【摘要】 研究了天然胶原溶液的流变学性质,讨论了浓度、温度对胶原流变特性的影响。结果表明:随着浓度的增大,胶原溶液的弹性模量(G′)、粘性模量(G″)和复数黏度(η*)都提高,并且出现假固态行为,当胶原溶液浓度大于0.75%,胶原溶液的粘弹性突然呈数量级增大,另外胶原溶液的内耗(tanδ)随着溶液浓度的升高而增大,在浓度为0.75%的时候达到最大值而后逐渐减小;随着温度的升高,胶原溶液的G′、G″和η*都降低,而tanδ升高,并且表现出假液态行为,当温度低于25℃时,胶原溶液的各种性能变化并不明显,当温度升高到32.5℃时,G′、G″、η*和tanδ突然降低到很小值且缺乏规律性,表明在该温度下胶原的天然结构已经被破坏。更多还原

【Abstract】 Rheological behaviors of natural collagen solution and the influences of concentration and temperature on the rheological behaviors were studied.The results showe that the elastic modulus(G’),viscous modulus(G″) and complex viscosity(η*) of collagen increase with increase of concentration,especially when collagen with a high concentration.The crossover frequency(f),at which transition from liquid-like to solid-like behaviors took place,shiftes toward lower frequencies with the increase of concentration,which is called pseudo-solid like behaviors.Loss tangent(tanδ) increases with the increase of concentration and gets maximum at 0.75% then decreases.However,G’,G″ and η*of collagen all decrease while tanδincrease with an increase of temperature,which is indistinct below 25℃.The crossover f shiftes toward higher frequencies with the increase of temperature,which is called pseudo-liquid like behaviors.G’,G″,η* and tanδare irregular and decrease to a very small value at 32.5℃,indicating that the configuration of collagen has changed.更多还原