Effect of concentration and temperature on the rheological behavior of collagen solution
Effect of concentration and temperature on the rheological behavior of collagen solution
复制标题
浓度和温度对胶原溶液流变行为的影响
DOI：
10.1016/j.ijbiomac.2007.12.010
复制
发表时间：
2008-04-01
影响因子：
8.2
通讯作者：
Li, Guoying
中科院分区：
文献类型：
--
作者：
Lai, Guoli;Li, Yang;Li, Guoying
在20至32.5 ℃的温度范围内，通过振荡流变仪表征浓度为0.5-1.5%（w/w）的胶原溶液的动态粘弹性。所有胶原蛋白溶液均表现出剪切稀化流动行为。当胶原蛋白浓度（C-COL）>= 0.75%时，复合材料的复数粘度随胶原蛋白浓度（C-COL）的增加呈指数增加，损耗角正切值随胶原蛋白浓度（C-COL）的增加而减小。储能模量（G '）和损耗模量（G“）均随频率和浓度的增大而增大，随温度的升高而减小，在32.5 ℃时没有规律性。对于1.0%胶原蛋白溶液，松弛时间随着温度的升高而减小。根据三区模型，当CCOL不超过1.25%或规定温度不超过30 ℃时，胶原溶液的动态模量表现出末端区和平台区行为。浓缩液（1.5%）完全处于平台区。应用时间-温度叠加原理（TTS）建立了主曲线，并根据Arrhenius型TTS原理计算出活化能为161.4kJ mol（-1）。(C)2008 Elsevier B. V.保留所有权利。
Dynamic viscoelastic properties of collagen solutions with concentrations of 0.5-1.5% (w/w) were characterized by means of oscillatory rheometry at temperatures ranging from 20 to 32.5 degrees C. All collagen solutions showed a shear-thinning flow behavior. The complex viscosity exhibited an exponential increase and the loss tangent decreased with the increase of collagen concentration (C-COL) when the C-COL >= 0.75%. Both storage modulus (G') and loss modulus (G '') increased with the increase of frequency and concentration, but decreased with the increase of temperature and behaved without regularity at 32.5 degrees C. The relaxation times decreased with the increase of temperature for 1.0% collagen solution. According to a three-zone model, dynamic modulus of collagen solutions showed terminal-zone and plateau-zone behavior when CCOL was no more than 1.25% or the stated temperature was no more than 30 degrees C. The concentrated solution (1.5%) behaved being entirely in plateau zone. An application of the time-temperature superposition (TTS) allowed the construction of master curve and an Arrhenius-type TTS principle was used to yield the activation energy of 161.4 kJ mol(-1). (C) 2008 Elsevier B.V. All rights reserved.