On the presence of critical temperatures of mixing according to the data on the dependence of the intrinsic viscosity of polyvinyltrimethylsilane on the temperature
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The influence of temperature on the viscosity of dilute solutions of polyvinyltrimethylsilane, synthesized by ionic polymerization on ethyllithium, in a number of solvents of various kinds, as well as the change in the viscosity of dilute solutions of biological macromolecules of deoxyribonucleic acid (DNA) and deoxyribonucleoprotein (DNP) during heating was investigated.
The data obtained are interpreted in accord with the theory of solutions of polymers developed by Paterson on the basis of the presence of lower and (or) upper critical temperatures of mixing in a number of polymer-solvent systems. In the case of deoxyribonucleoprotein, the anomalous threefold increase in the viscosity before the beginning of the helix-ball transition during heating is explained by dissociation of protein from DNA and an increase in the asymmetry of the molecule on account of a change in the conformation of the DNA contained in the DNP or a disruption of the supermolecular structure of the DNP itself.
KeywordsPolymer Viscosity Macromolecule Critical Temperature Intrinsic Viscosity
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