Abstract
Long PMMA chains were successfully attached to the surface of laponite layers through the [2-(acryloil-oxy)-ethyl]-trimethylammonium chloride linker. Grafting was carried out in water and the molecular weight of the grafted polymer changed between 40 and 110 kDa. The amount of PMMA attached to the silicate and the length of the polymer depended on the extent of ion exchange and on the amount of MMA added. The chemical structure of the attached polymer chains was confirmed by FTIR spectroscopy. Thermogravimetry, carried out before and after extraction, proved that most of the polymer was attached to the surface of the silicate. The layer distance of the silicate increased as the result of grafting. Model calculations proved that the polymer chains located inside the galleries are oriented parallel to the surface and two chains are found inside each gallery. The very high surface energy of the silicate leads to this parallel arrangement and the resulting strong interactions decrease the mobility of the chains. The glass transition temperature of the polymer increases while the change in specific heat decreases with decreasing chain length and PMMA amount.
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