Solvent-Free Upcycling Vitrimers through Digital Light Processing-Based 3D Printing and Bond Exchange Reaction
Solvent-Free Upcycling Vitrimers through Digital Light Processing-Based 3D Printing and Bond Exchange Reaction
复制标题
通过数字光处理基于 3D 打印和键交换反应的无溶剂 Vitrimers 升级回收
DOI：
10.1002/adfm.202111030
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发表时间：
2022-03-30
影响因子：
19
通讯作者：
Ge, Qi
中科院分区：
文献类型：
--
作者：
Li, Honggeng;Zhang, Biao;Ge, Qi
玻璃体是一种动态交联聚合物，它将热固性树脂的耐溶剂性和耐热性与热塑性塑料的可再加工性结合在一起，为塑料污染问题提供了一种新的解决方案。然而，目前回收玻璃剂的方法很大程度上限制了回收玻璃剂的形状为简单的几何形状，从而大大限制了回收玻璃剂的应用范围。在这里，报道了一种简单而通用的回收废玻璃的方法，即开发一种紫外光固化回收(UVR)溶液系统。传统的不能打印的玻璃粉可以与UVR溶液混合，得到的混合物与基于数字光处理的3D打印兼容，以制造高分辨率(高达20微米)和高几何复杂性的3D结构。热处理在印刷结构中引发键交换反应，大大提高了机械性能。这种方法允许循环打印玻璃剂废料多次。此外，UVR-玻璃体混合溶液可以作为粘合剂将打印的小部件粘合在一起，构建更大、更复杂的结构，而不是打印。这项工作报告的升级方法扩大了回收玻璃剂的应用范围，并提供了一种实用的解决方案，以应对与塑料污染相关的环境挑战。
Vitrimers, a type of dynamically crosslinked polymers that combine the solvent- and heat-resistance of thermosets with the reprocessability of thermoplastics, offer a new solution to the problem of plastic pollution. However, the current recycling approaches of vitrimers greatly constrain the shapes of recycled vitrimers to simple geometries, thus significantly limiting the application scopes of recycled vitrimers. Here, a simple but universal method for upcycling vitrimer wastes is reported by developing a UV curable recycling (UVR) solution system. Conventional unprintable vitrimer powders can be mixed with the UVR solution, and the resulting mixture is compatible with digital light processing based 3D printing to fabricate 3D structures with high resolution (up to 20 mu m) and high geometric complexity. Heat treatment triggers bond exchange reactions in the printed structures, and greatly enhances the mechanical properties. This method allows to cyclically print vitrimer wastes multiple times. Moreover, the UVR-vitrimer mixture solution can work as an adhesive to bond printed small parts together to build a larger and more complex structure which cannot be printed. The upcycling method reported in this work extends the application scope of recycled vitrimers and provide a practical solution to address environmental challenges associated with plastic pollution.