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Ionic Liquid Modification of Layered Silicates for Enhanced Thermal Stability



A natural and synthetic layered silicate (LS) was modified with trihexyltetradecyl-phosphonium tetrafluoroborate (an ionic liquid) via a cationic exchange reacation. The exchange reaction and loading of modifier was investigated using a combination of WAXD, inductively coupled plasma-optical emmission spectroscopy (ICP-OES) and thermogravimetric analysis (TGA). The thermal stability of the modified LS was enhanced by up to 150 °C, when compared with conventional quaternary ammonium cations, making melt mixing of such modified nanoclays possible with poly(ethylene-terephthalate) (PET).

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