Effect of ultra high molecular weight Polyacrylonitrile (UHMW-PAN) on the Rheological Behavior of PAN/DMSO solution

摘要

The effects of ultra high molecular weight Polyacrylonitrile (UHMW-PAN) on the rheological behavior of PAN/DMSO solution have been investigated using a cone-plate rheometer in this work.The rheological behavior was characterized by steady shear and oscillation test It is observed from the measurements that,the rheological behavior of the polymer mixture of UHMW-PAN and AMW-PAN makes a difference to the AMW-PAN solution due to macromolecular entanglements,the viscosities of the solutions decreased with the rising of shear rate,shear viscosity rise with the increase of the molecular weight of the UHMW-PAN.For dynamic experiments,a steady increase of both G′ and G" with the increase of oscillation frequency and molecular weight of UHMW-PAN was seen for all samples.The G′ and G" increase with the decrease of the temperature or with the increase of the contents of the UHMW-PAN.