The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
J. F. Gerard - One of the best experts on this subject based on the ideXlab platform.
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Study of a reactive epoxy-amine resin enabling in situ dissolution of thermoplastic films during resin transfer moulding for toughening composites
Composites Science and Technology, 2006Co-Authors: Mohammed Naffakh, Michel Dumon, J. F. GerardAbstract:A reactive solvent composed of an epoxy resin and a liquid amine hardener was used to dissolve thermoplastic films in situ and produce composites modified by Thermoplastics via resin transfer moulding (RTM). In order to overcome the high viscosity of the thermoplastic/resin solution, the thermoplastic, in the form of films, was placed between layers of fiber glass in the mould. It was intended that a thermoplastic/thermo set blend be generated in the interply regions after the following events had taken place: impregnation, dissolution of the films and a reaction induced phase separation of the thermoplastic (namely, polyether imide, PEI). Several diamine hardeners (cycloaliphatic and aromatic) were evaluated with regards to their reactivity and solubility. None of the cycloaliphatic amines tested were suitable. Only a liquid aromatic amine (diethyl toluene diamine) was found to satisfy both viscosity, miscibility and reactivity requirements for a RTM process. Finally, a first investigation into the blend morphology was carried out, this reveals dispersed PEI nodules between the fiber glass layers. This morphology may be compared to that observed in other thermoplastic/thermoset blends, i.e. "conventional" blends formed either from epoxy-amine/thermoplastic films (without glass fibers) or epoxy-amine/thermoplastic solutions at fixed concentration
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Study of a reactive epoxy-amine resin enabling in situ dissolution of thermoplastic films during resin transfer moulding for toughening composites
Composites Science and Technology, 2006Co-Authors: Mohammed Naffakh, Michel Dumon, J. F. GerardAbstract:A reactive solvent composed of an epoxy resin and a liquid amine hardener was used to dissolve thermoplastic films in situ and produce composites modified by Thermoplastics via resin transfer moulding (RTM). In order to overcome the high viscosity of the thermoplastic/resin solution, the thermoplastic, in the form of films, was placed between layers of fiber glass in the mould. It was intended that a thermoplastic/thermoset blend be generated in the interply regions after the following events had taken place: impregnation, dissolution of the films and a reaction induced phase separation of the thermoplastic (namely, polyether imide, PEI). Several diamine hardeners (cycloaliphatic and aromatic) were evaluated with regards to their reactivity and solubility. None of the cycloaliphatic amines tested were suitable. Only a liquid aromatic amine (diethyl toluene diamine) was found to satisfy both viscosity, miscibility and reactivity requirements for a RTM process. Finally, a first investigation into the blend morphology was carried out, this reveals dispersed PEI nodules between the fiber glass layers. This morphology may be compared to that observed in other thermoplastic/thermoset blends, i.e. "conventional" blends formed either from epoxy-amine/thermoplastic films (without glass fibers) or epoxy-amine/thermoplastic solutions at fixed concentration. © 2005 Elsevier Ltd. All rights reserved.
Mohammed Naffakh - One of the best experts on this subject based on the ideXlab platform.
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Study of a reactive epoxy-amine resin enabling in situ dissolution of thermoplastic films during resin transfer moulding for toughening composites
Composites Science and Technology, 2006Co-Authors: Mohammed Naffakh, Michel Dumon, J. F. GerardAbstract:A reactive solvent composed of an epoxy resin and a liquid amine hardener was used to dissolve thermoplastic films in situ and produce composites modified by Thermoplastics via resin transfer moulding (RTM). In order to overcome the high viscosity of the thermoplastic/resin solution, the thermoplastic, in the form of films, was placed between layers of fiber glass in the mould. It was intended that a thermoplastic/thermo set blend be generated in the interply regions after the following events had taken place: impregnation, dissolution of the films and a reaction induced phase separation of the thermoplastic (namely, polyether imide, PEI). Several diamine hardeners (cycloaliphatic and aromatic) were evaluated with regards to their reactivity and solubility. None of the cycloaliphatic amines tested were suitable. Only a liquid aromatic amine (diethyl toluene diamine) was found to satisfy both viscosity, miscibility and reactivity requirements for a RTM process. Finally, a first investigation into the blend morphology was carried out, this reveals dispersed PEI nodules between the fiber glass layers. This morphology may be compared to that observed in other thermoplastic/thermoset blends, i.e. "conventional" blends formed either from epoxy-amine/thermoplastic films (without glass fibers) or epoxy-amine/thermoplastic solutions at fixed concentration
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Study of a reactive epoxy-amine resin enabling in situ dissolution of thermoplastic films during resin transfer moulding for toughening composites
Composites Science and Technology, 2006Co-Authors: Mohammed Naffakh, Michel Dumon, J. F. GerardAbstract:A reactive solvent composed of an epoxy resin and a liquid amine hardener was used to dissolve thermoplastic films in situ and produce composites modified by Thermoplastics via resin transfer moulding (RTM). In order to overcome the high viscosity of the thermoplastic/resin solution, the thermoplastic, in the form of films, was placed between layers of fiber glass in the mould. It was intended that a thermoplastic/thermoset blend be generated in the interply regions after the following events had taken place: impregnation, dissolution of the films and a reaction induced phase separation of the thermoplastic (namely, polyether imide, PEI). Several diamine hardeners (cycloaliphatic and aromatic) were evaluated with regards to their reactivity and solubility. None of the cycloaliphatic amines tested were suitable. Only a liquid aromatic amine (diethyl toluene diamine) was found to satisfy both viscosity, miscibility and reactivity requirements for a RTM process. Finally, a first investigation into the blend morphology was carried out, this reveals dispersed PEI nodules between the fiber glass layers. This morphology may be compared to that observed in other thermoplastic/thermoset blends, i.e. "conventional" blends formed either from epoxy-amine/thermoplastic films (without glass fibers) or epoxy-amine/thermoplastic solutions at fixed concentration. © 2005 Elsevier Ltd. All rights reserved.
Michel Dumon - One of the best experts on this subject based on the ideXlab platform.
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Study of a reactive epoxy-amine resin enabling in situ dissolution of thermoplastic films during resin transfer moulding for toughening composites
Composites Science and Technology, 2006Co-Authors: Mohammed Naffakh, Michel Dumon, J. F. GerardAbstract:A reactive solvent composed of an epoxy resin and a liquid amine hardener was used to dissolve thermoplastic films in situ and produce composites modified by Thermoplastics via resin transfer moulding (RTM). In order to overcome the high viscosity of the thermoplastic/resin solution, the thermoplastic, in the form of films, was placed between layers of fiber glass in the mould. It was intended that a thermoplastic/thermo set blend be generated in the interply regions after the following events had taken place: impregnation, dissolution of the films and a reaction induced phase separation of the thermoplastic (namely, polyether imide, PEI). Several diamine hardeners (cycloaliphatic and aromatic) were evaluated with regards to their reactivity and solubility. None of the cycloaliphatic amines tested were suitable. Only a liquid aromatic amine (diethyl toluene diamine) was found to satisfy both viscosity, miscibility and reactivity requirements for a RTM process. Finally, a first investigation into the blend morphology was carried out, this reveals dispersed PEI nodules between the fiber glass layers. This morphology may be compared to that observed in other thermoplastic/thermoset blends, i.e. "conventional" blends formed either from epoxy-amine/thermoplastic films (without glass fibers) or epoxy-amine/thermoplastic solutions at fixed concentration
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Study of a reactive epoxy-amine resin enabling in situ dissolution of thermoplastic films during resin transfer moulding for toughening composites
Composites Science and Technology, 2006Co-Authors: Mohammed Naffakh, Michel Dumon, J. F. GerardAbstract:A reactive solvent composed of an epoxy resin and a liquid amine hardener was used to dissolve thermoplastic films in situ and produce composites modified by Thermoplastics via resin transfer moulding (RTM). In order to overcome the high viscosity of the thermoplastic/resin solution, the thermoplastic, in the form of films, was placed between layers of fiber glass in the mould. It was intended that a thermoplastic/thermoset blend be generated in the interply regions after the following events had taken place: impregnation, dissolution of the films and a reaction induced phase separation of the thermoplastic (namely, polyether imide, PEI). Several diamine hardeners (cycloaliphatic and aromatic) were evaluated with regards to their reactivity and solubility. None of the cycloaliphatic amines tested were suitable. Only a liquid aromatic amine (diethyl toluene diamine) was found to satisfy both viscosity, miscibility and reactivity requirements for a RTM process. Finally, a first investigation into the blend morphology was carried out, this reveals dispersed PEI nodules between the fiber glass layers. This morphology may be compared to that observed in other thermoplastic/thermoset blends, i.e. "conventional" blends formed either from epoxy-amine/thermoplastic films (without glass fibers) or epoxy-amine/thermoplastic solutions at fixed concentration. © 2005 Elsevier Ltd. All rights reserved.
Harald Erik Niklaus Bersee - One of the best experts on this subject based on the ideXlab platform.
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Reactive processing of textile fiber-reinforced thermoplastic composites - An overview
Composites Part A: Applied Science and Manufacturing, 2007Co-Authors: K. Van Rijswijk, Harald Erik Niklaus BerseeAbstract:Thermoplastic composites offer some interesting advantages over their thermoset counterparts like a higher toughness, faster manufacturing and their recyclable nature. Traditional melt processing, however, limits thermoplastic composite parts in size and thickness. As an alternative, reactive processing of textile fiber-reinforced Thermoplastics is discussed in this paper: a low viscosity mono- or oligomeric precursor is used to impregnate the fibers, followed by in situ polymerization. Processes that are currently associated to manufacturing of thermoset composites like resin transfer molding, vacuum infusion and resin film infusion, might be used for manufacturing of thermoplastic composite parts in near future. This paper gives an overview of engineering and high-performance plastic materials that are suitable for reactive processing and discusses fundamental differences between reactive processing of thermoplastic and thermoset resins. © 2006 Elsevier Ltd. All rights reserved.
R. Rudramoorthy - One of the best experts on this subject based on the ideXlab platform.
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modeling of temperature distribution in ultrasonic welding of Thermoplastics for various joint designs
Journal of Materials Processing Technology, 2007Co-Authors: K.s. Suresh, Roopa M Rani, Kalakkath Prakasan, R. RudramoorthyAbstract:Abstract Use of engineering plastics in structural and non-structural applications is rapidly increasing. As the demand for plastics increases so does the requirements for joining. Of the many techniques that are available for joining of Thermoplastics, ultrasonic welding is one of the preferred processes. Thermoplastic polymers are categorized according to their molecular structure as amorphous and semi-crystalline. Ultrasonic welding of these two types of Thermoplastics is expected to be quite different. As heating is confined to the interface area, quality of weld mainly depends on temperature at the interface. So study on temperature distribution during welding is very important to predict the quality of weld. Viscoelastic heating is most critical to ultrasonic welding of Thermoplastics because it is the main mechanism by which heat is developed at the interface. Heat developed due to viscoelastic heating depends on applied frequency, square of amplitude and loss modulus. In this study, modeling of temperature distribution for various joint designs of Thermoplastics as practised by industry is attempted and simulation is done in ANSYS. Model is validated by measurement of temperature during welding.
