Polymer melt molecule dynamics under impact of vibration force field (II) Effect of apparent viscidity
With the help of physical and analytical models of polymer molecule movement described in Part(Ⅰ),the expression of vibration frequency and polymer melt dynamic apparent viscidity is obtained.The theory is supplemented by a numerical sample and experiments which show that the dynamic apparent viscidity of polymer melt is related to vibration frequency,and it decreases as frequency increases;when the amplitude is longer than the length of polymer molecule chain,it does not affect the apparent viscidity.The theoretical result agrees with that of experiment,which proves that the physical model and the analytical model are valid.This research will serve as the basis for polymer processing and equipment design.