推进剂模拟液的室温快速胶凝化及其流变学性能

Instant Gelation of a Simulated Agent for Liquid Propellants at Room Temperature and Rheological Property Studies of Relevant Gels

添加羧酸盐调制表面活性剂在极性混合溶剂中的簇集行为,实现了推进剂模拟液的室温快速胶凝。采用3因素4水平正交实验系统考察了混合溶剂组成、胶凝剂组分(表面活性剂/羧酸盐)比例、凝胶形成温度等三种因素对推进剂模拟液凝胶力学强度、高剪切速率下粘度的影响。极差分析表明影响模拟液凝胶力学强度的因素主要是胶凝剂组成,其次是混合溶剂组成,影响最小的是凝胶形成的温度。而影响高剪切速率下凝胶体系粘度的因素依次为混合溶剂组成、凝胶形成温度和胶凝剂组成。结合频率扫描结果,筛选出了一种稳定性高、高剪切速率下粘度低的比较理想的推进剂模拟液凝胶体系:表面活性剂与羧酸盐的物质的量之比为2:1,二者的质量之和占体系质量的2.4%,溶剂水与乙二胺的体积比为1:3。该凝胶屈服应力为794.3 Pa,极限剪切速率下粘度13.7 mPa·s。

A simulated agent for liquid propellants was gelled efficiently and instantly at room temperature by modulating aggregate behaviors of a typical surfactant with the addition of a carboxylic salt in two polar solvent mixtures.An orthogonal test（three factors and four levels）was employed to investigate the factors affecting the rheological properties of the gels of the simulated agent.Results show that the significance of the factors affecting the mechanical strength of the gels follows the order of（1）the composition of the composite gelators（a surfactant and a carboxylic salt）,（2）the composition of the mixture solvents,and（3）the temperature at which the gel had been prepared.However,the factors affecting the viscosity of the gel systems at higher shear rate（4355.0 s-1）follows another order,that is（1）the composition of the mixture solvents,（2）the gel preparation temperature,and（3）the composition of composite gelators.Considering the results from frequency scan and those from orthogonal test,a gel from the simulated agent having high stabilities and low-viscosity at a high shear rate was obtained.In the gel formula,the molar ratio of the composite gelators,and the volume ratio of the mixture solvents are 2：1 and 1：3,respectively,and the total mass percentage of the composite gelators is 2.4%.Moreover,the dynamic yield value and the viscosity of the gel at higher shear rate are 794.3 Pa and 13.7 mPa·s,respectively.