【摘要】 采用共轴圆筒旋转流变仪和锥-板型转子流变仪研究了聚乙烯醇(PVA)和胶原(COL)共混溶液的稳态和动态流变性能,讨论了温度、共混比、浓度对流动曲线的影响。结果表明:PVA/COL共混溶液为假塑性流体,其偏离牛顿流动行为的程度与共混物的组成和浓度有关。胶原对于体系流变性质的影响居于主要地位,共混溶液具有和胶原相似的流变行为,如弹性效应占主导(G′>G″)、相似的剪切变稀曲线、相近的动态变性温度等。当PVA含量增至80%时,PVA/COL共混溶液的动态变性温度比纯胶原的提高了约2℃,且流动性好。浓度对于PVA/COL共混体系粘弹性的贡献以弹性增加为主;浓度越高,流体弹性特征越显著且结构越稳定。更多还原

【Abstract】 The static and dynamic rheological behaviors for blends of collagen(COL) with poly(vinyl alcohol)(PVA) were investigated by a coaxial viscometer and an dynamic rhemeter with cone/plate system.The influences of temperature,blend ratio and solid content on the flow curves were discussed.It was found that the PVA/COL blends belonge to the pseudo-plastic liquids and the degree of deviation to Newtonian fluid has relation with the composition and solid content of the blends.Collagen was the dominant content in the rheological behaviors of PVA/COL blends.It seemed collagen and its blends behaved similarly,such as dominate elastic appearance(G′>G″),the similar shear thinning behavior and the nearly same thermal denaturation.The denaturation temperature for 80/20(PVA/COL) blend with fine fluidity was about 2 ℃ higher than that for pure collagen alone.The contribution of solid content to the viscoelastic properties was mainly increasing the elasticity of PVA/COL blends.The PVA/COL blends with higher solid content showed more dominant elastic property as well as the more stable flow structure than that with lower solid content.更多还原