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系统研究了消除热历史后的G1~G5端羟基超支化聚酯熔体及组分质量比为1∶1的二元共混物的流变行为。结果表明,无论是稳态剪切测试还是振荡测试,消除热历史后的G2~G5端羟基超支化聚酯熔体均表现为牛顿流体的流变行为。G3~G5端羟基超支化聚酯的流变行为均遵循Cox-Merz方程。G2端羟基超支化聚酯在振荡测试的高频区出现了剪切增稠现象。对于组分质量比为1∶1的低代/高代端羟基超支化聚酯二元共混物,无论是稳态剪切还是振荡剪切,只要一种组分是牛顿流体,那么二元共混体系也是牛顿流体。高代数组分决定了二元共混物的流变特性,而低代数组分主要影响二元共混物的黏度。
The rheological behavior of G1 ~ G5 hydroxyl terminated hyperbranched polyester melt and binary blend with mass ratio of 1: 1 were investigated systematically after the elimination of thermal history. The results show that the rheological behaviors of Newtonian fluids behave as G2 ~ G5 hydroxyl hyperbranched hyperbranched polyesters, both in the steady-state shear test and the oscillation test. The rheological behaviors of G3 ~ G5 hydroxyl-terminated hyperbranched polyesters all follow the Cox-Merz equation. G2 terminal hydroxyl hyperbranched polyester in the high frequency oscillation test showed shear thickening phenomenon. For the low-generation / high-generation hydroxyl-terminated hyperbranched polyester binary blends with mass ratio of 1: 1, both steady-state shear and oscillatory shear, as long as one component is Newtonian fluid, The blend system is also Newtonian. High algebraic components determine the rheological properties of the binary blends, while low algebraic components primarily affect the viscosity of the binary blends.