当前位置：
X-MOL 学术
›
J. Appl. Polym. Sci.
›
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.)
Using epoxy/acid stoichiometry to rationally tune the thermomechanical and reprocessing properties of epoxy vitrimers
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-09-21 , DOI: 10.1002/app.54699 Jie Sheng 1, 2 , Tie Geng 1 , Lin Jiang 1, 2 , Haihong Wu 2 , Jiquan Li 3 , Zhengqiang Huang 4 , Jing You 5 , Yonggang Guo 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-09-21 , DOI: 10.1002/app.54699 Jie Sheng 1, 2 , Tie Geng 1 , Lin Jiang 1, 2 , Haihong Wu 2 , Jiquan Li 3 , Zhengqiang Huang 4 , Jing You 5 , Yonggang Guo 1
Affiliation
|
Epoxy vitrimers immerged as an appealing alternative to traditional plastics. However, high loading of catalyst and harsh processing conditions are prerequisites to fully exploit the vitrimer properties. In this work, stoichiometric ratio, an often neglected factor, was utilized to further accelerate the rate of dynamic transesterification. Epoxy vitrimers with four epoxy/acid stoichiometries (60:30, 40:30, 30:30, and 24:30) were prepared to comparatively analyze their network structures, thermomechanical properties, and reprocessing properties. It was found that the off-stoichiometry epoxy vitrimers have almost the similar excellent thermal stability as epoxy thermosets. Vitrimers with excess epoxy showed increased tensile strength (from 26.3 to 42.7 MPa) and decreased elongation at the break (from 5.5% to 1.7%). Meanwhile, excess epoxy induced abundant of hydroxy groups in the vitrimers, imparting satisfactory repairability, reformability, and recyclability. Specifically, epoxy/acid (60:30) repaired 94% in 10 min at 180°C, and maintained over 93% mechanical properties after reforming and recycling. However, simply increasing the epoxy content will compromise the structural integrity of the network, simultaneously resulting in reduced toughness of epoxy vitrimers. These findings demonstrated that epoxy/acid stoichiometry can be a powerful tool to develop epoxy vitrimers with both excellent thermomechanical and reprocessing properties.
中文翻译：
利用环氧/酸化学计量合理调节环氧玻璃体的热机械和再加工性能
环氧玻璃体作为传统塑料的有吸引力的替代品而被浸入水中。然而，催化剂的高负载量和苛刻的加工条件是充分利用vitrimer特性的先决条件。在这项工作中，利用经常被忽视的化学计量比来进一步加快动态酯交换反应的速率。制备了具有四种环氧/酸化学计量（60:30、40:30、30:30和24:30）的环氧玻璃体，以比较分析它们的网络结构、热机械性能和再加工性能。研究发现，非化学计量环氧玻璃体具有与环氧热固性材料几乎相似的优异热稳定性。含有过量环氧树脂的 Vitrimers 显示出拉伸强度增加（从 26.3 MPa 至 42.7 MPa），断裂伸长率降低（从 5.5% 至 1.7%）。同时，过量的环氧基在玻璃体中诱导出丰富的羟基，从而赋予令人满意的可修复性、可重整性和可回收性。具体来说，环氧树脂/酸（60:30）在180°C下10分钟内修复94%，并在重整和回收后保持93%以上的机械性能。然而，简单地增加环氧含量会损害网络的结构完整性，同时导致环氧玻璃体的韧性降低。这些发现表明，环氧/酸化学计量可以成为开发具有优异热机械和再加工性能的环氧玻璃体的有力工具。
更新日期：2023-09-21
中文翻译：
利用环氧/酸化学计量合理调节环氧玻璃体的热机械和再加工性能
环氧玻璃体作为传统塑料的有吸引力的替代品而被浸入水中。然而，催化剂的高负载量和苛刻的加工条件是充分利用vitrimer特性的先决条件。在这项工作中，利用经常被忽视的化学计量比来进一步加快动态酯交换反应的速率。制备了具有四种环氧/酸化学计量（60:30、40:30、30:30和24:30）的环氧玻璃体，以比较分析它们的网络结构、热机械性能和再加工性能。研究发现，非化学计量环氧玻璃体具有与环氧热固性材料几乎相似的优异热稳定性。含有过量环氧树脂的 Vitrimers 显示出拉伸强度增加（从 26.3 MPa 至 42.7 MPa），断裂伸长率降低（从 5.5% 至 1.7%）。同时，过量的环氧基在玻璃体中诱导出丰富的羟基，从而赋予令人满意的可修复性、可重整性和可回收性。具体来说，环氧树脂/酸（60:30）在180°C下10分钟内修复94%，并在重整和回收后保持93%以上的机械性能。然而，简单地增加环氧含量会损害网络的结构完整性，同时导致环氧玻璃体的韧性降低。这些发现表明，环氧/酸化学计量可以成为开发具有优异热机械和再加工性能的环氧玻璃体的有力工具。
京公网安备 11010802027423号