Abstract:

A series of polymeric diols with different comb-branched chains (CPDs) were prepared and characterized by FTIR.The effects of comb-branched structure and temperature on the rheological properties of CPDs were studied.The flow activation energy ΔE_η0 of CPDs was also measured.The results showed that the viscosity of CPDs increased and the shear rate at the beginning of shear thinning behavior decreased with increasing length and polarity of comb-branched chains.Two kinds of shear thinning behavior were shown on the η-γ curves of CPDs.A plateau existed between these two kinds of shear thinning behavior on the η-γ curves of CPDs.The plateau moved toward the high shear rate and shortened with increasing temperature, and disappeared at 50℃.The flow activation energy ΔE_η0 increased with the increase of length and polarity of comb-branched chains.

Key words: 梳状聚合物, 结构, 流变性能

摘要：

制备了一系列支链结构不同的梳状聚合物二元醇(CPD)，并用FTIR对其结构进行了表征。着重研究了CPD梳状支链结构和温度对其流变性能的影响，并测定了CPD的流动活化能ΔE_η0。研究发现，梳状支链的长度增加和极性增大，CPD的黏度增加，出现剪切变稀行为的剪切速率降低。CPD的η-γ曲线出现两次剪切变稀行为，在两次行为之间存在一平台，这一平台随温度增加向高剪切速率方向移动，并逐渐变短，最后在50℃时消失。随梳状支链长度增加和极性增大，CPD的流动活化能ΔE_η0增加。

关键词: 梳状聚合物, 结构, 流变性能