Layered silicate nanocomposites based on various high‐functionality epoxy resins. Part II: The influence of an organoclay on the rheological behavior of epoxy prepolymers
Identifieur interne : 00AF13 ( Main/Exploration ); précédent : 00AF12; suivant : 00AF14Layered silicate nanocomposites based on various high‐functionality epoxy resins. Part II: The influence of an organoclay on the rheological behavior of epoxy prepolymers
Auteurs : Ole Becker [Australie] ; Peter Sopade [Australie] ; Romain Bourdonnay [France] ; Peter J. Halley [Australie] ; George P. Simon [Australie]Source :
- Polymer Engineering & Science [ 0032-3888 ] ; 2003-10.
Descripteurs français
- Pascal (Inist)
- Argile organique, Calcium Carbonate, Charge lamellaire, Effet concentration, Effet structure, Effet température, Epoxyde résine, Etude comparative, Etude expérimentale, Interaction matière charge monomère, Matériau composite, Matériau renforcé dispersion, Monomère, Montmorillonite, Nanocomposite, Viscosité cisaillement.
- Wicri :
- topic : Matériau composite, Polymère, Résine.
English descriptors
- KwdEn :
- Activation energy, Calcium Carbonates, Calcium carbonate, Clay concentration, Comparative study, Composite material, Concentration effect, Dgeba, Different resin systems, Dispersion reinforced material, Dynamic measurements, Dynamic tgddm, Epoxy, Epoxy prepolymers, Epoxy resin, Epoxy resins, Experimental study, Frequency sweeps, Good agreement, Higher organoclay concentrations, Interlayer distance, Loss modulus, Monomer, Montmorillonite, Nanocomposite, Nanocomposites, Newtonian behavior, Newtonian flow behavior, October, Organic clay, Organoclay, Organoclay concentrations, Platelet, Polymer, Polymer engineering, Processing conditions, Resin, Resin systems, Rheological behavior, Rheology, Romain bourdonnay, Shear rate, Shear viscosity, Silicate, Silicate blends, Silicate concentrations, Silicate platelets, Steady shear measurements, Stress parameter, Structure effect, Temperature effect, Tgap, Tgddm, Viscoelastic region, Viscoelastic response, Viscosity values.
- Teeft :
- Activation energy, Calcium carbonate, Clay concentration, Dgeba, Different resin systems, Dynamic measurements, Dynamic tgddm, Epoxy, Epoxy prepolymers, Epoxy resin, Epoxy resins, Frequency sweeps, Good agreement, Higher organoclay concentrations, Interlayer distance, Loss modulus, Monomer, Nanocomposites, Newtonian behavior, Newtonian flow behavior, October, Organoclay, Organoclay concentrations, Platelet, Polymer, Polymer engineering, Processing conditions, Resin, Resin systems, Rheological behavior, Rheology, Romain bourdonnay, Shear rate, Silicate, Silicate blends, Silicate concentrations, Silicate platelets, Steady shear measurements, Stress parameter, Tgap, Tgddm, Viscoelastic region, Viscoelastic response, Viscosity values.
Abstract
The effect of an organically surface modified layered silicate on the viscosity of various epoxy resins of different structures and different functionalities was investigated. Steady and dynamic shear viscosities of the epoxy resins containing 0–10 Wt% of the organoclay were determined using parallel plate rheology. Viscosity results were compared with those achieved through addition of a commonly used micronsized CaCO3 filler. It was found that changes in viscosities due to the different fillers were of the same order, since the layered silicate was only dispersed on a micron‐sized scale in the monomer (prior to reaction), as indicated by X‐ray diffraction measurements. Flow activation energies at a low frequency were determined and did not show any significant changes due to the addition of organoclay or CaCO3. Comparison between dynamic and steady shear experiments showed good agreement for low layered silicate concentrations below 7.5 wt%, i.e. the Cox‐Merz rule can be applied. Deviations from the Cox‐Merz rule appeared at and above 10 wt%, although such deviations were only slightly above experimental error. Most resin organoclay blends were well predicted by the Power Law model, only concentrations of 10 wt% and above requiring the Herschel‐Buckley (yield stress) model to achieve better fits. Wide‐angle X‐ray measurements have shown that the epoxy resin swells the layered silicate with an increase in the interlayer distance of approximately 15 Å, and that the rheology behavior is due to the lateral, micron‐size of these swollen tactoids.
Url:
DOI: 10.1002/pen.10142
Affiliations:
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modulus</term><term>Monomer</term><term>Montmorillonite</term><term>Nanocomposite</term><term>Nanocomposites</term><term>Newtonian behavior</term><term>Newtonian flow behavior</term><term>October</term><term>Organic clay</term><term>Organoclay</term><term>Organoclay concentrations</term><term>Platelet</term><term>Polymer</term><term>Polymer engineering</term><term>Processing conditions</term><term>Resin</term><term>Resin systems</term><term>Rheological behavior</term><term>Rheology</term><term>Romain bourdonnay</term><term>Shear rate</term><term>Shear viscosity</term><term>Silicate</term><term>Silicate blends</term><term>Silicate concentrations</term><term>Silicate platelets</term><term>Steady shear measurements</term><term>Stress parameter</term><term>Structure effect</term><term>Temperature effect</term><term>Tgap</term><term>Tgddm</term><term>Viscoelastic region</term><term>Viscoelastic response</term><term>Viscosity values</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Argile organique</term><term>Calcium Carbonate</term><term>Charge lamellaire</term><term>Effet concentration</term><term>Effet structure</term><term>Effet température</term><term>Epoxyde résine</term><term>Etude comparative</term><term>Etude expérimentale</term><term>Interaction matière charge monomère</term><term>Matériau composite</term><term>Matériau renforcé dispersion</term><term>Monomère</term><term>Montmorillonite</term><term>Nanocomposite</term><term>Viscosité cisaillement</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Activation energy</term><term>Calcium carbonate</term><term>Clay concentration</term><term>Dgeba</term><term>Different resin systems</term><term>Dynamic measurements</term><term>Dynamic tgddm</term><term>Epoxy</term><term>Epoxy prepolymers</term><term>Epoxy resin</term><term>Epoxy resins</term><term>Frequency sweeps</term><term>Good agreement</term><term>Higher organoclay concentrations</term><term>Interlayer distance</term><term>Loss modulus</term><term>Monomer</term><term>Nanocomposites</term><term>Newtonian behavior</term><term>Newtonian flow behavior</term><term>October</term><term>Organoclay</term><term>Organoclay concentrations</term><term>Platelet</term><term>Polymer</term><term>Polymer engineering</term><term>Processing conditions</term><term>Resin</term><term>Resin systems</term><term>Rheological behavior</term><term>Rheology</term><term>Romain bourdonnay</term><term>Shear rate</term><term>Silicate</term><term>Silicate blends</term><term>Silicate concentrations</term><term>Silicate platelets</term><term>Steady shear measurements</term><term>Stress parameter</term><term>Tgap</term><term>Tgddm</term><term>Viscoelastic region</term><term>Viscoelastic response</term><term>Viscosity values</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Matériau composite</term><term>Polymère</term><term>Résine</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The effect of an organically surface modified layered silicate on the viscosity of various epoxy resins of different structures and different functionalities was investigated. Steady and dynamic shear viscosities of the epoxy resins containing 0–10 Wt% of the organoclay were determined using parallel plate rheology. Viscosity results were compared with those achieved through addition of a commonly used micronsized CaCO3 filler. It was found that changes in viscosities due to the different fillers were of the same order, since the layered silicate was only dispersed on a micron‐sized scale in the monomer (prior to reaction), as indicated by X‐ray diffraction measurements. Flow activation energies at a low frequency were determined and did not show any significant changes due to the addition of organoclay or CaCO3. Comparison between dynamic and steady shear experiments showed good agreement for low layered silicate concentrations below 7.5 wt%, i.e. the Cox‐Merz rule can be applied. Deviations from the Cox‐Merz rule appeared at and above 10 wt%, although such deviations were only slightly above experimental error. Most resin organoclay blends were well predicted by the Power Law model, only concentrations of 10 wt% and above requiring the Herschel‐Buckley (yield stress) model to achieve better fits. Wide‐angle X‐ray measurements have shown that the epoxy resin swells the layered silicate with an increase in the interlayer distance of approximately 15 Å, and that the rheology behavior is due to the lateral, micron‐size of these swollen tactoids.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li></region><settlement><li>Villeurbanne Cèdex</li></settlement></list><tree><country name="Australie"><noRegion><name sortKey="Becker, Ole" sort="Becker, Ole" uniqKey="Becker O" first="Ole" last="Becker">Ole Becker</name></noRegion><name sortKey="Halley, Peter J" sort="Halley, Peter J" uniqKey="Halley P" first="Peter J." last="Halley">Peter J. Halley</name><name sortKey="Simon, George P" sort="Simon, George P" uniqKey="Simon G" first="George P." last="Simon">George P. Simon</name><name sortKey="Simon, George P" sort="Simon, George P" uniqKey="Simon G" first="George P." last="Simon">George P. Simon</name><name sortKey="Sopade, Peter" sort="Sopade, Peter" uniqKey="Sopade P" first="Peter" last="Sopade">Peter Sopade</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Bourdonnay, Romain" sort="Bourdonnay, Romain" uniqKey="Bourdonnay R" first="Romain" last="Bourdonnay">Romain Bourdonnay</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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