Synthesis and curing kinetics of O-aminoacetophenone-modified dicyandiamide curing agents for epoxy resin

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2025-02-20 DOI:10.1016/j.tca.2025.179963

Yuxin Yang , Chunhua Lou , Huixiao Wang , Jingjing Yu

引用次数: 0

Abstract

In this study, dicyandiamide (DCD) was modified with o-aminoacetophenone to synthesize a new curing agent for epoxy resin (EP), called o-acetylphenylguanidine (o-APG). The experimental results showed that the yield of o-APG could reach 85.79 % under the optimal ratio. The structure of o-APG was characterized via Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction analysis, and nuclear magnetic resonance spectroscopy. The result deduced that the compatibility of o-APG with EP was significantly improved because CN reacted to form the CNH group. The curing kinetics of the reaction of EP cured with o-APG was investigated via differential scanning calorimetry (DSC) by using the methods of Kissinger, Ozawa, Starink, and Friedman. The DSC analysis result showed that curing temperature was reduced by about 50 °C compared with the DCD-cured EP.

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邻氨基苯乙酮改性双氰胺环氧树脂固化剂的合成及固化动力学研究

本研究用邻氨基苯乙酮对双氰胺（DCD）进行改性，合成了一种新型环氧树脂（EP）固化剂——邻乙酰苯基胍（o-APG）。实验结果表明，在最佳配比下，o-APG的收率可达85.79%。通过傅里叶变换红外光谱、x射线光电子能谱、x射线衍射分析和核磁共振谱对o-APG的结构进行了表征。结果表明，由于CN反应形成CNH基团，o-APG与EP的相容性显著提高。采用Kissinger、Ozawa、Starink和Friedman方法，通过差示扫描量热法（DSC）研究了EP与o-APG固化反应的固化动力学。DSC分析结果表明，与cd固化的EP相比，固化温度降低了约50℃。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes