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Characterization of Properties of Poly(vinylidene Fluoride) Using Instrumented Microindentation Test
Author(s) -
dos Santos Bianca B.,
Pita Victor J. R. R.,
da Costa Marysilvia F.
Publication year - 2020
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.202000136
Subject(s) - crystallinity , materials science , indentation hardness , annealing (glass) , characterization (materials science) , amorphous solid , composite material , fluoride , fourier transform infrared spectroscopy , phase (matter) , polymer , microstructure , chemical engineering , crystallography , nanotechnology , chemistry , organic chemistry , inorganic chemistry , engineering
The microhardness evaluation of materials allows a quick prediction of their mechanical properties and the identification of morphological changes, making it an excellent tool for the characterization of parts with microstructural variations over time or that have geometric variations. In this work, instrumented microindentation test is performed on poly(vinylidene fluoride) (PVDF) specimens with different degrees of crystallinity and crystalline structures. The microstructural differences are generated by changing the cooling temperature and the annealing duration. α‐phase and β‐phase are detected by FTIR analysis in all samples, which presented the same spectra. The mathematical relation between the microhardness and the crystallinity degree of PVDF is found, and the theoretical microhardness values of the crystalline and amorphous phases are determined. Microhardness is also related to the melting temperature of the polymer, which varies as a function of crystals perfection. This relationship is expressed through a linear equation.