Influence of process conditions and effect of functionalization in inducing time dependent polymorphic states in single walled carbon nanotube incorporated poly(vinylidene fluoride)

Autor: Rinu Elizabeth Roy, K.P. Vijayalakshmi, S. Bhuvaneswari, R.S. Rajeev
Rok vydání: 2019
Předmět:
Zdroj: SN Applied Sciences. 1
ISSN: 2523-3971
2523-3963
DOI: 10.1007/s42452-019-0862-0
Popis: Poly(vinylidene fluoride) (PVDF) based composites were prepared using the compatibilizing properties of optimally functionalized single walled carbon nanotubes (SWCNTs). Our previous studies revealed that acid treatment of SWCNTs for 4 h (FSWCNT-4) incorporates maximum concentration of –COOH functional groups on nanotube surface with least defects. Therefore, PVDF-SWCNT composites were prepared by dispersing FSWCNT-4 in PVDF through ultrasonication. Here time of ultrasonication controls the crystallization of the polymer either in the electroactive γ phase or in the non-electroactive α phase. γ polymorphic state is easily obtained with very low concentration of FSWCNT-4 followed by ultrasonication for just 5 min. The chemical composition of the composites is studied using X-ray photoelectron spectroscopy confirming the inclusion of nanotubes in PVDF. Computational analysis explained the role of ultrasonication in providing the required energy for the transformation from α phase to γ phase apart from establishing the favourable site of interaction of PVDF with FSWCNT-4. The micrographs of the composite showed scrolled lamellar features of γ phase morphology. PVDF-FSWCNT-4 composites showed 54% higher capacitance compared to its unfilled counterpart with significant improvement in mechanical properties due to stronger interactions between H atom with positive charge in PVDF and “O” atom with π orbital in FSWCNT-4.
Databáze: OpenAIRE
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