Viscosity of Polyacrylonitrile Solutions: The Effect of the Molecular Weightстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 мая 2016 г.
Аннотация:The copolymer of acrylonitrile with methyl acrylate and itaconic acid (93 : 5.7 : 1.3) is synthesized
via freeradical copolymerization. For solutions of the initial copolymer and its 12 fractions in dimethyl sulfoxide, viscosities are measured in a wide shearstress range. The viscosity behavior of 10% solutions is examined in more detail, and the rheological studies of several fractions are performed in the concentration interval from 5 to 20%. All solutions exhibit weak nonNewtonian behavior. This makes it possible to determine the zeroshear viscosity. The dependences of this viscosity on the numberaverage and weightaverage molecular masses for the equiconcentrated solutions obey an exponential law with the same exponent, equal to 2.3. The macromolecules of copolymers are inclined toward association. For lowmolecularmass fractions, this effect is the most pronounced.