Structural and Quantitative Analysis of Surface Modified Poly(vinylidene Fluoride) Films Using ATR FT-IR Spectroscopy

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Abstract
The reaction of PVF2 films in aqueous NaOH with the use of tetrabutylammonium hydrogen sulfate as phase transfer catalyst results in surface dehydrofluorination. Subsequent examination of the PVF2 surface using ATR FT-IR affords evidence as to the structure of dehydrofluorinated PVF2. It is found that the infrared bands at 1402, 1225, 1194, and 882 cm−1 are sensitive to the surface treatment. The origin and behavior of these bands are discussed. It is observed that upon dehydrofluorination the FT-IR spectra of the PVF2 surface exhibit two infrared bands at 1613 cm−1 and 1717 cm−1 which arise from the formation of carbon-carbon double bonds. The band at 1613 cm−1 is due to conjugated -(-CH=CF-)- units, whereas the 1717 cm−1 band is assigned to the -(-CF=CF-)- units which arise from resonance at structural head-to-head and tail-to-tail defects.