Thermomechanical Characterization of High Tg Disulfide-Containing Thermoplastic Polyimides

IF 5.2 1区化学 Q1 POLYMER SCIENCE Macromolecules Pub Date : 2025-02-07 DOI:10.1021/acs.macromol.4c02693

Margaret A. Hall, Broderick Lewis, Kenneth R. Shull

引用次数: 0

Abstract

Covalent adaptable networks are frequently studied as alternatives to conventional thermosetting polymers because they can be recycled and reprocessed; however, the inclusion of dynamic covalent bonds within high-temperature (or high-performance) engineering thermoplastics remains largely unexplored. In this work, dynamic disulfide-containing thermoplastic polyimides were synthesized and compared to nondynamic thermoplastic polyimides. The thermomechanical properties of these polymers were examined by utilizing several techniques, including thermogravimetric analysis, differential scanning calorimetry, along with the use of the rheometric quartz crystal microbalance, and traditional dynamic mechanical analysis. The resulting experimental data suggest that the thermal stability of the dynamic compositions was slightly reduced in comparison to the nondynamic analogs, but the dynamic compositions exhibit a similar mechanical response under service conditions. The dynamic compositions also demonstrated significantly easier reprocessability via compression molding than their nondynamic counterparts.

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高Tg含二硫化物热塑性聚酰亚胺的热力学特性

共价自适应网络经常被研究作为传统热固性聚合物的替代品，因为它们可以回收和再加工；然而，在高温（或高性能）工程热塑性塑料中包含动态共价键在很大程度上仍未被探索。本文合成了动态含二硫化物的热塑性聚酰亚胺，并与非动态热塑性聚酰亚胺进行了比较。利用热重分析、差示扫描量热法、流变石英晶体微天平和传统的动态力学分析等多种技术对这些聚合物的热力学性能进行了检测。实验结果表明，与非动态类似物相比，动态组合物的热稳定性略有降低，但在使用条件下，动态组合物的力学响应相似。通过压缩成型，动态组合物也比非动态组合物更容易再加工。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.