Poly(vinylidene fluoride‐co‐hexafluorpropylene)/polyaniline conductive blends: Effect of the mixing procedure on the electrical properties and electromagnetic interference shielding effectiveness

Poly(vinylidene fluoride‐co‐hexafluoropropylene)/polyaniline (PVDF‐co‐HFP/PAni) conductive blends were prepared by two methodologies involving the in situ polymerization in two different media and dry blending approach using ball milling. Dodecylbenzenesulfonic acid (DBSA) was used both as surfactan...

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Bibliographic Details
Published in:Journal of applied polymer science 2021-01, Vol.138 (3), p.n/a
Main Authors: Pontes, Ketly, Indrusiak, Tamara, Soares, Bluma G.
Format: Article
Language:English
Subjects:
Ball milling
Blending
blends
conducting polymers
dielectric properties
Dimethylformamide
Electrical properties
Electrical resistivity
Electromagnetic shielding
Fluorides
Materials science
Polyanilines
Polymer blends
Polymerization
Polymers
Sodium dodecylbenzenesulfonate
Thermal stability
Thermogravimetric analysis
thermoplastics
Toluene
Vinylidene
Vinylidene fluoride
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Summary:Poly(vinylidene fluoride‐co‐hexafluoropropylene)/polyaniline (PVDF‐co‐HFP/PAni) conductive blends were prepared by two methodologies involving the in situ polymerization in two different media and dry blending approach using ball milling. Dodecylbenzenesulfonic acid (DBSA) was used both as surfactant and as protonating agent in PAni synthesis. X‐ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet–visible (UV–Vis) spectroscopy, and thermogravimetric analysis were used for characterizing the blends. PAni and PVDF/PAni prepared by in situ polymerization in H2O/toluene medium exhibited superior electrical conductivity, higher thermal stability and significantly higher electromagnetic interference shielding effectiveness (EMI SE) than those prepared in H2O/dimethylformamide (DMF) medium. PVDF/PAni with high‐PAni content (>40%) prepared by the dry blend approach presented higher conductivity and EMI SE than those prepared by in situ polymerization. The molding temperature exerted significant influence on the conductivity and EMI SE for the blend containing higher amount of PAni. The free‐solvent dry blending approach using ball milling presented similar conductivity value but the higher EMI SE when compared with in situ polymerization, and is considered environmentally and technologically interesting.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.49705