TY - JOUR
T1 - Viscosity Behaviour of Dilute and Moderately Concentrated Solutions. 1. Poly(vinylpyrrolidone) in 2-propanol
AU - Ayal, Hugo
AU - Gargallo, Ligia
AU - Radić, D.
PY - 1993/12/1
Y1 - 1993/12/1
N2 - The zero-shear viscosity of dilute to moderately concentrated poly(vinylpyrrolidone) solutions in 2-propanol were measured at different temperatures in the newtonian flow range. The viscosity data were analyzed in terms of Martin's and Fedor's equations. The viscosity-concentration data were generalized in terms of reduced variables. The relation between the KMparameter for the rheological interaction and some characteristics of polymer solutions such as the flexibility of the PVP chain is discussed. The temperature dependence of viscosities was expressed by the Arrhenius-Frenkel-Eyring equation and the activation energy of viscous flow of polymer solutions (ΔGv) was calculated. It was shown that ΔGv increases with concentration and it is independent of the temperature.
AB - The zero-shear viscosity of dilute to moderately concentrated poly(vinylpyrrolidone) solutions in 2-propanol were measured at different temperatures in the newtonian flow range. The viscosity data were analyzed in terms of Martin's and Fedor's equations. The viscosity-concentration data were generalized in terms of reduced variables. The relation between the KMparameter for the rheological interaction and some characteristics of polymer solutions such as the flexibility of the PVP chain is discussed. The temperature dependence of viscosities was expressed by the Arrhenius-Frenkel-Eyring equation and the activation energy of viscous flow of polymer solutions (ΔGv) was calculated. It was shown that ΔGv increases with concentration and it is independent of the temperature.
KW - Zero-shear viscosity master curve Martin’
KW - s constant free energy activation viscous flow
UR - https://www.scopus.com/pages/publications/0027813421
U2 - 10.1080/00914039308009658
DO - 10.1080/00914039308009658
M3 - Article
AN - SCOPUS:0027813421
SN - 0091-4037
VL - 23
SP - 47
EP - 55
JO - International Journal of Polymeric Materials and Polymeric Biomaterials
JF - International Journal of Polymeric Materials and Polymeric Biomaterials
IS - 1-2
ER -