Affiliation:
1. Federal University of Minas Gerais
Abstract
Polyvinyl alcohol (PVA) is a unique synthetic biocompatible polymer and it has a large
number of hydroxyl groups that can react with many kinds of functional groups. In the present work,
nanostructured PVA/TEOS hybrids were characterized by Small-angle X-ray Scattering (SAXS)
associated with Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD)
techniques. We have synthesized hybrids based on the reaction of PVA with tetraethoxysilane
(TEOS). PVA/TEOS hybrids were also modified in the nanometer-scale by crosslinking with
glutaraldehyde (GA) during the synthesis involving hydrolysis and condensation of PVA/TEOS
network. FTIR spectra showed major vibration bands associated with organic-inorganic chemical
groups present in the hybrid composite PVA/TEOS. XRD coupled to FTIR results have indicated the
presence of semi-crystalline domains embedded in amorphous PVA matrix. SAXS results were
presented as plots with experimental scattering intensity, I(q), as a function of the modulus of the
scattering vector, q. SAXS curves showed quite different trend on vector q with the scattering
intensity I(q) corresponding to samples PVA, PVA/GA and PVA/TEOS/GA. Pure PVA sample
showed a “knee” type curve, with maximum value q=0.04 Å-1. These results have indicated different
nano-ordered disperse phases for PVA, PVA/TEOS hybrid and PVA/TEOS/GA chemically
crosslinked hybrid.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics
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