摘要
研究了聚乙二醇-马来松香-聚乙二醇三嵌段共聚物和聚乙二醇-聚丙二醇-聚乙二醇三嵌段共聚物(P123)表面活性剂在水-空气表面的吸附行为并对结构的影响进行了评价。考察了不同结构对吸附行为的影响,包括临界胶束浓度(CMC),形态转变和吸附量。利用再定向理论研究了聚氧乙烯基表面活性剂在水-空气表面的吸附和形态转变过程。随着表面活性剂浓度的增加,在水-空气表面溶剂的物质的量分数降低,表面活性剂在水-空气界面上的物质的量分数增加。计算了吸附在表面上的两种状态表面活性剂的吸附量。吸附的自由能远小于胶束形成的自由能,表明表面活性剂优先吸附在表面上,达到饱和后就形成胶束。
The influence of structural properties on the adsorption behaviors of polyoxyethylene-maleated rosin-polyoxyethylene copolymer and polyethylene-polypropylene glycol-polyethylene(P123)surfactants was evaluated.The effects of structure on adsorption behavior including critical micelle concentration(CMC),morphological change,and adsorption capacity were investigated.Reorientation theory was put forward to depict the adsorption and the morphological transformation for polyoxyethylene-based surfactants on interface between water and air.The solvent molar fraction decreased and that of surfactant molecules increased as copolymer concentration increased.The amount of two state surfactants adsorbing on the surface were calculated.The free energy of adsorption is far less than the energy of micellar formation,indicating the surfactants are preferably adsorbed on the surface and shaped into micelles once saturated adsorptions are achieved.
作者
蓝艳姣
邹梦君
黄钦
赵彦芝
许海棠
周菊英
LAN Yan-jiao;ZOU Meng-jun;HUANG Qina;ZHAO Yan-zhi;XU Hai-tang;ZHOU Ju-ying(School of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Nanning 530006,China;Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,Guangxi University for Nationalities,Nanning 530006,China;Key Laboratory of Guangxi Colleges and Universities for Food Safety and Pharmaceutical Analytical Chemistry,Guangxi University for Nationalities,Nanning 530006,China)
出处
《化学试剂》
CAS
北大核心
2020年第7期845-851,共7页
Chemical Reagents
基金
广西自然科学基金资助项目(2018GXNSFAA-281243)
广西高等学校千名中青年骨干项目(2018年第2期)
广西科技基地和人才专项项目(AD18126005)。
关键词
聚氧乙烯基表面活性剂
界面
吸附行为
结构
形态转变
polyoxyethylene-based surfactant
surface
adsorption behavior
structure
morphological change
