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The Surface Reactivity of Vermiculite Towards Hexamethylene Diisocyanate (HMDI)

Published online by Cambridge University Press:  01 July 2024

B. Siffert  and
H. Biava
B. Siffert
Affiliation:
Centre de Recherches sur la Physico-Chimie des Surfaces Solides, 24, Avenue du Président Kennedy, 68200 Mulhouse, France
H. Biava
Affiliation:
Centre de Recherches sur la Physico-Chimie des Surfaces Solides, 24, Avenue du Président Kennedy, 68200 Mulhouse, France
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Abstract

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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.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 6 , December 1976 , pp. 303 - 311
Copyright
Copyright © 1976 The Clay Minerals Society

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