Bentonite as an active natural filler for silicone leading to piezoelectric-like response material
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comunitat-uji-handle2:10234/7035
comunitat-uji-handle3:10234/8617
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Title
Bentonite as an active natural filler for silicone leading to piezoelectric-like response materialAuthor (s)
Date
2022-01-10Publisher
ElsevierISSN
2238-7854Bibliographic citation
IACOB, Mihail, et al. Bentonite as an active natural filler for silicone leading to piezoelectric-like response material. Journal of Materials Research and Technology, 2021.Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
Raw sodium bentonite (Bent) without preliminary treatments is incorporated as a filler in a
silicone matrix, from 5 to 100 parts per hundred (pph), by weight, by simple mixing in
solution. The mixtures are processed ... [+]
Raw sodium bentonite (Bent) without preliminary treatments is incorporated as a filler in a
silicone matrix, from 5 to 100 parts per hundred (pph), by weight, by simple mixing in
solution. The mixtures are processed as films and stabilized by condensation crosslinking
at room temperature. Besides being environmentally safe and non-toxic, bentonite is 30
times cheaper than polydimethylsiloxane (PDMS), so the cost price of composites can be
reduced by over 40%. Studies on the effects of bentonite addition as filler on the properties
of composites reveal that thermal stability is not significantly affected, while an increase in
the amount of inorganic residue with an increase of Bent content is recorded. More
importantly, the mechanical and dielectric properties are significantly influenced by the
Bent content in the PDMS matrix. The Young's modulus increases, while the elongation
decreases, indicating a stiffening of the material and a decrease in its elasticity as the Bent
load increases. Most notably, the dielectric permittivity increases up to more than five
times at 103 Hz by adding 100 pph Bent, while the dielectric losses remain acceptable,
especially at high frequencies for all composites. Furthermore, the study of composite films
through Piezoresponse Force Microscopy and piezoelectric testing system reveals an
outstanding piezoelectric-like response for composites with a high Bent content. The wideangle X-ray diffraction indicates an increase of the crystalline fraction - the main factor
that influences the apparent piezoelectric coefficient - with increasing the Bent load [-]
Is part of
Journal of Materials Research and Technology. Volume 17, March–April 2022, Pages 79-94Funder Name
Romanian Ministry of Research, Innovation and Digitization
Project code
CNCS/CCCDIUEFISCDI | PN-III-P2-2.1-PED-2019-3652
Rights
info:eu-repo/semantics/openAccess
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