The rheological characteristics of the collagen fibril dispersions

In the paper,the tendon collagen fibrils were successfully prepared by the acid-enzyme hydrolysis method and the rheological characteristics of collagen fibril dispersions with different concentrations were studied by using coaxial viscometer. The results showed that the shear stress of collagen fibril dispersions with concentrations( 0. 5%,1. 0% and 1.5wt%) was increased with the increase of shear rate and the concentrations of collagen fibril dispersions. The apparent viscosity of collagen fibril dispersions was decreased as the temperature was increased. When the temperature reached 36℃,the apparent viscosity of collagen fibril dispersion was decreased sharply and the collagen fibrils demonstrated thermal denaturation. Meanwhile,collagen fibril dispersions presented typical pseudo plastic behavior,i. e. of shear-thinning phenomenon. Based on Ostwald de Wale model,the rheological models of collagen fibril dispersion at different temperatures were obtained. The fitting correlation coefficients( r2) of Ostwald de Wale model were 0. 991 or higher,which proved that Ostwald de Wale model could effectively characterize the rheological properties of collagen fibril dispersions.The results provide reliable theoretical foundation for processing,molding,and application of the collagen fibrils.