{"title":"Curing rheokinetics of epoxy-amine composition","authors":"","doi":"10.1016/j.tca.2024.179825","DOIUrl":null,"url":null,"abstract":"<div><p>The article examines the curing of epoxy resin, based on diglycidyl ether Bisphenol-A, with the amine hardener Aramin (a mixture of aliphatic and aromatic amines). It was found that curing at 20, 40 and 60 °C is accompanied by microgelation. Coefficients of viscosity increase <span><math><msub><mi>k</mi><mi>η</mi></msub></math></span> rise by 2, 3 and 4 times respectively. The possibility of using second order equation, Kamal catalytic equation, auto-acceleration and auto-inhibition equations and describing the curing process was considered. It was shown that no one of the equations describes the entire process with a high degree of accuracy. Equations, which could adequately describe distinct stages of the process, have been found. The conditions (time and degree of conversion) for the onset of microgelation, gelation and transition from a kinetic to a diffusion-controlled mechanism were established.</p></div>","PeriodicalId":23058,"journal":{"name":"Thermochimica Acta","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thermochimica Acta","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0040603124001643","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The article examines the curing of epoxy resin, based on diglycidyl ether Bisphenol-A, with the amine hardener Aramin (a mixture of aliphatic and aromatic amines). It was found that curing at 20, 40 and 60 °C is accompanied by microgelation. Coefficients of viscosity increase rise by 2, 3 and 4 times respectively. The possibility of using second order equation, Kamal catalytic equation, auto-acceleration and auto-inhibition equations and describing the curing process was considered. It was shown that no one of the equations describes the entire process with a high degree of accuracy. Equations, which could adequately describe distinct stages of the process, have been found. The conditions (time and degree of conversion) for the onset of microgelation, gelation and transition from a kinetic to a diffusion-controlled mechanism were established.
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
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