聚对苯二甲酸乙二醇酯聚合体的线性粘弹性、非线性流变性及其应用

IF 2.702 Q1 Materials Science
Wei Zhang, Xiang Cui, Hongdong Zhang, Yuliang Yang, Ping Tang
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引用次数: 0

摘要

为提高聚对苯二甲酸乙二醇酯(PET)的力学性能和加工性能,通过引入动态网络将其升级为不同交联度的可加工聚酯聚酯。采用非等温结晶法、等温扫描法、频率扫描法和加入网络后的应力松弛法研究了PET玻璃体的热力学和线性粘弹性。流变学实验尤其对络合物的网络结构和键交换机制敏感。伪主曲线表明,松驰过程由三个特征区组成:罗思型网束松驰区、橡胶平台区和网束末端松驰区,与可逆凝胶化(RG)模型一致。由于两种弛豫行为的温度依赖性不同,利用时间-温度叠加原理可得到两个不同的活化能(流动活化能和化学反应活化能)。此外,在相同Weissenberg数下,通过拉伸流动和启动剪切研究了PET玻璃体的非线性流变特性,发现所有玻璃体都有明显的应变硬化行为。不同交联密度的玻璃体随着拉伸速率的增加呈现出明显的应变硬化趋势,与材料的延性相对应。在动力学研究的基础上,进一步定量探讨了自修复性能和焊接性能,以供工业应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Linear viscoelasticity, nonlinear rheology and applications of polyethylene terephthalate vitrimers

Linear viscoelasticity, nonlinear rheology and applications of polyethylene terephthalate vitrimers

To enhance mechanical properties and processing performance of poly(ethylene terephthalate) (PET), it was upcycled to processable PET vitrimers with different crosslinking degrees by introducing dynamic network. The thermodynamics and linear viscoelasticity of PET vitrimers were explored by non-isothermal crystallization, isothermal sweep, frequency sweep and stress relaxation after incorporation of network. In particular, rheology experiments are sensitive to network structure and bond exchange mechanism in vitrimers. The pseudo-master curves show that relaxation processes are composed of three characteristic regions: Rouse-type relaxation of network strands, rubbery plateau and terminal relaxation of network, which is consistent with reversible gelation (RG) model. Two distinct (flow and chemical reaction) activation energies, are obtained by time–temperature superposition principle due to different temperature dependences of two relaxation behaviors. In addition, nonlinear rheology of PET vitrimers was investigated by extensional flow and start-up shear at the same Weissenberg number, and obvious strain hardening behavior were observed in all vitrimers. However, vitrimers with different crosslinking density exhibited distinct strain hardening trends as increase of extensional rate, corresponding to the ductility of material. On the basis of kinetics study, self-repairing and welding properties are further quantitatively explored for industrial applications.

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来源期刊
CiteScore
5.20
自引率
0.00%
发文量
0
审稿时长
1.8 months
期刊介绍: Part A: Polymer Chemistry is devoted to studies in fundamental organic polymer chemistry and physical organic chemistry. This includes all related topics (such as organic, bioorganic, bioinorganic and biological chemistry of monomers, polymers, oligomers and model compounds, inorganic and organometallic chemistry for catalysts, mechanistic studies, supramolecular chemistry aspects relevant to polymer...
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