On the presence of critical temperatures of mixing according to the data on the dependence of the intrinsic viscosity of polyvinyltrimethylsilane on the temperature

Autor:	S. G. Durgar'yan, F. F. Khodzhevanov, N. S. Nametkin, O. B. Semenov
Rok vydání:	1970
Předmět:	chemistry.chemical_classification Deoxyribonucleoprotein media_common.quotation_subject Intrinsic viscosity Thermodynamics General Chemistry Polymer Asymmetry Dissociation (chemistry) chemistry Organic chemistry Molecule Ionic polymerization Macromolecule media_common
Zdroj:	Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 19:235-239
ISSN:	1573-9171 0568-5230
DOI:	10.1007/bf00853363
Popis:	1. 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. 2. 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.
Databáze:	OpenAIRE
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