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Polymer chains grafted "to" and "from" layered silicate clay platelets.

¹Department of Chemistry and Applied Biosciences, Institute of Chemical and Bioengineering, ETH Zurich, 8093 Zurich, Switzerland. vikas.mittal@chem.ethz.ch

Journal of Colloid and Interface Science

|June 26, 2007

Summary

Grafting lauryl methacrylate onto montmorillonite clay surfaces was achieved via polymerization. Nitroxide-mediated living polymerization significantly enhanced organic coverage, improving clay exfoliation in polymer matrices.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Montmorillonite clay platelets require surface modification for effective dispersion in polymer matrices.
Improving organic coverage of clay surfaces is crucial for enhancing compatibility with polymers.

Purpose of the Study:

To investigate polymerization of lauryl methacrylate onto and from montmorillonite surfaces.
To optimize conditions for achieving significant polymer grafting and clay exfoliation.

Main Methods:

Polymerization 'to' the surface involved pre-functionalizing the clay with methacrylic groups.
Polymerization 'from' the surface utilized a surface-bound bicationic initiator.
Nitroxide-mediated living polymerization was employed for controlled grafting.
Techniques like X-ray diffraction, transmission electron microscopy, and thermogravimetric analysis were used for characterization.

Main Results:

Polymerization 'to' the surface yielded substantial polymer attachment under specific conditions (low temperature, long reaction time).
Bulk polymerization proved effective for increasing surface polymer mass.
Nitroxide-mediated living polymerization successfully grafted significant organic mass onto clay surfaces by minimizing termination.
Excess unbound ammonium ions were carefully avoided to prevent interference.

Conclusions:

Successful grafting of lauryl methacrylate onto montmorillonite surfaces was confirmed.
Nitroxide-mediated living polymerization is a viable strategy for achieving high organic coverage and improved clay exfoliation.
Optimized polymerization conditions are key to enhancing the performance of clay-polymer nanocomposites.