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Rheological properties of pectin-polycation crosslinked films

G. ZSIVANOVITS1,* , M. MARUDOVA-ZSIVANOVITS2

Affiliation

  1. Canning Research Institute, Agricultural Academy, 154 Vassil Aprilov Blvd., 4000, Plovdiv, Bulgaria
  2. Department of Experimental Physics, University of Plovdiv, 24 Tzar Assen Str., 4000, Plovdiv, Bulgaria

Abstract

The effect of chitosan oligomers on pectin films was studied. The films varied in pectin type (charge density and charge density distribution) and in oligomer concentration. The equilibrium degree of swelling was determined in controlled osmotic pressure solutions, until a constant weight was achieved. The rheological properties of swelled films were examined by a Stable Micro Systems penetrometer in tensile mode, with hysteresis and stress relaxation tests. To analyze these curves, the mechanical energy absorption, relative non-elastic deformation and parameters of the Zener model (E 1 , E2 moduli, relaxation time and “stretched exponent” coefficient,) were calculated. The results show that chitosan oligomers crosslink pectin films. The efficacy of crosslinking depends on the pectin charge density and charge density distribution. The crosslinking leads to a decrease in swelling, and increase in the elasticity and rigidity of the films..

Keywords

Pectin-chitosan films, Relaxation properties, Hysteresis properties, Rheological model.

Submitted at: Nov. 5, 2008
Accepted at: Oct. 3, 2009

Citation

G. ZSIVANOVITS, M. MARUDOVA-ZSIVANOVITS, Rheological properties of pectin-polycation crosslinked films, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 10, pp. 1416-1419 (2009)