EVOH的流变性能  

Rheological behavior of EVOH

作　　者：王瑞[1] 李树锋[1] 黄俊鹏[1] 

机构地区：[1]天津工业大学改性与功能纤维天津市重点实验室,天津300160

出　　处：《纺织学报》2009年第2期9-12,共4页Journal of Textile Research

摘　　要：为研制新型PET/EVOH复合吸湿纤维,确定合理的复合纺丝工艺参数,对芯层组分EVOH熔体的流动性能进行了系统研究。结果表明,EVOH属假塑性流体,非牛顿指数小于1,表观黏度随温度的升高或剪切速率的增加呈下降趋势。与加工温度为250、260℃时相比,当EVOH在加工温度为240℃进行挤出时,非牛顿指数为0.712,最接近牛顿流体。在240、250、260℃进行挤出时,EVOH的黏流活化能在400~500 J/mol之间,且黏流活化能随剪切速率增加而增加。A series of studies on the rheological behavior of EVOH melt were carried on,so as to provide the optimal spinning parameters to prepare the PET/EVOH sheath-core fiber.The experimental results showed that EVOH belongs to the pseudo plasticity liquid,the non-Newton exponent is less than 1 and the apparent viscosity decreases with the increasing of the temperature or the shear rate.The non-Newton exponent of EVOH is 0.712 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 J/mol when spinning performed at 240,250 and 260℃,which increases with the increasing of the shear rate.

关 键 词：乙烯/乙烯醇共聚物 流变性 可纺性 活化能 非牛顿指数 

分 类 号：TQ342.206[化学工程—化纤工业]