EVOH的流变性能.pdf

30 2 Vol . 30 No. 2 2009 2 Journal of Textile Research Feb . 2009 : 2009 EVOH 王 瑞, 李树锋, 黄俊鹏 ( , 300 160 PETEVOH , , EVOH , EVOH , 1, 250260 , EVOH 240 , 0712, 240250260 , EVOH 400~ 500 Jmol , ; ; ; ; :TQ 342206 : A Rheological behavior of EVOH WANG Rui, LI Shufeng, HUANG Junpeng ( TianjinKey Laboratory of Fiber Modfi ication and Functional Fiber, Tianj in Polytechnic University , Tianjin 300160, China Abstract A series of studies on the rheological behavior of EVOH melt were carried on, so as to provide the opt imal spinning parameters to prepare the PETEVOH sheathcore fiber. The experimental results showed that EVOH belongs to the pseudo plasticity liquid , the nonNewton exponent is less than 1 and the apparent viscosity decreases with the increasing of the temperature or the shear rate. The nonNewton exponent of EVOH is 0712 when extrusion spinning is carried out at the temperature of 240 , which is closer to the Newton liquid as compared with spinning at the temperature of 250 and 260 . The activation energy of EVOH is between 400 and 500 Jmol when spinning performed at 240, 250 and 260 , which increases with the increasing of the shear rate. Key words EVOH ( ethylene vinyl alcohol ; rheological behavior; spinnability; activation energy; non Newton exponent EVOH , EVOH [ 1- 4] , Brabenber OHG EVOH , 175~ 250 [ 5- 6] , , EVOH , 1990 ,