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  4. Surface modified microfibrillated cellulose‐poly(vinylidene fluoride) composites: β‐phase formation, viscoelastic and dielectric performance
 
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research article

Surface modified microfibrillated cellulose‐poly(vinylidene fluoride) composites: β‐phase formation, viscoelastic and dielectric performance

Poothanari, Mohammed Arif  
•
Michaud, Véronique  
•
Damjanovic, Dragan  
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2021
Polymer International

The effect of silylation of microfibrillated cellulose (MFC) surfaces on β‐phase formation in poly(vinylidene difluoride) (PVDF) and the resulting viscoelastic and dielectric performance of MFC‐PVDF composites is investigated. Two different organosilanes, namely aminated (A) and fluorinated (F), were used. Composites of PVDF and MFC at concentrations up to 10 wt%, both untreated and silylated, were prepared by solvent casting. The two different surface modifications did not markedly change the melting and crystallization enthalpy of the polymer. However, only A‐MFC was found to promote β‐phase compared to the untreated MFC and the F‐MFC, which was attributed to the formation of hydrogen bonds at the interface between the amine groups of A‐MFC and the fluorine groups of PVDF. The elastic modulus and the permittivity of all composites increased with the amount of MFC up to a maximum value, depending on the MFC modification, and then decreased. This effect was due to the formation of MFC aggregates and porosity, as further confirmed by a comparison of experimental moduli with a classical composite mechanical model. The highest elastic modulus and highest permittivity were obtained for the untreated MFC and A‐MFC composites with 5 and 1 wt%.

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Type
research article
DOI
10.1002/pi.6202
Author(s)
Poothanari, Mohammed Arif  
•
Michaud, Véronique  
•
Damjanovic, Dragan  
•
Leterrier, Yves  
Date Issued

2021

Published in
Polymer International
Volume

70

Issue

9

Start page

1316

End page

1328

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SCI-STI-DD  
LPAC  
Available on Infoscience
February 25, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/175530
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