PVDF-MWNT interactions control process induced β-lamellar morphology and orientation in the nanocomposites

Physical Chemistry Chemical Physics : PCCP
Mohan Raj ManiSuryasarathi Bose

Abstract

The effect of methylene blue (MB) modified multiwall carbon nanotubes (MWNTs) on the nucleation and morphology of polyvinylidene fluoride (PVDF) in comparison with the effect of MWNTs was systematically assessed by DSC, 13C NMR, FT-IR, TEM, WAXS and SAXS analysis. TEM analysis of ultra-microtomed samples revealed that MB modification enhanced the dispersibility of MWNTs in PVDF. Further, the nanocomposites were subjected to mechanical rolling and the synergistic effect of processing and fillers on the PVDF morphology (before and after rolling) at different length scales was studied. Both FT-IR and WAXS analyses suggested that mechanical rolling transforms α-PVDF to β-PVDF (ca. 88%). TEM and two-dimensional WAXS analyses revealed that the MWNTs and β-crystallites are oriented preferentially along the rolling direction and the degree of orientation is not influenced by the fillers suggesting that crystallite orientation is fully controlled by mechanical rolling. On the other hand, β-lamellae showed perpendicular orientation with respect to the rolling direction. Unlike β-crystallites, the β-lamellar morphology and orientation are highly governed by the fillers as evident from SAXS analysis. Using MWNTs and the MWNT-MB π-complex, ...Continue Reading

References

Jun 10, 1983·Science·A J Lovinger
Jan 15, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·J S Andrew, D R Clarke
Dec 4, 2008·Journal of Nanoscience and Nanotechnology·Soon Man Hong, Seung Sang Hwang
Jun 1, 2012·The Journal of Physical Chemistry. B·Ying WuDarryl S Williams
Jun 20, 2013·ACS Applied Materials & Interfaces·Valentina CaudaGiancarlo Canavese
Jun 13, 2014·Physical Chemistry Chemical Physics : PCCP·Maya SharmaSuryasarathi Bose

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Methods Mentioned

BETA
differential scanning calorimetry
X-ray
NMR

Software Mentioned

Rigaku 2DP

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