Preparation of environmentally friendly bio-based vitrimers from vanillin derivatives by introducing two types of dynamic covalent C=N and S-S bonds
Preparation of environmentally friendly bio-based vitrimers from vanillin derivatives by introducing two types of dynamic covalent C=N and S-S bonds
复制标题
引入两种动态共价C=N和S-S键从香兰素衍生物制备环保型生物基玻璃体
DOI：
10.1016/j.polymer.2020.122483
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发表时间：
2020-05-27
期刊：
影响因子：
4.6
通讯作者：
Zhang, Qiuyu
中科院分区：
文献类型：
--
作者：
Guo, Zijian;Liu, Bangjie;Zhang, Qiuyu
本研究以香兰素衍生的双醛和胺单体为原料，合成了一种新型的具有多个可逆共价键的自愈性、可化学降解和可回收的香兰素玻璃体(VFX)。为了提高力学性能和缩短松弛时间，我们在聚希夫玻璃中引入了二硫键。其中，含10mol%二硫键的VF10具有最好的力学性能(T-g=43℃，拉伸强度=16.68 Mpa)，并且经过两次热压后力学性能保持不变。更重要的是，VFX可以在盐酸溶液(pH=2)中被降解，并可以循环使用来制备薄膜。这些可再加工性、可回收性和生物基单体的特性为满足可持续发展的要求提供了一条可行的途径，对资源的回收利用具有重要意义。
In this study, a novel self-healing, chemically degradable and recyclable vanillin vitrimers (VFx) containing multiple reversible covalent bonds were prepared from vanillin-derived dialdehyde and amine monomers. In order to improve mechanical properties and shorten the relaxation time, we introduced disulfide bonds into the polyschiff vitrimers. Among these VFx, VF10 containing 10 mol % disulfide bonds exhibited the best mechanical properties (T-g = 43 degrees C, tensile strength = 16.68 MPa), and the mechanical properties were sustained after two cycles of hot pressing. More significantly, VFx could be degraded in hydrochloric solution (pH = 2) and recycled to prepare the films. These characteristics of reprocessability, recyclability and bio-based monomer present a feasible way to satisfy the demands of sustainability, which is of great significance for the recycling of resources.