紫外光可固化纳米SiO_2复合体系流变性的研究

Rheological Propertyes of Nano -SiO_2 Composite System with Ultraviolet Light Curable

通过红外光谱表征纳米SiO2复合体系发现:纳米SiO2和有机基体间存在相互作用.对于二者的作用机理,提出了“核—过渡壳”结构模型.流变性能测试表明:纳米SiO2加入体系后,体系的最大动态表观粘度、最大剪切应力和触变指数分别提高了约40倍、约40倍和67.36%;纳米SiO2复合体系的剪切速率—粘度曲线,在低剪切速率下与高分子溶液相似,在高剪切速率下会发生“波动”.用“核—过渡壳”结构模型对纳米SiO2复合体系的流变行为进行了比较合理的解释.

The interactions between some components in composite system contained nanosilica(CSN)and nanosilica were researched by means of infrared spectrum(IR).In order to explain the mechanism of the interactions,a core -transition sh ell structure(C -TS)model was brought forward.Comparin g to neat system with no nanosilica,results of rheological measurements showed that the biggest dynamic apparent viscosity,the biggest shear stress and thixotropy index of CSN were improved about 40times,about 40times and 67.36%,respectively.The curve of shear rate and viscosity of CSN resembled that of polymer solution at low shear rate,but a little waviness was observed at high shear rate.Characteristics of rheology of CSN were explained properly in virtue of C -TS model.