Rutherford backscattering spectrometry and computer simulation for the in-depth analysis of chemically modified poly(vinylidene fluoride)

The alkaline treatment of poly(vinylidene fluoride) (PVdF), in the presence of phase transfer catalysts (PTCs) has been investigated. Rutherford backscattering spectrometry (RBS) has been used to determine the depth of modification achieved and to provide compositional depth profiles of modified PVd...

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Bibliographic Details
Published in:Journal of materials science 2001-10, Vol.36 (19), p.4731-4738
Main Authors: ROSS, G. J, BARRADAS, N. P, HILL, M. P, JEYNES, C, MORRISSEY, P, WATTS, J. F
Format: Article
Language:English
Subjects:
Applied sciences
Backscattering
Chemical modifications
Chemical reactions and properties
Computer simulation
Defluorination
Exact sciences and technology
Fluorides
Fluorine
Materials science
Organic chemistry
Organic polymers
Oxygenation
Phase transfer catalysts
Physicochemistry of polymers
Polyvinylidene fluorides
Reaction kinetics
Scientific imaging
Sodium hydroxide
Spectrometry
Spectroscopy
Substrates
Vinylidene fluoride
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Summary:The alkaline treatment of poly(vinylidene fluoride) (PVdF), in the presence of phase transfer catalysts (PTCs) has been investigated. Rutherford backscattering spectrometry (RBS) has been used to determine the depth of modification achieved and to provide compositional depth profiles of modified PVdF samples. The complex chemical nature of the modified substrate, and the overlap of the elemental scattering edges within the depths involved (up to 1.4 μm), create RBS spectra which are difficult to interpret. The DataFurnace software has been applied to the data, leading to excellent results. Defluorination and oxygenation of PVdF occurs on treatment with NaOH and PTC. Through the use of samples prepared with the aim of establishing the kinetics of the modification, a mechanism concerning elimination of fluorine followed by oxygenation, is shown to occur. The RBS analysis indicates that the kinetics of the defluorination reaction follows the Case 1 (Fickian) diffusion law, and that the depth of treatment is of the order of 1.4 μm.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1017979005467