不同反离子双癸基季铵盐对聚四氟乙烯表面的吸附行为

doi:10.3969/j.issn.1001-1803.2021.08.005

摘要/Abstract

摘要：

利用座滴法研究了系列反离子双癸基季铵盐和Gemini型季铵盐表面活性剂对超疏水材料聚四氟乙烯（PTFE）表面的吸附行为。考察了表面活性剂的表面活性、类型和浓度对接触角的影响规律,并探讨了铺展系数、黏附张力和黏附功的变化规律。研究表明：双癸基季铵盐表面活性剂在PTFE表面的接触角随着反离子基团的增大呈现先减小后增大的趋势,其中反离子最大的双癸基二甲基戊酸铵（DDAV）在PTFE表面的润湿效果最好;铺展系数（S）随着反离子有机酸基团的增大呈现先减小后增大的趋势;当表面活性剂的质量浓度低于cmc时,粘附力和表面张力之间呈现出良好的线性关系;当质量浓度大于cmc时,反离子基团小的表面活性剂溶液在固-液界面和气-液界面形成了饱和吸附层。反离子基团较大的表面活性剂在气-液界面达到饱和吸附,但在固-液界面上没有达到饱和,随着浓度的增加继续吸附,润湿性能增强。

关键词: 季铵盐, 表面活性剂, 吸附, 润湿, 接触角

Abstract:

The sessile drop method was used to study the adsorption behaviors of a series of didecyl quaternary ammonium salts with different counterions and a Gemini quaternary ammonium salt on the surface of superhydrophobic material polytetrafluoroethylene （PTFE）. The effects of the surface activity, type and concentration of surfactants on the contact angle were investigated, and the changes of spreading coefficient, adhesion tension and adhesion work were discussed. The results show that the contact angle of didecyl quaternary ammonium salts on the surface of PTFE shows a trend of first decreasing and then increasing with the increase of size of counterions. Among them, didecyldimethylammonium valerate （DDAV） which has the largest counterion shows the best wetting on the surface of PTFE; the spreading coefficient （S） is decreased first and then increased with the increase of counterion size; when the concentration of the surfactant is lower than cmc, there is a good linear relationship between adhesion and surface tension; when the concentration is larger than the cmc, the solution of the surfactant with small counterion forms a saturated adsorption layer at the solid-liquid interface and the gas-liquid interface. Surfactants with larger counterions reach saturation adsorption at the gas-liquid interface, but do not reach saturation at the solid-liquid interface. Their adsorption continues and the wetting performance is enhanced with the increase of concentration. Therefore, the influences of a series of didecyl quaternary ammonium salts on the surface of PTFE were obtained, and the adsorption model was established, which provided a theoretical basis for further understanding of the adsorption of such surfactants on the surface of hydrophobic materials, and facilitated the application of such surfactants.

Key words: quaternary ammonium salt, surfactant, adsorption, wetting, contact angle

中图分类号:

TQ423

智丽飞,石秀芳,张二壮,李晓明,王慧,潘瑞丽. 不同反离子双癸基季铵盐对聚四氟乙烯表面的吸附行为[J]. 日用化学工业, 2021, 51(8): 725-733.

Zhi Lifei,Shi Xiufang,Zhang Erzhuang,Li Xiaoming,Wang Hui,Pan Ruili. Adsorption behaviors of didecyl quaternary ammonium salts with different counterions on polytetrafluoroethylene surface[J]. China Surfactant Detergent & Cosmetics, 2021, 51(8): 725-733.

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表面活性剂	DDAF	DDAP	DDAB	DDAV	DDAC	DMHAC10	GC-A
cmc/（mg·mL^-1）	0.145 6	0.455 6	0.431 3	0.425 3	0.259 2	0.366 9	0.242 6
γ_cmc/（mN·m^-1）	24.58	29.14	27.32	25.89	25.04	27.03	31.12

表面活性剂	a	b	R
DDAF	-0.798 4	16.344 9	0.997 7
DDAP	-1.122 5	33.678 8	0.970 7
DDAB	-0.875 9	17.899 2	0.983 5
DDAV	-0.915 9	24.838 8	0.968 8
DDAC	-0.718 2	17.584 6	0.952 2
DMHAC10	-0.718 2	17.584 6	0.959 8
GC-A	-0.739 4	14.162 9	0.989 2