Entropy-driven segregation in epoxy-amine systems at a copper interface

Soft Matter ◽  
2021 ◽  
Author(s):  
Satoru Yamamoto ◽  
Keiji Tanaka
Keyword(s):  
Curing Process ◽  
Epoxy Amine

Smaller molecules were preferentially segregated at the interface regardless of the epoxy and amine, and this segregation remained after the curing process.

scholarly journals Cure Kinetics and Inverse Analysis of Epoxy-Amine Based Adhesive Used for Fastening Systems

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3853
Author(s):  
Bilen Emek Abali ◽  
Michele Zecchini ◽  
Gilda Daissè ◽  
Ivana Czabany ◽  
Wolfgang Gindl-Altmutter ◽  
...  
Keyword(s):  
Inverse Analysis ◽  
Building Materials ◽  
Cure Kinetics ◽  
Accurate Estimation ◽  
Curing Process ◽  
Degree Of Cure ◽  
Material Parameters ◽  
Epoxy Amine ◽  
Thermosetting Polymers ◽  
Material Equation

Thermosetting polymers are used in building materials, for example adhesives in fastening systems. They harden in environmental conditions with a daily temperature depending on the season and location. This curing process takes hours or even days effected by the relatively low ambient temperature necessary for a fast and complete curing. As material properties depend on the degree of cure, its accurate estimation is of paramount interest and the main objective in this work. Thus, we develop an approach for modeling the curing process for epoxy based thermosetting polymers. Specifically, we perform experiments and demonstrate an inverse analysis for determining parameters in the curing model. By using calorimetry measurements and implementing an inverse analysis algorithm by using open-source packages, we obtain 10 material parameters describing the curing process. We present the methodology for two commercial, epoxy based products, where a statistical analysis provides independence of material parameters leading to the conclusion that the material equation is adequately describing the material response.

Mesoscopic Heterogeneity in the Curing Process of an Epoxy–Amine System

2019 ◽  
Vol 52 (5) ◽  
pp. 2075-2082 ◽  
Author(s):  
Mika Aoki ◽  
Atsuomi Shundo ◽  
Riichi Kuwahara ◽  
Satoru Yamamoto ◽  
Keiji Tanaka
Keyword(s):  
Curing Process ◽  
Epoxy Amine ◽  
Amine System

Effect of epoxy monomer structure on the curing process and thermo-mechanical characteristics of tri-functional epoxy/amine systems: a methodology combining atomistic molecular simulation with experimental analyses

2017 ◽  
Vol 8 (13) ◽  
pp. 2016-2027 ◽  
Author(s):  
Liang Gao ◽  
Qingjie Zhang ◽  
Hao Li ◽  
Siruo Yu ◽  
Weihong Zhong ◽  
...  
Keyword(s):  
Molecular Simulation ◽  
Experimental Research ◽  
Mechanical Characteristics ◽  
Curing Process ◽  
Epoxy Amine ◽  
Monomer Structure ◽  
System P ◽  
Epoxy Monomer ◽  
Amine System ◽  
Experimental Analyses

A methodology, which combined molecular simulation with experimental research, was established to expound the performance of a tri-functional epoxy/amine system.

scholarly journals The influence of montmorillonite content on the kinetics of curing of epoxy nanocomposites

2012 ◽  
Vol 66 (6) ◽  
pp. 863-870
Author(s):  
Mirjana Jovicic ◽  
Oskar Bera ◽  
Jelena Pavlicevic ◽  
Vesna Simendic ◽  
Radmila Radicevic
Keyword(s):  
Isoconversional Methods ◽  
Curing Process ◽  
Heating Rates ◽  
Epoxy Nanocomposites ◽  
Scanning Calorimetry ◽  
Epoxy Amine ◽  
Friedman Method ◽  
Kinetics Of ◽  
Dsc Curves ◽  
Energy Activation

In this work, the attention was paid at the investigation of montmorillonite dispersion in epoxy/amine systems due to improved final properties of the nanocomposites. The influence of different montmorillonite content on the kinetics of curing of epoxy/Jeffamine D-230 systems was followed by differential scanning calorimetry (DSC). The curing of epoxy nanocomposites was performed using dynamic regime at three different heating rates: 5, 10 and 20?C/min. Three isoconversional methods were applied: two integral (Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose methods) and one differential (Friedman method). The presence of montmorillonite (MMT) causes the beginning of curing at lower temperatures. The shape of the DSC curves has been changed by the addition of MMT, supporting the hypothesis of a change in the reaction mechanism. For hybrids with 3 and 5 wt.% of MMT, the E? dependence is very similar to those found for the reference system (epoxy/Jeffamine D-230) for the curing degree less than 60%. The hybrid with 10 wt.% of MMT has lower energy activation in regard to the referent system without montmorillonite. Greater differences are observed in the second part of the reaction, where it is known that the curing process is more controlled by diffusion (?>0.60). The Ea value increases at the end of the reaction (??1), which was observed for all systems, and is more pronounced in the presence of montmorillonite.

scholarly journals New Epoxy Thermosets Derived from Clove Oil Prepared by Epoxy-Amine Curing

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 44 ◽  
Author(s):  
David Santiago ◽  
Dailyn Guzmán ◽  
Xavier Ramis ◽  
Francesc Ferrando ◽  
Àngels Serra
Keyword(s):  
Renewable Resources ◽  
Crosslinking Density ◽  
Curing Process ◽  
Scanning Calorimetry ◽  
Compact Structure ◽  
Good Thermal Stability ◽  
Epoxy Amine ◽  
Epoxy Monomer ◽  
Amine Curing ◽  
Crosslinking Agents

New thermosets from a triglycidyl eugenol derivative (3EPOEU) as a renewable epoxy monomer were obtained by an epoxy-amine curing process. A commercially-available Jeffamine® and isophorone diamine, both obtained from renewable resources, were used as crosslinking agents, and the materials obtained were compared with those obtained from a standard diglycidylether of bisphenol A (DGEBA). The evolution of the curing process was studied by differential scanning calorimetry and the materials obtained were characterized by means of calorimetry, thermogravimetry, thermodynamomechanical analysis, stress–strain tests and microindentation. 3EPOEU formulations were slightly less reactive, and the thermosets obtained showed higher Tgs than those prepared from DGEBA, since they had higher crosslinking density than formulations with DGEBA because of the more compact structure and higher functionality of the eugenol derivative. 3EPOEU thermosets showed good thermal stability and mechanical properties. The results obtained in this study allow us to conclude that the triglycidyl derivative of eugenol, 3EPOEU, is a safe and environmentally friendly alternative to DGEBA.

scholarly journals The Curing Rheokinetics of Epoxyphosphazene Binders

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5685
Author(s):  
Natalia V. Bornosuz ◽  
Irina Yu. Gorbunova ◽  
Vyacheslav V. Kireev ◽  
Denis V. Onuchin ◽  
Mikhail L. Kerber ◽  
...  
Keyword(s):  
Molecular Mass ◽  
Network Formation ◽  
High Density ◽  
Curing Process ◽  
Mass Growth ◽  
Modifying Additives ◽  
Rotational Viscometry ◽  
Epoxy Amine ◽  
Linear Chains ◽  
Viscosity Increase

The influence of epoxyphosphazene-modifying additives on the features of the hot curing process of epoxy-amine composition was studied by the rotational viscometry method. The modification caused an acceleration of the curing process, changed rheokinetics of viscosity increase, especially the stage molecular mass growth of linear chains became almost twice shorter for composition with 30% modifier than for unmodified one. We suggest the reason for these changes is the polyfunctionality of epoxyphosphazene, which finally results in high-density network formation. In cold curing process the bulkiness of epoxyphosphazene molecule and the lack of heat for its motion results in incomplete cure. Thus, in order to cope with these difficulties hot curing systems were proposed and studied.

Research of the effect of bacterial preparation "LRR" on the functional and technological parameters of meat during curing process

2018 ◽  
Vol 6 (11) ◽  
pp. 41-47
Author(s):  
Liubov Voytsekhivska ◽  
◽  
Larysa Borsolyuk ◽  
Tetiana Schelkova ◽  
Anna Gavrylenko ◽  
...  
Keyword(s):  
Curing Process ◽  
Technological Parameters ◽  
Bacterial Preparation

Radiotechnical hot pressed glass fiber plastics for ship aerial fairings and antennas protection in radio connection and radio location systems

2019 ◽  
pp. 143-158
Author(s):  
V. E. Bakhareva ◽  
I. V. Nikitina ◽  
A. A. Churikova
Keyword(s):  
Glass Fiber ◽  
Silica Glass ◽  
High Strength ◽  
Scientific Problem ◽  
Epoxy Amine ◽  
Dielectric Glass ◽  
Radio Location ◽  
Location Systems

The article is devoted to the urgent scientific problem of creation and introduction in shipbuilding of high-strength, water-resistant dielectric glass-reinforced hot pressed plastics on the basis of bi- and polyfunctional epoxy-amine binders and glass fabrics from alkali, quartz and silica glass.

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