低聚醚季铵盐表面活性剂的动态表面张力研究

Dynamic Surface Tension of Oligomeric Polyether Quaternary Ammonium Salt

通过环氧氯丙烷、三乙胺和三氟化硼乙醚合成一种低聚合度的阳离子表面活性剂,测定了不同质量浓度水溶液的动态表面张力(DST)。结果表明:溶液浓度越高,动态表面活性越高,DST达到平衡越快,DST曲线越低;在研究的浓度范围内,吸附初期属扩散控制吸附,后期属混合动力吸附。测定了基本的表面活性,其CMC值为6.99g.L-1,γCMC为41.04mN.m-1。

An oligomeric polyether quaternary ammonium salt（PEQA） was synthesized using epichlorohydrin（ECH） and triethylamine（TEA） as the raw material.The dynamic surface tension（DST）of PEQA aqueous solution with different mass concentration was studied.The results showed that the higher the PEQA concentration,the higher the dynamic surface activity,together with the faster the DST achieving interface equilibrium,and the lower the DST curve.By determination of γ-cPEQA curve,the critical micelle concentration（CMC） value is 6.99g·L-1,γCMC is 41.04mN·m-1.