Inverse gas chromatography has been used to examine the dispersive and acid-base forces contributing to the potential work of adhesion of three commercial polymers: the polyetherimide Ultem-1000 and the liquid crystal polymers Rodrun-LC 5000 and Vectra B-950. Acid-base interaction enthalpies of each polymer with different low-molecular-weight probes have been determined. In this analysis, dispersion and specific interactions are considered to contribute independently to the adsorption of probe molecules at the adsorbent surface. Following the approach of Gutmann, these enthalpies were correlated with donor and new acceptor numbers of the probes, both in thermodynamically consistent units. From this approach, parameters expressing the polymer ability to accept or donate electrons were obtained. The polymers may be described as being amphoteric, Ultem 1000 having a predominant basicity.
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Alfageme et al. (1995) studied this question.
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