超支化聚合物对PP染色性及流变性的影响

将超支化聚合物应用于聚丙烯纤维(PP)的共混改性,共混比例为2%~10%。实验结果表明:超支化聚合物的加入改善了PP的染色性,当超支化聚合物的质量分数为8%时,PP的上染率达到70%。共混体系为非牛顿假塑性流体,其表观黏度随剪切速率的增大而减小;随着超支化聚合物含量增大,共混物非牛顿流动指数上升,剪切速率上升,流变性能改善;共混物黏流活化能可达47.83 kJ/mol,黏温依赖性随着超支化聚合物含量的增加而增大。超支化聚合物含量为2%~4%时,拉伸强度上升约10%。

Dyeability and rheological property of PP modified with hyperbranched polymer

The hyperbranched polymer was blended PP at the proportion of 2%-10% to improve the properties of PP.It was found that the hyperbranched polymer improved the dyeing property of PP with dye-uptake up to 70% when the content of hyperbranched polymer was 8%.The blend systems are non-Newtonian pseudoplastic fluid,and its apparent viscosity decreases as the shear rate increases.The non-Newtonian index and the shear rate of the blend increase as hyperbranched polymer content enhance,and the rheological property is improved.The viscous flow activity energy ascends to(47.83 kJ/mol),and the temperature dependence of viscosity increases with hyperbranched polymer content increasing.When the content of hyperbranched polyamide is 2%,the tensile strength is increased by about 10%.