聚氰基丙烯酸正丁酯包覆玫瑰香精纳米胶囊的流变行为及其流变参数拟合

Rheological Experiment and Parameter Fitting of Rose Fragrance-Loaded Polybutylcyanoacrylate Nanocapsules

摘要:

对于采用乳液聚合法制备的聚氰基丙烯酸正丁酯（PBCA）包覆玫瑰香精纳米胶囊，研究壁材用量（0.4%、0.6%、0.8%）、香精用量（0.4%、0.6%、0.8%）和乳化剂用量（2%、3%、4%）的改变对此体系流变性的影响。稳态测试结果表明，随着剪切速率从0.001~500 s-1增大，体系的表观黏度随之下降至0.006 Pa.s，呈现出假塑性流体剪切变稀的流变特征；随着壁材用量、香精用量和乳化剂用量的增大，体系的表观黏度均大致上升了10倍。动态测试结果表明，随着香精用量和乳化剂用量的增大会导致体系的黏弹性能增强，而随着壁材用量的增加，体系的动态模量变化趋于复杂化。不同配方的玫瑰香精纳米胶囊体系的稳态流变曲线分别用Cross方程和Carreau方程均可以较好地进行拟合，标准误差也大多控制在10以内。

Abstract:

The change of wall material content (0.4%、0.6%、0.8%), fragrance content (0.4%、0.6%、0.8%) and emulsifier content (2%、3%、4%) had respectively an influence on the rheology of rose fragrance-loaded polybutylcyanoacrylate (PBCA) nanocapsules via emulsion polymerization. Steady state test showed that apparent viscosity decreased to 0.006 Pa.s with the increase of shear rate from 0.001 s-1 to 500 s-1, which presented shear thinning rheological property of pseudoplastic fluid; apparent viscosity increased 10 times with the increase of wall material content, fragrance content and emulsifier content. Dynamic test indicated that enhanced viscoelasticity resulted from the increase of fragrance content and emulsifier content; dynamic modulus had complex changes with the increase of wall material content. The steady state rheological curves of different formulation rose fragrance nanocapsules were fitted well by Cross equation and Carreau equation, and the standard error was mostly controlled within 10.