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›› 2001, Vol. 1 ›› Issue (2): 0-0.

• 2 •    

EO-PPO-PEO嵌段共聚物的表面活性

苏延磊, 郭晨, 魏晓芳, 刘会洲   

  1. 中国科学院化工冶金研究所分离科学与工程青年室,生化工程国家重点实验室,北京 100080
  • 出版日期:2001-04-20 发布日期:2001-04-20

Investigation of Surface Activity of PEO–PPO–PEO Triblock Copolymers in Aqueous Solution

SU Yan-lei, GUO Chen, WEI Xiao-fang, LIU Hui-zhou   

  1. Youth Lab. of Sep. Sci. and Eng., State Lab. of Biochem. Eng, Institute of Chemical Metallurgy, Chinese Academy of Sciences, Beijing 100080, China
  • Online:2001-04-20 Published:2001-04-20

摘要: 采用吊环法测量了PEO–PPO–PEO 嵌段共聚物溶液的表面张力,观测到嵌段共聚物溶液的表面张力随着时间延长逐渐降低. 根据嵌段共聚物在气液界面形成分子刷的结构模型, 解释了嵌段共聚物溶液的表面张力随浓度的变化.

关键词: PEO–PPO–PEO嵌段共聚物, 非离子表面活性剂, 表面活性, 吸附

Abstract: Surface tension measurements of PEO–PPO–PEO P84, P103, P104, P123 and F127 aqueous solutions were obtained with the ring method. The surface tension was observed to decrease as time elapses. The difference of surface activity of block copolymer from low molecular hydrocarbon surfactant can be attributed to block copolymer forming molecular brush at air–water interface. Using the molecular brush model, surface tension curves as a function of concentration could be divided into four regions: gas film region, transition region, molecular brush region, and saturated adsorption region. In the molecular brush region, there is an inflexion point, at which the interaction in the molecular brushes strongly affects surface tensions of block copolymer solutions.

Key words: PEO–PPO–PEO triblock copolymer, nonionic surfactant, surface activity, adsorption

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