期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 138, 期 3, 页码 -出版社
WILEY
DOI: 10.1002/app.49705
关键词
blends; conducting polymers; dielectric properties; thermoplastics
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [303457/2013-9]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior [001]
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro [E-26/202.830/2017]
The conductive blends of PVDF-co-HFP/PAni were prepared by in situ polymerization and dry blending approach, showing that samples prepared in H2O/toluene medium exhibited better performance. Different preparation methods and material compositions have significant effects on conductivity 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 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.
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