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Citation: Wang Yi-Yang, Zhang Lu, Sun Tao-Lei, Fang Hong-Bo, Zhao Sui, Yu Jia-Yong. Influences of Demulsifiers with Different Structures on Dilational Properties of Decane-Water Interface by Interfacial Tension Relaxation Methods[J]. Acta Physico-Chimica Sinica, ;2003, 19(05): 455-459. doi: 10.3866/PKU.WHXB20030516 shu

Influences of Demulsifiers with Different Structures on Dilational Properties of Decane-Water Interface by Interfacial Tension Relaxation Methods

1.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing　100101;Prospecting and Designing Research Institute, Shengli Petroleum Administrative Bureau, Dongying　257026

Received Date: 3 September 2002
Available Online: 15 May 2003

The dilational viscoelasticity properties of decane-water interface containing two demulsifiers with straight chain (SP169, octadecanol polyoxypropylene-polyoxyethylene ether) and branch chain (AE121, tetraethylenehexamine polyoxypropylene-polyoxyethylene ether) respectively were investigated by interfacial tension relaxation method. The dependence of dilational modulus on dilational frequency was expounded. Our results show that when the dilational frequency is lower, the dilational modulus of the two demulsifiers approaches zero; the dilational modulus of the two demulsifiers increases when the dilational frequency becomes higher in the range of medial frequency; and when the dilational frequency is much higher, the dilational modulus of the two demulsifiers reaches to a limiting dilational viscoelasticity. It is also shown that dilational modulus of the two demulsifiers approaches a maximum value near the critical micelle concentration. Along with the increase of demulsifier concentration, the number of relaxation processes gradually increases and the contribution of them also changes regularly.
- Demulsifier;Dilational modulus;Dilational elasticity;Interfacial tension relaxation;Interfacial dilational viscoelasticity
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