Miscibility and Surface Properties of Fluorinated Copolymer Blends Involving Hydrogen-Bonding Interactions
Huang, H.L. Goh, S.H. Lai, D.M.Y. Wee, A.T.S. Huan, C.H.A.
Huang, H.L.
Lai, D.M.Y.
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Abstract
The miscibility and underlying hydrogen-bonding interactions of blends of a fluorinated copolymer containing pyridine and a nonfluorinated copolymer containing methaerylic acid were studied with differential scanning calorimetry (DSC), transmission Fourier transform infrared (TX-FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS), whereas the surface properties of the blends were investigated with contact-angle measurements, time-of-flight secondary-ion mass spectroscopy, XPS, and attenuated total reflectance Fourier transform infrared spectroscopy. DSC studies showed that the presence of a sufficient amount of 4-vinylpyridine units in the fluorinated copolymer produced miscible blends with the nonfluorinated copolymer containing methacrylic acid. TX-FTIR and XPS showed the existence of pyridine-acid inter-polymer hydrogen-bonding interactions. Even though the anchoring effect of hydrogen bonding hindered the migration of the fluorinated component to the blend surface, it could not completely eliminate the surface enrichment of the fluorinated component and the surface rearrangement of the fluorinated pendant chain. The air-blend interface was mainly occupied by the fluorinated pendant chain, and the surface energies of the blends were extremely low, even with only 1.5 wt% of the fluorinated component in the blends. © 2004 Wiley Periodicals, Inc.
Keywords
ESCA/XPS, Fluorinated polymer blends, FT-IR, Miscibility, Specific interactions, Surface properties
Source Title
Journal of Polymer Science, Part B: Polymer Physics
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Date
2004-04-01
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Article