Flow sorption calorimetry, a powerful tool to investigate the acid-base character of organic polymer surfaces |
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| Authors: | S Schneider F Simon D Pleul H-J Jacobasch |
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| Institution: | (1) Institute of Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany, DE |
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| Abstract: | Flow sorption calorimetry (FSC) can be a useful tool to estimate the Lewis acid-base behaviour of the surface of organic
polymers with less than 1 m2/g surface area. Polyethylene powders grafted with different amounts of acrylic acid have been chosen as samples. The surface
of the powders was investigated by means of X-ray photoelectron spectroscopy (XPS) at first and than brought into contact
with the strong electron donor triethylamine in a special FSC measuring system. The heat of the displacement isotherm together
with the surface excess isotherm of triethylamine adsorbed onto the powders was determined. The results obtained with FSC
and XPS were well correlated and gave a comprehensive picture of the acidic surface character of modified polyethylene.
Received: 19 September 1996 / Revised: 22 January 1997 / Accepted: 26 January 1997 |
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