当前位置：
X-MOL 学术
›
ACS Sustain. Chem. Eng.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Malleable, Recyclable, and Robust Poly(amide–imine) Vitrimers Prepared through a Green Polymerization Process
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-04-12 , DOI: 10.1021/acssuschemeng.1c00626 Kuan Liang 1 , Ganggang Zhang 1 , Jingbo Zhao 1 , Ling Shi 1 , Jue Cheng 1 , Junying Zhang 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-04-12 , DOI: 10.1021/acssuschemeng.1c00626 Kuan Liang 1 , Ganggang Zhang 1 , Jingbo Zhao 1 , Ling Shi 1 , Jue Cheng 1 , Junying Zhang 1
Affiliation
|
The introduction of dynamic covalent bonds into chemically cross-linked networks is an effective strategy to solve intrinsic problems of inability to be reprocessed or recycled for thermosetting polymers. Imine bonds (also known as Schiff bases) are promising candidates for constructing covalent adaptable networks (CANs) because of their easily triggered exchange reactions. However, it remains a challenge for polyimine vitrimers to improve the creep resistance and thermal stability due to their unstable imine-based networks. In this work, we report a green strategy to prepare a series of partially bio-based, malleable, recyclable, and robust poly(amide–imine) vitrimers by bulk polymerization for the first time. The amide bonds are introduced into polyimine vitrimers for the improvement of mechanical property, thermal stability, and creep resistance. A series of H2N-terminated prepolymers with tunable structures were first synthesized, which combined the amide and imine groups together. Then, a bio-based trimethyl citrate was selected as the curing agent to react with H2N-terminated prepolymers for the construction of CANs with amide bonds as cross-linking points. The imine groups accompanied by a dynamic exchange nature endowed the poly(amide–imine) vitrimers with reprocessability, self-healing property, and degradability. Meanwhile, the amide groups with inherent intermolecular hydrogen bonding enhanced the mechanical properties, thermal stability, and creep resistance of poly(amide–imine) thermosets.
中文翻译：
通过绿色聚合过程制备的可延展，可回收和耐用的聚（酰胺-亚胺）硫酸盐
将动态共价键引入化学交联网络是解决无法对热固性聚合物进行再加工或再循环的内在问题的有效策略。亚胺键（也称为席夫碱）是构建共价适应性网络（CAN）的有前途的候选者，因为它们容易触发交换反应。然而，由于聚亚胺三聚体不稳定的基于亚胺的网络，因此提高抗蠕变性和热稳定性仍然是一个挑战。在这项工作中，我们报告了一种绿色策略，这是首次通过本体聚合制备一系列部分基于生物的，可延展的，可回收的和坚固的聚（酰胺-亚胺）硫酸盐聚合物。将酰胺键引入聚亚胺三聚体中，以改善机械性能，热稳定性，和抗蠕变性。H系列首先合成了2种具有可调结构的N末端预聚物，将酰胺基和亚胺基结合在一起。然后，选择一种生物基柠檬酸三甲酯作为固化剂，使其与H 2 N端基预聚物反应，以构建以酰胺键为交联点的CAN。亚胺基团具有动态交换特性，赋予了聚酰胺（酰胺）亚胺三聚体以可再加工性，自修复性和可降解性。同时，具有固有分子间氢键键的酰胺基团增强了聚（酰胺－亚胺）热固性树脂的机械性能，热稳定性和抗蠕变性。
更新日期：2021-04-27
中文翻译：
通过绿色聚合过程制备的可延展，可回收和耐用的聚（酰胺-亚胺）硫酸盐
将动态共价键引入化学交联网络是解决无法对热固性聚合物进行再加工或再循环的内在问题的有效策略。亚胺键（也称为席夫碱）是构建共价适应性网络（CAN）的有前途的候选者，因为它们容易触发交换反应。然而，由于聚亚胺三聚体不稳定的基于亚胺的网络，因此提高抗蠕变性和热稳定性仍然是一个挑战。在这项工作中，我们报告了一种绿色策略，这是首次通过本体聚合制备一系列部分基于生物的，可延展的，可回收的和坚固的聚（酰胺-亚胺）硫酸盐聚合物。将酰胺键引入聚亚胺三聚体中，以改善机械性能，热稳定性，和抗蠕变性。H系列首先合成了2种具有可调结构的N末端预聚物，将酰胺基和亚胺基结合在一起。然后，选择一种生物基柠檬酸三甲酯作为固化剂，使其与H 2 N端基预聚物反应，以构建以酰胺键为交联点的CAN。亚胺基团具有动态交换特性，赋予了聚酰胺（酰胺）亚胺三聚体以可再加工性，自修复性和可降解性。同时，具有固有分子间氢键键的酰胺基团增强了聚（酰胺－亚胺）热固性树脂的机械性能，热稳定性和抗蠕变性。
京公网安备 11010802027423号