Study of the chemical softness, chemical hardness, chemical stability and interaction energy of the piezoelectric compos
- PDF / 704,144 Bytes
- 10 Pages / 439.37 x 666.142 pts Page_size
- 22 Downloads / 173 Views
Study of the chemical softness, chemical hardness, chemical stability and interaction ( energy ) of the piezoelectric composite: −CH2 − CF2 − 3 ∕nHfO2 Albert Veved1 · Geh Wilson Ejuh2,3 · Noël Djongyang1 Received: 15 January 2020 / Revised: 16 June 2020 / Accepted: 17 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract ( ) This article aims to study the chemical reactivity of HfO2-doped −CH2 − CF2 − 3 (PVDF) in order to understand the aging process within it. For this purpose, properties such as chemical potential, chemical hardness and chemical flexibility and interaction energy are determined. Thus, we determined these properties for virgin PVDF, virgin H fO2 and the doped PVDF molecule. We obtain through these article relevant results. The PVDF/HfO2 molecule has a hardness greater ( 𝜂 = 2.95) than that of virgin PVDF ( 𝜂 = 1.29) and doubly or triply doped ( 𝜂 = 1.19, 𝜂 = 0.64). This result implies higher chemical stability for the PVDF/HfO2 molecule due to an interaction between a highest occupied molecular orbital (Homo) and a lowest occupied molecular orbital (Lumo) of stabilizing nature. Therefore, the PVDF/HfO2 limits the charge transfer by opposing the electronic density distribution change or a reduction in the polarizability. However, in terms of flexibility, the PVDF/2HfO2 and PVDF/3HfO2 molecules, respectively, have a sweetness s = 0.84 and s = 1.56. This sufficiently demonstrates that the PVDF/3HfO2 molecule is more flexible than the others. Finally, the advantage of this study is that we have obtained modified piezoelectric polymers which have new properties that are more valued with respect to their constituents. Our results show that doubly doped PVDF combines good flexibility and good hardness. This implies that this composite has good chemical stability compared to virgin PVDF. Therefore, the aging process is slow for this compound. In short, the doping of PVDF with HfO2 is a good alternative to remedy the loss of activity within the PVDF. Keywords Chemical hardness · Chemical softness · Stability · Doped PVDF · Lumo–homo
* Noël Djongyang [email protected] Extended author information available on the last page of the article
13
Vol.:(0123456789)
Polymer Bulletin
Introduction Piezoelectric materials that are flexible, lightweight, inexpensive, easy to process, adapt and manufacture are now the essential needs of industries developing nomadic devices [15, 39]. PVDF is one of the piezoelectric materials that meet these criteria. Energy recovery using PVDF allows the construction of environmentally friendly systems while using green energy [30]. PVDF is equally widely used today because of its resistance to creeping, superior to that of other fluorinated polymers report in the literature [19]. Indeed, electronic stability is a challenge to limit the loss of activity and slow down the aging process of these materials [25, 31], hence the current challenge of developing high performance, flexible, stable and durable polymers. Modified PVDF film with stabl
Data Loading...
