Telechelic ionomeric poly(butylene terephthalate) nanocomposites with organically modified clays have been prepd. by the melt intercalation technique both in Brabender mixer and in twin screw-extruder. The presence of ionic groups tethered at the end of the polymer chains permits electrostatic interaction between the polymer and the surface of an organically modified clays providing a thermodn. driving force for the dispersion of the clay platelets in the polymer matrix. The improved dispersion has been verified by TEM and XRD analyses. Nanocomposites with telechelic polymers present therefore consistently higher thermo-mech. properties and improved thermal and hydrolytic stability respect to nanocomposites with std. PBT. Nanocomposite obtained using PBT with 3% telechelic ionic groups and with 5% of clay present a heat deflection temp. that is 48 °C higher compared to that of the com. material. The presence of the clay also slightly increases the thermal and hydrolytic stability respect to std. PBT.

Nanocomposite of montmorillonite with telechelic sulfonated poly(butylene terephthalate): Effect of ionic groups on clay dispersion, mechanical and thermal properties

COLONNA, MARTINO;BERTI, CORRADO;FIORINI, MAURIZIO;
2010

Abstract

Telechelic ionomeric poly(butylene terephthalate) nanocomposites with organically modified clays have been prepd. by the melt intercalation technique both in Brabender mixer and in twin screw-extruder. The presence of ionic groups tethered at the end of the polymer chains permits electrostatic interaction between the polymer and the surface of an organically modified clays providing a thermodn. driving force for the dispersion of the clay platelets in the polymer matrix. The improved dispersion has been verified by TEM and XRD analyses. Nanocomposites with telechelic polymers present therefore consistently higher thermo-mech. properties and improved thermal and hydrolytic stability respect to nanocomposites with std. PBT. Nanocomposite obtained using PBT with 3% telechelic ionic groups and with 5% of clay present a heat deflection temp. that is 48 °C higher compared to that of the com. material. The presence of the clay also slightly increases the thermal and hydrolytic stability respect to std. PBT.
Colonna M.; Berti C.; Binassi E.; Fiorini M.; Karanam S.; Brunelle D. J.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/99289
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