2020
DOI: 10.1002/app.48871
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PVDF‐based composites containing PZT particles: How processing affects the final properties

Abstract: Poly(vinylidene fluoride) (PVDF)‐based composites containing up to 30 vol % of lead zirconate titanate (PZT) particles were prepared by: (a) different techniques, melt blending and solvent casting; and (b) different molding procedures, a single‐step and a two‐step hot‐pressing method. The obtained samples were characterized in order to study how the processing affects their final properties. Results indicate that the different molding processes have a strong effect on polymorphism and molecular relaxations of … Show more

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Cited by 16 publications
(17 citation statements)
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“…The dynamic-mechanical-thermal properties of the prepared membranes were also investigated to better understand the moduli temperature dependence and in order to detect the eventual presence of secondary transition phenomena [ 64 , 65 , 66 , 67 , 68 ]. Figure 5 a–c show the moduli mechanical spectra for the prepared membranes.…”
Section: Resultsmentioning
confidence: 99%
“…The dynamic-mechanical-thermal properties of the prepared membranes were also investigated to better understand the moduli temperature dependence and in order to detect the eventual presence of secondary transition phenomena [ 64 , 65 , 66 , 67 , 68 ]. Figure 5 a–c show the moduli mechanical spectra for the prepared membranes.…”
Section: Resultsmentioning
confidence: 99%
“…First of all, except for samples 1 and 2 at really low γ values, the loss modulus G” always prevails over the elastic modulus G’ in the entire strain investigation range, therefore indicating that, in agreement with theory, the un-crosslinked materials show a prevalently viscous response [ 45 ]. Moreover, by comparing the matrix viscoelastic moduli with those of the samples (i.e., the polymer matrix with the added hollow glass microspheres), it can be noted that the presence of the extenders remarkably increases the material resistance, owing to their ability to both interact with the polymer matrix and form a secondary network [ 46 ]. Additionally, the tested samples can be clearly divided into two groups depending on their rheological behavior as a function of the applied strain.…”
Section: Resultsmentioning
confidence: 99%
“…In literature there are some examples demonstrating that the intensity and the position of the PVDF transitions are influenced by sample processing 8,9,38,40 and are affected not only by the fraction of amorphous phase but also by the architecture of the crystalline phase. 36 More in general, in semi-crystalline polymers, the orientation of the crystalline lamellae induced by a given processing procedure can modify the thermal dynamic-mechanical response both below and above the glass transition.…”
Section: Dynamic-mechanical Characterizationmentioning
confidence: 99%
“…The non-polar α phase is the kinetically favored one and can be directly obtained by cooling from melt. The β phase, desirable due to its highest dipole moment, can be achieved by several methods, 4 such as mechanical stretching of the α phase, 5 rolling, 6,7 compression molding, 8,9 application of high electric fields, crystallization from polar solvents, 10 addition of nucleating fillers or blending with others polymers, 11 application of very high pressure and/or ultra-fast cooling from melt. 12,13 BaTiO 3 (BT) is a wellknown ferroelectric material which possesses excellent dielectric properties (dielectric permittivity around 1000) 14 and has been exploited for numerous applications, such as in non-volatile memories, surface acoustic wave devices, tunable capacitors and pyroelectric detectors.…”
Section: Introductionmentioning
confidence: 99%