Phase transitions in poly(vinylidene fluoride)-based composite under mechanical stresses

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Resumo

In this work the phase transition in composites based on polyvinylidene fluoride and cobalt ferrite nanoparticles under uniaxial stretching at 100, 200 and 300% is investigated. It was found that when the composite is stretched at 300%, there is a maximum increase in the β-phase fraction from 1% for the unstretched sample to 91%, while the electroactive phase increases from 74 to 92%. It was also found that tensile stretching of the composites leads to an increase in tensile strength: from 5.7 to 85.0 MPa. This tensile pattern also contributes to an increase in coercivity, which is due to the increase in the interparticle distance in the composite structure. These results emphasise the importance of mechanical properties and phase changes in polymer composites containing ferrites for their future applications.

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Sobre autores

P. Vorontsov

Kant Baltic Federal University

Autor responsável pela correspondência
Email: pavorontsov@kantiana.ru
Rússia, Kaliningrad

V. Salnikov

Kant Baltic Federal University

Email: pavorontsov@kantiana.ru
Rússia, Kaliningrad

V. Savin

Kant Baltic Federal University

Email: pavorontsov@kantiana.ru
Rússia, Kaliningrad

S. Vorontsov

Kant Baltic Federal University

Email: pavorontsov@kantiana.ru
Rússia, Kaliningrad

L. Panina

Kant Baltic Federal University; National University of Science and Technology “MISIS”

Email: pavorontsov@kantiana.ru
Rússia, Kaliningrad; Moscow

P. Ershov

Kant Baltic Federal University

Email: pavorontsov@kantiana.ru
Rússia, Kaliningrad

V. Rodionova

Kant Baltic Federal University

Email: pavorontsov@kantiana.ru
Rússia, Kaliningrad

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2. Fig. 1. X-ray diffraction pattern for CoFe2O4 nanoparticles (left) and photos of samples S0, S100, S200, S300 (right).

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3. Fig. 2. Field dependence of magnetization for CoFe2O4 and CoFe2O4@OK (left) and PVDF–CoFe2O4@OK at different degrees of stretching (right).

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4. Fig. 3. X-ray diffraction patterns (left) and IR spectra (right) for PVDF–CoFe2O4@OK composites with different degrees of stretching. X-ray diffraction pattern of unstretched PVDF–CoFe2O4@OK composite (lower graph).

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5. Fig. 4. DSC curves for composites S0, S100, S200, S300.

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6. Fig. 5. Deformation curves of composites S0, S100, S200, S300.

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