3D-printable vitrimers processed by digital light processing (DLP) have been recently developed, based on the transesterification reaction of β-hydroxyester structures from mono- and diacrylate monomers employed in the formulation. These materials show promising repairability and recyclability, in addition to other interesting features such as shape memory and shape reconfigurability. It has been reported that structural changes taking place due to transesterification promote network rearrangement and an enhancement of the thermomechanical properties. However, the elevated temperatures required for the network reconfiguration cast some doubts on their applicability in real-life scenarios. In this paper, we analyze the effect of the thermal treatment on the thermomechanical properties and relaxation behavior of these materials and discuss the underlying mechanism explaining the observed changes. We identify some critical issues related to use of a monoacrylate containing β-hydroxyester moieties, and propose solutions to overcome the most relevant drawbacks. © 2023 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.

中文翻译：

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基于数字光处理的 3D 打印应用酯交换 Vitrimer 热稳定性的批判性分析

最近，基于配方中使用的单丙烯酸酯和二丙烯酸酯单体的β-羟基酯结构的酯交换反应，开发了通过数字光处理 (DLP) 加工的 3D 打印 vitrimer 。除了形状记忆和形状可重构性等其他有趣的功能外，这些材料还表现出良好的可修复性和可回收性。据报道，由于酯交换反应而发生的结构变化促进了网络重排和热机械性能的增强。然而，网络重新配置所需的高温使人们对其在现实生活场景中的适用性产生了一些疑问。在本文中，我们分析了热处理对这些材料的热机械性能和松弛行为的影响，并讨论了解释观察到的变化的潜在机制。我们确定了与使用含有β-羟基酯部分的单丙烯酸酯相关的一些关键问题，并提出了克服最相关缺点的解决方案。© 2023 作者。《Polymer International》由 John Wiley & Sons Ltd 代表工业化学学会出版。