Rate-dependent adhesion between opposed perfluoropoly(alkyl ether) layers: dependence on chain-end functionality and chain length

Article Abstract:

A study was conducted to measure adhesion between opposed molecularly thin layers of perfluoropoly(alkyl ether)s on mica, with emphasis on the dependence of the adhesion on chain-end functionality and chain length of the polymer. Experimental results indicated that increases in the adhesion between thin, adsorbed layers of perfluoropoly(alkyl ether) with different chain-end functionality correlated with the logarithmic unloading rate.

Polymers, Adhesion, Adhesion (Surface chemistry)

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Static and dynamic forces between absorbed polyelectrolyte layers (quaternized poly-4-vinylpyridine)

Article Abstract:

Static forces and dynamic shear forces were measure between quaternized poly-4-vinylpyridine layers (QPVP) absorbed onto mica from 1 mM borate buffer with or without added 0.25 M NaCl. At the photoelectrolyte concentration chosen, 0.4 mg mL(super -1), extended layers were formed at all absorption conditions.

Science & research, All Other Miscellaneous Chemical Product and Preparation Manufacturing, Chemical preparations, not elsewhere classified, Polyelectrolytes, Electric properties, Mica, Vinyl compounds

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Tribology of confined Fomblin-Z perfluoropolyalkyl ethers: role of chain-end chemical functionality

Article Abstract:

A study of static and shear interactions between smooth surfaces separated by molecularly thin films of Fomblin-Z oligomers is presented. Results demonstrate the effect of polar end groups of fluorinated chain nonpolar environment on the films.

United States, Chemistry, Physical and theoretical, Physical chemistry, Oligomers, Fluorination

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