采用酸酶法制备牛肌腱胶原纤维,采用旋转粘度仪研究了不同浓度胶原纤维溶胀液的流变性能,并采用幂律方程对流变性能数据进行非线性回归拟合,得到胶原纤维在不同温度下的流变模型.研究结果表明,在实验范围内,浓度分别为0．5％,1．0％和1．5％的胶原纤维溶胀液的剪切应力均随着剪切速率与胶原纤维含量的增加而增大；随着温度的升高,胶原纤维溶胀液的表观粘度呈下降趋势,当体系温度达到36℃时,胶原纤维溶胀液的表观粘度下降急剧,胶原纤维发生热变性；胶原纤维溶胀液流体出现“剪切稀化”现象,表现出假塑性流体的特征,流变模型的拟合相关系数r2≥0．991,说明幂律模型能有效地表征胶原纤维溶胀液的流变性能.胶原纤维溶胀液的流变学特性研究为天然胶原纤维的进一步开发及利用提供了理论和实验依据.
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 stud-ied by using coaxial viscometer.The results showed that the shear stress of collagen fibril dispersions with con-centrations (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 3 6 ℃,the apparent viscosity of collagen fibril dispersion was de-creased sharply and the collagen fibrils demonstrated thermal denaturation.Meanwhile,collagen fibril disper-sions 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.
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