Modifications in the correlation function in poly(vinyl alcohol)/silica hybrid wet gels | Zendy

Vollet Dimas R. | Zendy; Donatti Dario A. | Zendy; Ibañez Ruiz Alberto | Zendy

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Modifications in the correlation function in poly(vinyl alcohol)/silica hybrid wet gels

Author(s) -

Vollet Dimas R.,

Donatti Dario A.,

Ibañez Ruiz Alberto

Publication year - 2009

Publication title -

journal of applied crystallography

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.429

H-Index - 162

ISSN - 1600-5767

DOI - 10.1107/s0021889808034900

Subject(s) - vinyl alcohol , fractal , fractal dimension , scattering , mass fraction , materials science , correlation function (quantum field theory) , power law , molar mass , small angle x ray scattering , polymer chemistry , chemistry , composite material , optics , physics , polymer , mathematics , dielectric , mathematical analysis , optoelectronics , statistics

Small‐angle X‐ray scattering was used to study structural modifications in tetraethoxysilane‐derived poly(vinyl alcohol) (PVA)/silica hybrids. The basic structure of the wet gels can be described as a mass‐fractal structure with fractal dimension D equal to 2 and characteristic length ξ, which increases with addition of PVA. Wet gels with high PVA content exhibit a positive deviation from the mass‐fractal power‐law scattering at low q ; this deviation is associated with additional scattering due to a second large correlation distance ζ, reinforced by the addition of PVA. The fraction of both contributions to the total correlation function was estimated; this is the first time that such a study has been carried out for mass‐fractal structures.

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