The following papers are publications of NIST, an agency of the U.S. Government,
 and by stature is not subject to copyright in the United States.
 One can, thus, download those PDF's from NIST site, linking from this page.
 
 Due to change of web site of Polymers Division (or site policy?),
 the following PDF files except for Fire Division (paper #11) are disappered. 
 If you want to get the following paper's PDF file, 
 please contact me (asanoa@nda.ac.jp), thank you (2009/Feb./20).

14. Solid State NMR Investigation of Paramagnetic Nylon-6 Clay Nanocomposites. 2.
    Measurement of Clay Dispersion, Crystal Stratification, 
    and Stability of Organic Modifiers,
    [ PDF ]
    D.L. VanderHart, A. Asano, and J.W. Gilman,
    Chemistry of Materials, 2001, 13(10), pp.3796-3809.

13. Solid State NMR Investigation of Paramagnetic Nylon-6 Clay Nanocomposites. 1.
    Crystallinity, Morphology, and the Direct Influence of Fe+3 on Nuclear Spins,
    [ PDF ]
    D.L. VanderHart, A. Asano, and J.W. Gilman,
    Chemistry of Materials, 2001, 13(10), pp.3781-3795.

12. NMR Measurements Related to Clay-Dispersion Quality and 
    Organic-Modifier Stability in Nylon-6/Clay Nanocomposites,
    [ PDF ]
    D.L. VanderHart, A. Asano, and J.W. Gilman,
    Macromolecules, 2001, 34(12), pp.3819-3822.

11. Flame Retardant Mechanism of Silica Gel/Silica,
    [ PDF ]
    T. Kashiwagi, J.W. Gilman, K.M. Butler, R.H. Harris, 
    J.R. Shields, and A. Asano
    Fire and Materials, 2000, 24(6), pp.277-289.