Journal article

A novel thermally-activated crosslinking agent for chitosan in aqueous solution: a rheological investigation

SB Johnson, DE Dunstan, GV Franks

COLLOID AND POLYMER SCIENCE | SPRINGER | Published : 2004

Abstract

The use of 2,5-dimethoxy-2,5-dihydrofuran (DHF) as a temperature-controlled gelation agent for chitosan under acidic conditions has been examined by dynamic oscillatory and viscometry techniques. In particular, the rate and extent of gelation have been examined over a range of different temperatures (40-98 °C), DHF concentrations (10-100 mM) and pH conditions (0.9-2.1). The gelation time, tG, decreases, and the maximum gelation rate increases substantially as a function of rising temperature. When fit with a simple Arrhenius function, the tG data yield an activation energy for gelation of 55 ± 8 kJ mol-1, Gelation is found to occur on the shortest time-scale, and the strongest gels result, a..

View full abstract