物理化学学报 >> 2000, Vol. 16 >> Issue (06): 507-510.doi: 10.3866/PKU.WHXB20000606

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表面波技术研究TBP对C12E8表面流变性质的影响

韩国彬, 吴金添, 徐晓明   

  1. 厦门大学化学系，固体表面物理化学国家重点实验室，物理化学研究所，厦门 361005
  • 收稿日期:1999-09-17 修回日期:2000-01-10 发布日期:2000-06-15
  • 通讯作者: 韩国彬

Influence of TBP on the Surface Rheological Properties of C12E8 Studied by Surface Wave Method

Han Guo-Bin, Wu Jin-Tian, Xu Xiao-Ming   

  1. Department of Chemistry,State Key Laboratory for Physical Chemistry of Solid Surface,Institute of Physical Chemistry,Xiamen University,Xiamen 361005
  • Received:1999-09-17 Revised:2000-01-10 Published:2000-06-15
  • Contact: Han Guo-Bin

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摘要：

利用表面波技术研究消泡剂TBP对起泡剂C12E8 表面流变性质的影响 ,阐述泡沫的排液过程中液膜变形所产生的表面张力梯度修复机理以及液膜强度与表面膨胀模量、表面膨胀弹性和表面膨胀粘度的关系 ,并且探讨了消泡剂TBP的消泡机理. 实验结果表明 ,当起泡剂C12E8 浓度小于cmc时 ,TBP能大幅度地降低C12E8 的表面膨胀模量、表面膨胀弹性和表面膨胀粘度 ,其中对表面膨胀弹性的影响大于对表面膨胀粘度的影响 ,并且增加了C12E8 的表面粘度相角.但并没有改变C12E8 水溶液的表面粘弹性质.

关键词: 表面波, 消泡机理, 表面膨胀模量, 表面膨胀弹性, 表面膨胀粘度, 表面粘度相角

Abstract:

The influence of antifoaming agent TBP on the surface adsorption and on the surface rheological properties of foaming agent C12E8 is investigated by the damped longitudinal wave method, and the antifoaming mechanism of the antifoaming agent TBP on C12E8 is explored in this paper. The experimental results show that while the concentration of foaming agent C12E8 is smaller than cmc and at ω=6.28 rad•s-1, the decreases of surface dilational modulus, surface dilational elasticity, surface dilational viscosity and the increases of the phase angle when the concentration of TBP increase for the C12E8+TBP aqueous solution (C12E8=0.074 mmol•L-1) have been related to the diffusional exchange between surface and bulk and to the Marangoni effect, which depends on the restored mechanism of surface tension gradient due to the stretched surface. This has been related to the mechanism of antifoaming action.

Key words: Surface wave, Mechanism of antifoaming action, Surface dilational modulus, Surface dilational elasticity, Surface dilational viscosity, Phase angle