Abstract
The reaction of hexamethylene diisocyanate with the surface of heat-activated vermiculite parallels the reactions with the oxides SiO2, Al2O3, MgO considered individually, which a number of authors have already described. The fixation ratio is about 5 molecules per 100 Å2 area. Nearly one half of the grafted molecules retain a “free” isocyanate function, which is requisite for a subsequent polyaddition of the processed mineral. The interaction with vermiculite occurs according to three principal processes; (i) formation of a surface urethane, (ii) formation of a surface carbamate, (iii) fixation by hydrogen bonds.
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Siffert, B., Biava, H. The Surface Reactivity of Vermiculite Towards Hexamethylene Diisocyanate (HMDI). Clays Clay Miner. 24, 303–311 (1976). https://doi.org/10.1346/CCMN.1976.0240606
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DOI: https://doi.org/10.1346/CCMN.1976.0240606