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Rheology of chemically modified triglycerides

机译：化学改性甘油三酸酯的流变学

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The rheology of chemically modified plant oils was determined to aid in their processing for polymers and other applications. Epoxidized and acrylated triglycerides were derived from various plant oils and model triglycerides. The viscosity of the unmodified oils decreased as the level of oil unsaturation increased. However, the viscosity of the epoxidized oils increased slightly as the level of epoxidation increased. Furthermore, the viscosity of the acrylated oils increased exponentially as the level of acrylation increased because of increased polarity. In addition, the viscosity of the acrylated oils increased as the average distance of the acrylate groups from the fatty acid chain ends decreased. Chemically modified and unmodified oils did not exhibit any shear-thinning behavior or any memory of shear history. The temperature dependence of the viscosity followed the Arrhenius law, and the activation energy decreased linearly with the level of acrylation. The addition of comonomers, such as styrene, reduced the viscosity of the acrylated oils exponentially as the comonomer concentration increased. However, the glass-transition temperature and modulus of the triglyceride-based polymers decreased as the styrene content decreased. (C) 2004 Wiley Periodicals, Inc.
机译：确定了化学改性植物油的流变性，以帮助其加工聚合物和其他应用。环氧和丙烯酸酯化的甘油三酸酯衍生自各种植物油和模型甘油三酸酯。随着油不饱和度的增加，未改性油的粘度降低。然而，随着环氧化水平的增加，环氧化油的粘度略有增加。而且，由于极性增加，丙烯酸酯化油的粘度随着丙烯酸化程度的增加而呈指数增加。另外，随着丙烯酸酯基团与脂肪酸链末端的平均距离的减小，丙烯酸酯化油的粘度增加。化学改性和未改性的油没有表现出任何剪切稀化行为或任何剪切历史记忆。粘度的温度依赖性遵循阿伦尼乌斯定律，并且活化能随丙烯酸水平而线性降低。随着共聚单体浓度的增加，共聚单体（例如苯乙烯）的添加成倍地降低了丙烯酸酯化油的粘度。然而，随着苯乙烯含量的降低，基于甘油三酸酯的聚合物的玻璃化转变温度和模量降低。 （C）2004年Wiley Periodicals，Inc.

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