Polarity of Thymine and 6-Methyluracil-Modified Porous Polymers, According to Data from Inverse Gas Chromatography

The affinity of surfaces of porous polymer Polysorb-1 samples modified with thymine (5-methyluracil) and 6-methyluracil toward sorbates capable of various intermolecular interactions is studied via inverse gas chromatography in the infinite dilution mode. It is found that the first modifier yields one-dimensional tape supramolecular structures as a result of self-assembling, while the second produces two-dimensional network structures. The contributions from intermolecular interactions to the Helmholtz energy of adsorption are calculated via the linear decomposition of retention parameters. The dispersion and specific components of the energy of adsorption are determined according to Dong. It is shown that modifying the surface of a porous polymer with thymine increases both specific and dispersive components of the energy of adsorption, while the contributions from different intermolecular interactions and the polarity of the surface as a result of modifying with thymine change slightly. Modifying a porous polymer with the same amount of 6‑methyluracil results in a notable rise in polarity, due to an increase in the contributions from interactions of induction and orientation.