Rheological and mechanical properties of dynamic covalent polymers based on imine bond,Journal of Applied Polymer Science

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Rheological and mechanical properties of dynamic covalent polymers based on imine bond
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-05-01 , DOI: 10.1002/app.50953
Xiangyu Li ₁ , Tongfei Wu ₁

Affiliation

Dynamic covalent polymers based on imine bond (FPIs), which are capable of reorganizing their constitution on the molecular level, are prepared from bio‐based dimer fatty acids. The irregular structure of carbon chains in dimer fatty acids leads to the amorphous nature of FPIs. The effect of imine bond on the glass transition temperature of FPIs is studied by differential scanning calorimetry. The linear viscoelasticity of FPIs is investigated by small amplitude oscillatory shear tests and analyzed by using the Likhtman‐McLeish theory. It is found that the rheological behavior of FPIs is similar with that of static, linear entangled polymers predicted by Likhtman‐McLeish theory, when the dynamic chain arrangements caused by imine‐bond exchange is not active enough. For FPIs, the temperature variation of viscosity is still following the Arrhenius law with an activation energy of ~50 kJ mol⁻¹. Owing to the thermal adaptability, FPIs demonstrate great malleability, self‐healing capability and processing stability at elevated temperatures.

中文翻译：

基于亚胺键的动态共价聚合物的流变和力学性能

基于亚胺键（FPI）的动态共价聚合物能够在分子水平上重组其结构，是由基于生物的二聚脂肪酸制备的。二聚脂肪酸中碳链的不规则结构导致FPI的无定形性质。通过差示扫描量热法研究了亚胺键对FPIs玻璃化转变温度的影响。FPI的线性粘弹性通过小振幅振荡剪切试验进行研究，并使用Likhtman-McLeish理论进行分析。结果发现，当由亚胺键交换引起的动态链排列不够活跃时，FPI的流变行为与Likhtman-McLeish理论预测的静态，线性缠结聚合物的流变行为相似。对于FPI，^-1。由于热适应性，FPI在高温下显示出出色的延展性，自我修复能力和加工稳定性。

更新日期：2021-05-04

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