Structural and rheological properties of chitosan semi-interpenetrated networks |
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Authors: | L Payet A Ponton J -L Grossiord and F Agnely |
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Institution: | 1.Matière et Systèmes Complexes UMR 7057 CNRS & Université Paris Diderot-Paris 7,Paris Cedex 13,France;2.Université Paris-Sud 11 UMR CNRS 8612,Faculté de Pharmacie,Chatenay-Malabry Cedex,France |
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Abstract: | The local structure and the viscoelastic properties of semi-interpenetrated biopolymer networks based on cross-linked chitosan
and poly(ethylene oxide) (PEO) were investigated by Small Angle Neutron Scattering and rheological measurements. The specific
viscosity and the entanglement concentration of chitosan were first determined, respectively, by capillary viscosimetry and
steady-state shear rheology experiments performed at different polymer concentrations. Mechanical spectroscopy was then used
to study the gelation process of chitosan/PEO semi-interpenetrated networks. By fitting the frequency dependence of the elastic
and loss moduli with extended relations of relaxation shear modulus around the sol-gel transition, it was shown that the addition
of PEO chains had a significant effect on the viscoelastic properties of aqueous chitosan networks but no effect on the gelation
time. The improvement of mechanical properties was in accordance with the correlation length decrease deduced from Small Angle
Neutron Scattering experiments. |
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