摘要
采用锥板流变仪，研究了共聚单体丙烯酰胺（AM）含量对聚丙烯腈溶液流变性的影响，探索一种预示炭纤维前驱体聚丙烯腈溶液可纺性的方法。发现：在低剪切速率区（〈200s^-1），黏度随AM引入增加；在高剪切速率区（〉200s^-1），均聚物和共聚物的流动曲线几乎重合。溶液的弹性因AM的引入而变大。松弛时间延长了5-6倍，这可能会造成纺丝过程中更大的挤出胀大比，溶液可纺性下降。溶液的时间稳定性和温度敏感性随AM的引入而降低。
From a point of rheology, an attempt was made to evaluate the spinnability of acrylonitrile-acrylamide （AN-AM） copolymers solutions for carbon fibers. The viscoelasticity was characterized by a rhcometer. It is found that at a low she4r rate （〈 200 s^-1）, the viscosity is a function of polymer composition and shear rate. Beyond 200 s^-1, the flowcurves of solutions with different AM content nearly overlap. Upon introducing AM eomonomer, the elasticity increases and the relax time is delayed 5 times. Also, the stability to time and sensitivity to spinning temperature of solutions are both considerably decreased.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2008年第10期63-66,共4页
Polymer Materials Science & Engineering
关键词
炭纤维
丙烯腈
丙烯酰胺
流变性
可纺性
carbon fibers
acrylonitrile
acrylamide
rheology
spinnability
