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Polyvinyl Alcohol-Clay Complexes Formed by Direct Synthesis

Published online by Cambridge University Press:  28 February 2024

Kathleen A. Carrado ,
P. Thiyagarajan  and
Delwin L. Elder
Kathleen A. Carrado
Affiliation:
Chemistry Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439
P. Thiyagarajan
Affiliation:
Intense Pulsed Neutron Source Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439
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Abstract

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Synthetic hectorite clay minerals were hydrothermally crystallized with direct incorporation of a series of five water-soluble polyvinyl alcohols (PVA) of molecular weights from 9000-146,000. The molecular weight of PVA had little effect on the success of hydrothermal hectorite synthesis, d-spacing or the amount of polymer incorporated. The basal spacings range from 19.5 Å to 20.8 Å and the amount of polymer incorporated ranges from 20 wt.% to 23 wt.%. Incorporation of PVA within the clay inter-layers, along with Li(I) ions to compensate the lattice charge, is indicated. Thermal gravimetric analysis and small angle neutron scattering were used to further examine the polymer-clay systems. Small PVA-clay crystallites that are coated with excess PVA are indicated. Removal of the polymer does not alter the extended synthetic clay network, and the nitrogen BET surface area increases from <5 m2/g to >200 m2/g.

Keywords

ClaysDirect SynthesisHectoriteHydrothermal CrystallizationPolymer ClaysPolyvinyl AlcoholPVA
Type
Research Article
Information
Clays and Clay Minerals , Volume 44 , Issue 4 , August 1996 , pp. 506 - 514
Copyright
Copyright © 1996, The Clay Minerals Society

Footnotes

‡

The submitted manuscript has been authored by a contractor of the U.S. Government under contract No. W-31-109-ENG-38. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so for U.S. Government purposes.

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