十二烷基硫酸钠-长链醇体系泡沫性能与表面参数关系研究

使用德国KRSS公司生产的DSA100界面扩张流变仪,采用小幅周期振荡法在室温下考察十二烷基硫酸钠(SDS)和十二烷基硫酸钠/长链醇体系的泡沫性能(起泡性和稳定性)与表面参数(表面张力和表面扩张流变性)之间的关系。结果表明:向SDS溶液中分别加入十二醇、十四醇、十六醇和十八醇,体系的起泡体积和析液半衰期会随着醇的链长的增加先增大后减小,表面张力会先减小后增大,而体系的扩张模量、弹性模量和表面黏度都会先增大后减小;体系的起泡性由表面张力和表面黏弹性共同决定;体系的析液半衰期随着扩张模量、弹性模量和黏性模量增大而增大,并且析液半衰期与弹性模量具有较为明显的线性关系。

Investigation of relationship between foam performance and surface dilatational rheology of sodium dodecyl sulfate/alcohol system

The relationship between foam performance(foamability and stability) of sodium dodecyl sulfate (SDS) and sodium dodecyl sulfate/long chain alcohol systems and surface parameters (surface tension and surface dilatational rheology) was investigated using small periodic oscillation method at room temperature by DSA100interfacial dilatational rheometer. The results show that foaming volume and drainage half-life of the systems firstly increase and then decrease with addition of laurylalcohol, myristyl alcohol, cetyl alcohol and stearyl alcohol. Surface tension of the systems firstly decreases and then increases, while dilational modulus, elastic modulus and surface viscosity of the systems firstly increase and then decrease. In addition, the foamability of the systems is determined by surface tension and surface viscoelasticity. Drainage half-life increases with the increase of the dilational modulus, elastic modulus and viscous modulus of the systems while it has a particularly obvious linear relationship with the elastic modulus.