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环氧/酸计量比对环氧热固性塑料固化行为和力学性能的影响。

Influence of the Epoxy/Acid Stoichiometry on the Cure Behavior and Mechanical Properties of Epoxy Vitrimers.

机构信息

MOE Key Laboratory of High Performance Polymer Materials and Technology, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.

Department of Chemistry, Texas A&M University, College Station, TX 77843, USA.

出版信息

Molecules. 2022 Sep 26;27(19):6335. doi: 10.3390/molecules27196335.

DOI:10.3390/molecules27196335
PMID:36234872
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9571190/
Abstract

Bisphenol A epoxy resin cured with a mixture of dimerized and trimerized fatty acids is the first epoxy vitrimer and has been extensively studied. However, the cure behavior and thermal and mechanical properties of this epoxy vitrimer depend on the epoxy/acid stoichiometry. To address these issues, epoxy vitrimers with three epoxy/acid stoichiometries (9:11, 1:1 and 11:9) were prepared and recycled four times. Differential scanning calorimetry (DSC) was used to study the cure behavior of the original epoxy vitrimers. The dynamic mechanical properties and mechanical performance of the original and recycled epoxy vitrimers were investigated by using dynamic mechanical analysis (DMA) and a universal testing machine. Furthermore, the reaction mechanism of epoxy vitrimer with different epoxy/acid stoichiometry was interpreted. With an increase in the epoxy/acid ratio, the reaction rate, swelling ratio, glass transition temperature and mechanical properties of the original epoxy vitrimers decreased, whereas the gel content increased. The recycling decreased the swelling ratio and elongation at break of the original epoxy vitrimers. Moreover, the elongation at break of the recycled epoxy vitrimers decreased with the epoxy/acid ratio at the same recycling time. However, the gel content, tensile strength and toughness of the original epoxy vitrimers increased after the recycling. The mechanical properties of epoxy vitrimers can be tuned with the variation in the epoxy/acid stoichiometry.

摘要

双酚 A 环氧树脂与二聚酸和三聚酸混合物固化得到的第一个环氧型热塑弹性体已得到广泛研究。然而，这种环氧型热塑弹性体的固化行为、热性能和力学性能取决于环氧树脂/酸的化学计量比。为了解决这些问题，制备了三种不同环氧树脂/酸化学计量比（9:11、1:1 和 11:9）的环氧型热塑弹性体，并进行了四次回收利用。采用差示扫描量热法（DSC）研究了原始环氧型热塑弹性体的固化行为。通过动态力学分析（DMA）和万能试验机研究了原始和回收环氧型热塑弹性体的动态力学性能和力学性能。此外，还解释了不同环氧树脂/酸化学计量比的环氧型热塑弹性体的反应机理。随着环氧树脂/酸比例的增加，原始环氧型热塑弹性体的反应速率、溶胀比、玻璃化转变温度和力学性能降低，而凝胶含量增加。回收利用降低了原始环氧型热塑弹性体的溶胀比和断裂伸长率。此外，在相同的回收时间内，回收环氧型热塑弹性体的断裂伸长率随环氧树脂/酸比例的增加而降低。然而，回收后原始环氧型热塑弹性体的凝胶含量、拉伸强度和韧性增加。通过改变环氧树脂/酸的化学计量比，可以调整环氧型热塑弹性体的力学性能。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f49e/9571190/3517f318d81a/molecules-27-06335-g014.jpg
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