Influence of mechanical activation on mechanical properties of PVDF-nanoparticle composites

Mechanical activation leads to the creation of new surfaces and decrease in particle size of the initial powder particles, which affects the crystallization of PVDF matrix.  In addition, prolonged mechanical activation leads to agglomeration of nanoparticles agglomerates of different sizes. 
Microstructural changes due to mechanical activation in ZnO, BaTiO3, SrTiO3 and TiO2 powders were investigated using electron microscopy (TEM and SEM), x-ray diffraction (XRD) and particle size analysis (PSA). These were correlated with molecular simulations of mechanical properties of PVDF-nanocluster composites with different oxide nanocluster sizes (1, 1.5 and 2 nm) 
Each system was simulated using a periodic system of metal oxide nanocrystal inside β-PVDF matrix. β-PVDF was chosen for its superior properties over α- and γ- phases. Geometry of each system was optimized prior to the calculation of mechanical properties using GULP v4.3 software package. 
Molecular simulations show that, in general, mechanical properties (Young modulus as an indication of elasticity, Shear modulus as an indication of hardness) for all systems improve with decrease in nanocluster size. This suggests that mechanical activation of fillers in PVDF-metal oxide nanoparticle composites should have a positive effect on the mechanical properties of composite systems. 
This suggests mechanical activation as an easy an inexpensive method of improving mechanical properties of polymer-nanocrystal composite materials. 

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Author:Jelena Živojinović, Adriana Peleš, Vladimir Blagojević, Darko Kosanović, Vladimir B. Pavlović
Document Type:Conference Proceeding
Date of Publication (online):17.11.2016
Year of first Publication:2016
Tag:PVDF; composite materials; mechanical activation; nanoparticles
Poster presented at the V Advanced Ceramics and Application Conference
Belgrade, 21-23 September 2016.
Institutes:Institute of Technical Sciences of the Serbian Academy of Sciences and Arts
open_access (DINI-Set):
MESTD Projects 2011-2017:OI 172046 - Electrochemical synthesis and characterization of nanostructured functional materials for new technology applications
Licence (English):License LogoCreative Commons - Attribution-Noncommercial-No Derivative Works 3.0 Serbia