INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
On the intermolecular crosslinking of PVA chains en aqueous medium by boric acid
Autor/es:
M. MARTINS; E.R. BARRAK; G.A. ABRAHAM; A.A.A. DE QUEIROZ
Lugar:
Rio de Janeiro, Brasil
Reunión:
Congreso; World Polymer Congress MACRO2006; 2006
Institución organizadora:
Sociedad Brasileña de Polímeros y I.U.P.A.C.
Resumen:
The purpose of this study was to produce hydrogels based on poly(vinyl alcohol) (PVA) crosslinked with boric acid for applications in biotechnology. The crosslinked PVA membranes were characterized by differential scanning calorimetry (DSC) and thermomechanical analysis (TMA). The water transport through the crosslinked PVA was studied by equilibrium degree of swelling. The results of DSC and TMA indicate that both, glass transition temperature (Tg) and Young modulus were depressed systematically with the crosslinking density of the hydrogel. The water diffusion coefficients decreased with the increase in the crosslinking degree indicating that the water molecules still possess a lower degree of translation mobility and are "tightly bound" in the PVA-borate complex structure.