ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
1A viscometer to which variable pressures may be applied is shown to be convenient for measuring viscosities of sodium thymonucleate (NaTN).2The viscosities of solutions of NaTN investigated vary with velocity gradient. All of the solutions obey the empirical equation: \documentclass{article}\pagestyle{empty}\begin{document}$$ 1/pt = A + Bp $$\end{document} where p is the average pressure on the solutions during the outflow time, t. A is used to calculate what are believed to be characteristic relative viscosities.3The viscosity of solutions of alcohol precipitable NaTN is found to depend on the concentration according to the equation: \documentclass{article}\pagestyle{empty}\begin{document}$$ \eta _{{\rm sp}} /c = [\eta] + k″[\eta]\eta _{{\rm sp}} $$\end{document} Our preparation of NaTN gives values of 11.1 dl./g. and 0.24 for [η] and k″, respectively.4The viscosity of NaTN solutions not easily precipitable depends on the concentration according to the equation: \documentclass{article}\pagestyle{empty}\begin{document}$$ \eta_{{\rm sp}} /c = [\eta] + k′[\eta]^3 c $$\end{document} Our values for [η] and k′ are 21.8 dl./g. and 0.26, respectively.5The viscous behavior of NaTN is discussed in the light of modernP polymer theory.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1953.120110105
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