study of PZT-PVDF composites of
0-3 connectivity. The composites are prepared by two methods, namely (i) the
solvent-cast method and (ii) the hot-press method. The piezoelectric strain
coefficient (d33) is studied as a function of volume fraction of PZT in
PVDF. The dielectric constant (k) is measured as a function of temperature
and the piezoelectric voltage coefficient (g33) of the composite is
determined.
The experimental values of the dielectric constant, d33 and g33 of
the composites are compared with the earlier reported values and the
theoretical values proposed by Furukawa et al (Furukawa T, Ishida K and
Fukada E 1979 J. Appl. Sci. 50 4904) and Bhimasankaram et al
(Bhimasankaram T, Suryanarayana S V and Prasad G P 1998 Curr. Sci. 4 967).
The composite with 0.5 PZT volume fraction prepared by the hot-press method is
found to possess a reasonably high d33 value and exhibit good flexibility
and stability with time.
Introduction: Recent advances in the field of material sciences have opened up a new horizon of options for bonding agents that can be used efficiently in orthodontics. The purpose of this study was evaluate and compare the shear bond strength (SBS) of the traditionally used Transbond XT and a newer nano-filled material Prime and Bond NT.
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