摘要
采用小幅低频振荡和界面张力弛豫技术,研究了部分水解聚丙烯酰胺(Mo-4000)和阴离子表面活性剂2-丙基-4,5-二庚基苯磺酸钠(377)体系在癸烷/水界面上的扩张黏弹性质,并考察了电解质对体系界面流变性质的影响.研究结果发现,低表面活性剂浓度时,聚合物的加入大大降低了扩张模量;而高表面活性剂浓度时,聚合物的存在导致了界面膜更接近弹性膜.一方面电解质压缩双电层,增加界面膜的紧密程度,造成高频条件下扩张模量增大;另一方面,电解质增强表面活性剂分子在界面与体相间的扩散交换作用,增大了扩张模量的频率依赖性,造成低频条件下扩张模量降低.
The dilational viscoelastic properties of partly hydrolyzed polyacrylamide and alkyl benzene sulfo-nate in the absence or presence of electrolyte were investigated at the decane water interface by means of longitudinal method and the interfacial tension relaxation method.At low surfactant concentration,the addition of polymer could sharply decrease the dilational elasticity,while it may enhance the dilational elasticity at higher surfactant concentration.Addition of electrolyte possibly compresses the double layer,which leads to a higher dilational elasticity.On the other hand,it also possibly speeds up molecular exchange between the bulk and interface,which results in decreasing the dilational elasticity at low frequency.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第2期361-366,共6页
Chemical Journal of Chinese Universities
基金
国家科技重大专项项目(批准号:2008ZX05011)资助
关键词
扩张流变
部分水解聚丙烯酰胺
烷基苯磺酸盐
电解质溶液
Dilational rheology
Partly hydrolyzed polyacrylamide
Alkyl benzene sulfonate
Electrolyte solution
