Dielectric response and molecular dynamics of nanocomposites based on TEMPO-oxidized cellulose nanofibrils and polyvinyl acetate

被引：0

作者：

Hammami I. ^{[1
]}

Sales A.M.J. ^{[2
]}

Benhamou K. ^{[3
]}

Arous M. ^{[4
]}

Costa L.C. ^{[1
]}

da Cruz J.A. ^{[5
]}

Kaddami H. ^{[3
]}

机构：

[1] I3N and Physics Department, University of Aveiro, Aveiro

[2] Laboratório de Telecomunicações e Ciências e Engenharia de Materiais (LOCEM), Physics of Department, Federal University of Ceara, Fortaleza

[3] IMED - Lab, Faculty of Sciences and Technology of Marrakech, CADI AYYAD University, Avenue Abdelkrim Elkhattabi, B.P. 549, Marrakech

[4] LaMaCoP, Faculty of Sciences of Sfax, University of Sfax, Sfax

[5] Physics Department–State University of Maringá, PR, Maringá

来源：

Thermal Science and Engineering Progress | 2022年 / 34卷

关键词：

Dielectric properties; Nanocomposites; Polyvinyl acetate; TEMPO-oxidized cellulose nanofibrils;

D O I：

10.1016/j.tsep.2022.101428

中图分类号：

学科分类号：

摘要：

A series of polyvinyl acetate polymer matrices (PVAc) incorporated with two different TEMPO-oxidized cellulose nanofibrils (CNF with 5 min and 2 h of oxidation) were studied. These composites have proven to be suitable for use as ion battery separators. For this purpose, dielectric properties and electrical conductivity have been investigated using impedance spectroscopy in the frequency range from 102 to 106 Hz and over the temperature range, 200–350 K. The effects of CNF loading on the molecular motion and the charge transport mobility in PVAc polymer chains were studied. Calculation of the strength parameter for the α-relaxation process revealed a threshold value of 8 % in the volume fraction of filler. A comparative study of the two nanocomposites films showed that PVAc/CNF-5 min nanocomposites were able to build a denser CNF network and hence the highest potential of filling effect than those of PVAc/CNF-2 h films. According to our results, the volume fraction of 8 % of CNF-5 min is recommended for achieving the highest performing nanocomposite with potential applications. © 2022 Elsevier Ltd

引用

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