吐温-80/正丁醇/环己烷/水系微乳液性能及对木材的渗透能力

考察了吐温-80/正丁醇/环己烷/水系微乳液各组分及其质量比对其形成的影响,通过电导率、表面张力和动态光散射(DLS)表征体系的物化性质。结果表明,以吐温-80为表面活性剂,正丁醇为助表面活性剂,环己烷为油相形成的微乳区较大。微乳体系的电导率随含水量的增加呈现规律性变化,可以判断微乳液的3种类型(油包水型、双连续型和水包油型);不同类型的微乳液均具有较低的表面张力(约24.6 mN/m)和粒径(小于100nm),且粒径随体系含水量的增加而增大。此外,采用液体吸收法考察了微乳液对木材的渗透能力,与普通溶剂相比,微乳液具有很强的渗透能力,特别是对于双连续型微乳液,10 min时,对马尾松和桉木的渗透能力分别达70%和50%。

Properties of C Tween-80/ n-Butanol/cyclohexane/Water Microemulsion and Its Osmosis for Wood

The effect of each component and their mass ratios of Tween-80/n-butanol/cyclohexane/water microemulsion on its formation were studied,and the system′s physicochemical properties have also been characterized by means of conductivity,surface tension and dynamic light scattering(DLS) measurements.The results show that the microemulsion forming area was largest by using Tween-80 as the surfactant,n-butanol as co-surfactant,and cyclohexane as oil.The conductivity of the system represented regular change along with the increase of water content,which can be used to identify the three types of microemulsions(water-in-oil,bicontinuous and oil-in-water).The three different types of microemulsions had very low surface tension(about 24.6 mN/m) and small practical size(less than 100 nm),increasing along with the water content of the system.Furthermore,the osmosis of the microemulsion for wood was investigated by adopting liquid absorption method.Compared with other solvents,microemulsions exhibit greater penetration ability for wood.This is especially obvious for the bicontinuous microemulsion;its osmosis for pine and eucalyptus at 10 min reached 70% and 50%,respectively.