String phase formation in biopolymer aqueous solution blends
String phase formation in biopolymer aqueous solution blends
复制标题
生物聚合物水溶液共混物中线相的形成
DOI：
10.1122/1.1603238
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发表时间：
2003
影响因子：
3.3
通讯作者：
W. Frith
中科院分区：
文献类型：
--
作者：
B. Wolf;W. Frith
在先前的出版物中，已经表明适用于两相聚合物共混物或溶液以及不混溶乳液的流动-形态关系也适用于混合生物聚合物的两相水溶液（在此称为“生物聚合物共混物”）。所讨论的关系是剪切流中单滴变形的经典理论，稳定剪切流停止时的原纤维破裂，以及Palierne模型。在本文中，我们报告的实验研究的字符串相形成在稳定的剪切作为另一种结构现象，已观察到的聚合物共混物或聚合物溶液中，但以前没有报道的生物聚合物共混物。采用传统的旋转流变仪和剪切显微镜技术分析了明胶-葡聚糖混合物的流变学和形态学行为。结果表明，弦状相的形成与剪切速率、粘度比和次相体积有关。由久米和桥本（1995）预测弦相形态的流变模型被成功地应用于粘度比不是太不同于1。然而，Jeon和Hobbie（2001）应用的另一个模型在预测弦相形成方面给出了模糊的结果，在以前的出版物中已经表明，适用于两相聚合物共混物或溶液以及不混溶乳液的流动-形态关系也适用于混合生物聚合物的两相水溶液（这里称为“生物聚合物共混物”）。所讨论的关系是剪切流中单滴变形的经典理论，稳定剪切流停止时的原纤维破裂，以及Palierne模型。在本文中，我们报告的实验研究的字符串相形成在稳定的剪切作为另一种结构现象，已观察到的聚合物共混物或聚合物溶液中，但以前没有报道的生物聚合物共混物。采用传统的旋转流变仪和剪切显微镜技术分析了明胶-葡聚糖混合物的流变学和形态学行为。结果表明，弦状相的形成与剪切速率、粘度比和次相体积有关。流变模式...
In previous publications it has been shown that the flow-morphology relationships that apply to two-phase polymer blends or solutions, and to immiscible emulsions, also apply to two-phase aqueous solutions of mixed biopolymers, (referred to here as “biopolymer blends”). The relationships in question are classical theories of single drop deformation in shear flow, fibril breakup upon cessation of steady shear flow, and the Palierne model. In this paper, we report the experimental investigation of string phase formation in steady shear as another structural phenomenon which has been observed in polymer blends or polymer solutions, but has not been previously reported for biopolymer blends. The rheological and morphological behavior of gelatin-dextran mixtures was analyzed using conventional rotational rheometry and shear-microscopy techniques. It was found that the development of a string phase depends on the applied shear rate, the viscosity ratio and the phase volume of the minor phase. A rheological model by Kume and Hashimoto (1995) predicting string phase morphology was successfully applied for viscosity ratios not too dissimilar from unity. The application of a further model by Jeon and Hobbie (2001), however, gave ambiguous results with regard to the prediction of string phase formation.In previous publications it has been shown that the flow-morphology relationships that apply to two-phase polymer blends or solutions, and to immiscible emulsions, also apply to two-phase aqueous solutions of mixed biopolymers, (referred to here as “biopolymer blends”). The relationships in question are classical theories of single drop deformation in shear flow, fibril breakup upon cessation of steady shear flow, and the Palierne model. In this paper, we report the experimental investigation of string phase formation in steady shear as another structural phenomenon which has been observed in polymer blends or polymer solutions, but has not been previously reported for biopolymer blends. The rheological and morphological behavior of gelatin-dextran mixtures was analyzed using conventional rotational rheometry and shear-microscopy techniques. It was found that the development of a string phase depends on the applied shear rate, the viscosity ratio and the phase volume of the minor phase. A rheological mode...