支链化阳离子和甜菜碱表面活性剂对聚四氟乙烯表面润湿性的影响

doi:10.3866/PKU.WHXB201503028

物理化学学报 >> 2015, Vol. 31 >> Issue (4): 715-721.doi: 10.3866/PKU.WHXB201503028

支链化阳离子和甜菜碱表面活性剂对聚四氟乙烯表面润湿性的影响

元福卿^1,2, 刘丹丹³, 郭兰磊², 祝仰文², 徐志成³, 黄建滨⁴, 张磊³, 张路³

1 中国石油大学(华东)石油工程学院, 山东青岛266555;
2 中国石化胜利油田分公司地质科学研究院, 山东东营257015;
3 中国科学院理化技术研究所, 北京100190;
4 北京大学化学与分子工程学院, 北京100871

收稿日期:2015-01-08 修回日期:2015-02-10 发布日期:2015-04-03
通讯作者: 张路 E-mail:luyiqiao@hotmail.com
基金资助:
国家科技重大专项(2011ZX05011-004)资助项目

Effect of Branched Cationic and Betaine Surfactants on the Wettability of a Poly(tetrafluoroethylene) Surface

YUAN Fu-Qing^1,2, LIU Dan-Dan³, GUO Lan-Lei², ZHU Yang-Wen², XU Zhi-Cheng³, HUANG Jian-Bin⁴, ZHANG Lei³, ZHANG Lu³

1 College of Petroleum Engineering, China University of Petroleum (Huadong), Qingdao 266555, Shandong Province, P. R. China;
2 Geological Scientific Research Institute of Shengli Oilfield Co. Ltd., SINOPEC, Dongying 257015, Shandong Province, P. R. China;
3 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China;
4 College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received:2015-01-08 Revised:2015-02-10 Published:2015-04-03
Contact: ZHANG Lu E-mail:luyiqiao@hotmail.com
Supported by:
The project was supported by the Important National Science & Technology Specific Projects of China (2011ZX05011-004).

摘要/Abstract

摘要：

利用座滴法研究了支链化阳离子表面活性剂十六烷基羟丙基氯化铵(C₁₆GPC)和两性离子表面活性剂十六烷基羧酸甜菜碱(C₁₆GPB)在聚四氟乙烯(PTFE)表面上的吸附机制和润湿性质, 考察了表面活性剂浓度对表面张力、接触角、粘附张力、固液界面张力和粘附功的影响趋势. 研究发现, 低浓度条件下, 表面活性剂疏水支链的多个亚甲基基团与PTFE表面发生相互作用, 分子以平躺的方式吸附到固体界面; 支链化表面活性剂形成胶束的阻碍较大, 浓度大于临界胶束浓度(cmc)时, C₁₆GPC和C₁₆GPB分子在固液界面上继续吸附, 与PTFE作用的亚甲基基团减少, 分子逐渐直立, 固液界面自由能(γ_sl)明显降低. 对于支链化的阳离子和甜菜碱分子, 接触角均在浓度高于cmc后大幅度降低.

关键词: 阳离子表面活性剂, 两性离子表面活性剂, 支链, 接触角, 聚四氟乙烯表面

Abstract:

The adsorption mechanism and wetting properties of aqueous solutions of branched cationic surfactants, hexadecanol glycidyl ether ammonium chloride (C₁₆GPC), and zwitterionic surfactant, hexadecanol glycidyl ether glycine betaine (C₁₆GPB) on a poly(tetrafluoroethylene) (PTFE) surface were investigated using sessile drop analysis. The influences of surfactant concentration on surface tension, contact angle, adhesional tension, PTFE-solution interfacial tension, and adhesion work were expounded. The results indicate that branched surfactant molecules lie parallel to the PTFE surface through hydrophobic interactions between the multi methylene groups of the alkyl chain and the solid surface below the critical micelle concentration (cmc). C₁₆GPC and C₁₆GPB molecules still adsorb onto PTFE because of the marked hindrance of branched chains to the formation of micelles above the cmc. The methylene group interactions with PTFE decrease and C₁₆GPC and C₁₆GPB molecules become straightened on the solid surface, which results in a clear decrease in PTFE-solution interfacial tension (γ_sl). For branched surfactants, an abrupt decrease in contact angle appears above the cmc.

Key words: Cationic surfactant, Zwitterionic surfactant, Branched chain, Contact angle, Poly(tetrafluoroethylene) surface

元福卿, 刘丹丹, 郭兰磊, 祝仰文, 徐志成, 黄建滨, 张磊, 张路. 支链化阳离子和甜菜碱表面活性剂对聚四氟乙烯表面润湿性的影响[J]. 物理化学学报, 2015, 31(4), 715-721. doi: 10.3866/PKU.WHXB201503028

YUAN Fu-Qing, LIU Dan-Dan, GUO Lan-Lei, ZHU Yang-Wen, XU Zhi-Cheng, HUANG Jian-Bin, ZHANG Lei, ZHANG Lu. Effect of Branched Cationic and Betaine Surfactants on the Wettability of a Poly(tetrafluoroethylene) Surface[J]. Acta Phys. -Chim. Sin. 2015, 31(4), 715-721. doi: 10.3866/PKU.WHXB201503028

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201503028

https://www.whxb.pku.edu.cn/CN/Y2015/V31/I4/715

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支链化阳离子和甜菜碱表面活性剂对聚四氟乙烯表面润湿性的影响

Effect of Branched Cationic and Betaine Surfactants on the Wettability of a Poly(tetrafluoroethylene) Surface

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