Synthesis of reaction promoters for epoxy polymerization: Enhancing storage stability and mechanical properties of one-pot epoxy systems

IF 2.7 3区化学 Q2 POLYMER SCIENCE

Journal of Applied Polymer Science Pub Date : 2024-10-22 DOI:10.1002/app.56265

Da Young Lee, Hye-Jin Kim, Hyeon-Gook Kim, Meysam Tayebi, Jong-Hyun Kim, Seoyoon Yu, Ildoo Chung, Choong-Sun Lim, Bongkuk Seo

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Abstract

One-pot epoxy formulations, containing uncured resin, curing agent, and promoter, require the promoter to be insoluble in the resin at room temperature to prevent premature polymerization. Here, we introduce three novel reaction promoters synthesized by reacting amino propyl imidazole (API) and various diisocyanates such as HMDI, IPDI, or MDI. We evaluate the impact of these promoters on the physical properties, storage stability, and curing kinetics of the resulting epoxy formulations. The results of the kinetic study showed that the compositions containing each synthesized promoter acted as reaction promoters, as evidenced by the lower activation energy in the differential scanning calorimetry (DSC) experiment. The results of the mechanical properties showed that HMDI-API promoter improved both tensile and flexural strength, while exhibiting high storage stability. The findings provide valuable insights for selecting suitable promoters for specific applications in one-pot epoxy systems.

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环氧聚合反应促进剂的合成：提高一锅环氧体系的储存稳定性和机械性能

含有未固化树脂、固化剂和促进剂的单锅环氧配方要求促进剂在室温下不溶于树脂，以防止过早聚合。在此，我们介绍了通过氨基丙基咪唑（API）和各种二异氰酸酯（如 HMDI、IPDI 或 MDI）反应合成的三种新型反应促进剂。我们评估了这些促进剂对所得环氧配方的物理性质、储存稳定性和固化动力学的影响。动力学研究结果表明，含有每种合成促进剂的组合物都起到了反应促进剂的作用，这从差示扫描量热仪（DSC）实验中较低的活化能可以得到证明。机械性能结果表明，HMDI-API 促进剂提高了拉伸和弯曲强度，同时表现出较高的储存稳定性。这些发现为在一锅环氧体系中选择适合特定应用的促进剂提供了宝贵的见解。

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来源期刊

Journal of Applied Polymer Science 化学-高分子科学

CiteScore

5.70

自引率

10.00%

发文量

1280

审稿时长

2.7 months

期刊介绍： The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.