制备并表征具有优异机械和形状记忆特性的 4D 可打印 PCL/SEBS-g-MAH 混合物

IF 3.2 4区 工程技术 Q2 ENGINEERING, CHEMICAL Polymer Engineering and Science Pub Date : 2024-08-27 DOI:10.1002/pen.26947
Shuojun Gu, Donglei Liu, Lei Zhu, Yangdong Xie, S. A. Evsyukov, Xin Luo
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引用次数: 0

摘要

这项研究的重点是开发一种新型热响应形状记忆聚(ε-己内酯)(PCL)/马来酸酐接枝聚[苯乙烯-b-(乙烯-共丁烯)-b-苯乙烯](SEBS-g-MAH)共混物,这种共混物具有更强的形状记忆和机械性能,适合三维打印应用。通过 DSC、TGA、力学测试和动态流变分析,对共混物的热学、力学和流变特性进行了严格评估。结果表明,共混物的断裂伸长率超过了 1000%,这可归因于共连续结构的形成。通过水浴循环法表征的热响应形状记忆特性表明,PCL4/MAH6 表现出最佳的综合性能(形状固定率为 97.22%,形状恢复率为 96.67%),并在 10 次循环测试后保持稳定。此外,还研究了印刷参数对形状记忆特性的影响,结果表明,在层厚为 0.1 毫米、热床温度为 40°C 和印刷速度为 40 毫米/秒的条件下,共混物具有最理想的记忆性能。此外,还通过分子动力学模拟从分子层面研究了共混物的成分与其性能之间的关系,结果与实验观察结果一致。总之,这项研究为开发适用于 4D 打印应用的先进材料提供了新的视角。 亮点 共连续结构有效提高了共混物的机械性能。存储模量对形状记忆特性有主要影响。分子动力学模拟验证了实验观察结果。
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Preparation and characterization of 4D printable PCL/SEBS‐g‐MAH blends with excellent mechanical and shape memory properties
This work focuses on developing a novel thermal‐responsive shape memory Poly(ε‐caprolactone) (PCL)/maleic‐anhydride grafted poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] (SEBS‐g‐MAH) blends, with enhanced shape memory and mechanical properties, which is tailored for 3D printing applications. The thermal, mechanical, and rheological properties of the blends were rigorously assessed by DSC, TGA, mechanical testing, and dynamic rheological analysis. The results show that the elongation at the break of the blends exceeds 1000%, which can be attributed to the formation of the co‐continuous structure. Thermal‐responsive shape memory properties characterized by the water bath circulation method showed that the PCL4/MAH6 exhibited the optimal overall performance (shape fixation rate of 97.22%, shape recovery rate of 96.67%) and remained stable after 10 cycles of testing. Moreover, the effect of printing parameters on shape memory properties was investigated, revealing that blends perform the most promising memory behavior at a layer thickness of 0.1 mm, hot‐bed temperature of 40°C, and printing speed of 40 mm/s. In addition, the relationship between the composition of the blends and their properties was investigated at the molecular level by molecular dynamics simulations, which were in agreement with the experimental observations. In conclusion, this study provides new perspectives on the development of advanced materials suitable for 4D printing applications.Highlights The co‐continuous structure effectively enhances blends' mechanical properties. The storage modulus exerts a dominant influence on the shape memory properties. Molecular dynamics simulations are employed to validate experimental observations.
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来源期刊
Polymer Engineering and Science
Polymer Engineering and Science 工程技术-高分子科学
CiteScore
5.40
自引率
18.80%
发文量
329
审稿时长
3.7 months
期刊介绍: For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer science and technology. The importance of PE&S is underscored by the frequent rate at which its articles are cited, especially by other publications - literally thousand of times a year. Engineers, researchers, technicians, and academicians worldwide are looking to PE&S for the valuable information they need. There are special issues compiled by distinguished guest editors. These contain proceedings of symposia on such diverse topics as polyblends, mechanics of plastics and polymer welding.
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