抄録
The two PVC samples, polymerized at different temperatures were fractionated by precipitation method, and the viscosities of concentrated solutions of these fractions were measured by coaxial cylindrical viscometer, at the temperature ranging from 35 to 75°C.
The viscosities of the concentrated solution of two samples are proportional to the degree of polymerization (PW) in power of 3.4, and to the concentration in the power of 5, but the apparent activation energy of flow of the sample, polymerized at low temperature (low temp. polymer) is higher than the polymers polymerized at high temperature (high temp. polymer). The degree of entanglement in the solution of low temperature polymer is much higher than that of high temperature polymer.
