阳离子染料可染聚酯熔体流变性能研究

Rheological properties of cationic dyeable polyester melt

分别以间苯二甲酸二乙二醇酯-5-磺酸钠(SIPE)、间苯二甲酸-5-磺酸钠(SIPA)为第三单体制备阳离子染料可染聚酯(CDP)(分别标记为SIPE-CDP、SIPA-CDP),通过毛细管流变仪研究2种CDP的熔体流变性能,并进行对比。结果表明:相比于SIPE-CDP,SIPA-CDP熔体表观黏度(η;)在较低温度(275℃)时明显较高,且随温度上升二者的η;逐渐接近;SIPA-CDP的非牛顿指数(n)在275~285℃时较小,且对温度的敏感程度较大,SIPA-CDP的黏流活化能(△E;)较大,且对温度的依赖性更高;SIPA-CDP的结构黏度指数(△η)在275~285℃时较高,且随温度的升高△η降低更快,在纺丝过程中SIPA-CDP对温度控制的要求需更加严格;对于SIPA-CDP而言,在SIPA添加量较高(摩尔分数为5.0%或10.0%)时,SIPA-CDP的△E;较大,熔体流动性能较差;当添加SIPA摩尔分数为5.0%时,SIPA-CDP熔体的△η较高,该含量下SIPA-CDP的可纺性较差。

Cationic dyedyeable polyesters(CDP)(labeled as SIPE-CDP and SIPA-CDP respectively)was prepared with 5-sodium dihydrogen 5-sulfoisophthalate(SIPE)or sodium 5-sulfo dimethylisophthalate(SIPA)as the third monomer.The rheological properties of the two CDP melts were studied and compared by capillary rheometer.The results showed that compared with SIPE-CDP melt,SIPA-CDP melt had an obviously higher apparent viscosity(η;)at a lower temperature(275℃),which gradually approached that of SIPE-CDP with the increase of temperature,exhibited lower non-Newtonian index(n)at 275-285℃and more sensitive to temperature,higher viscous flow activation energy(△E;)with higher dependence on temperature,higher structural viscosity index(△η)at 275-285℃with higher drop rate with the increase of temperature,and required more strict temperature control requirements in the spinning process;SIPA-CDP had a higher△E;and poorer melt flow performance at a higher SIPA addition amount(5.0%or 10.0%by mole fraction);and SIPA-CDP exhibited a higher△ηand poorer spinnability when the mole fraction of SIPA was 5.0%.