Magnetic study of some liquids and gases adsorbed on polymers

The paper reports on the measurements of magnetic susceptibility of methylalcohol and toluene adsorbed on polypropylenes of two different molecular masses PP 5056, PP 5078, polyethylene-terephtalate and cellulose. The measurements were carried out for the full range of covering, possible at room temperature, and comparison with the additivity law was made in the whole range of concentrations. With the exception of methylalcohol in PP 5078, all samples showed noticeable deviations from linearity in the dependence of susceptibility on the percentual share of the adsorbate, the deviations were towards decreasing diamagnetism. Polyethyleneterephtalate with methylalcohol showed contradictory results. The measurements were completed with a magnetic study of adsorption of natural air and pure oxygen on cellulose and PP 5506.As far as the interpretation is concerned, the measurements of magnetic susceptibility are in good agreement with experiments on high resolution nuclear magnetic resonance (NMR). From the experimental results the authors draw up conclusions as to the character of mutual interaction of polymers with given adsorbates, to the location of an adsorbed molecule on the polymer surface, and to the contribution of Van Vleck polarization paramagnetism and other susceptibility components on the experimental results.Toluene C₆H₅.CH₃, adsorbed on polypropylene, showed two more peaks beside a NMR signal of C₆H₅; they were identified as the signals of CH₃ adsorbed on non-equivalent parts of a polypropylene macromolecule.