Dynamic surface tension of aqueous polymer solutions .1. Ethyl(hydroxyethyl)cellulose (BERMOCOLL cst-103)

被引:110
作者
Nahringbauer, I
机构
[1] Department of Physical and Inorganic Pharmaceutical Chemistry, Uppsala University, Uppsala Biomedical Center, S-751 23 Uppsala
关键词
EHEC; cellulose derivative; nonionic polymer; dynamic surface tension; relaxation times; kinetics; adsorption; mesophase; pendant-drop method;
D O I
10.1006/jcis.1995.9961
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The dynamic surface tension of aqueous solutions of ethyl(hydroxyethyl)cellulose (EHEC) was measured using the pendant-drop method and digital-image analysis. The EHEC concentrations studied ranged from 3.2 . 10(-5) to 0.28% w/w. The time dependence of surface tension was analyzed using a diffusion-kinetics-controlled theory where the adsorption kinetics depended on the fraction of the total surface coverage. For EHEC concentrations less than or equal to 10(-3)% w/w, the isotherms showing surface tension vs log time follow a sigmoidal pattern. Three consecutive kinetic regions exist: the induction region, the surface-coverage region, and the mesophase region. The process of the adsorption of polymer segments is described in terms of relaxation times and the critical points of time, at the onset and at the end of the region of surface coverage. An extremely slow surface equilibration in the mesophase region indicates a progressive ordering of the polymer segments within the surface layer. (C) 1995 Academic Press, Inc.
引用
收藏
页码:318 / 328
页数:11
相关论文
共 50 条
[1]  
ADAMSON AW, 1990, PHYSICAL CHEM SURFAC, P375
[2]   MEASUREMENT OF THE DYNAMIC SURFACE-TENSION IN AN ASYMMETRIC FREE-FALLING FILM [J].
BALBAERT, I ;
BLEYS, G ;
JOOS, P .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1987, 115 (02) :362-371
[4]   ADSORPTION-KINETICS OF BOLAFORM SURFACTANTS AT THE AIR WATER INTERFACE [J].
BLEYS, G ;
JOOS, P .
JOURNAL OF PHYSICAL CHEMISTRY, 1985, 89 (06) :1027-1032
[5]   ADSORBED SURFACE FILMS OF EGG ALBUMIN [J].
BULL, HB .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1972, 41 (02) :305-&
[6]   SURFACE-TENSION OF AQUEOUS HYDROXYPROPYL CELLULOSE SOLUTIONS [J].
CHANG, SA ;
GRAY, DG .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1978, 67 (02) :255-265
[7]  
COWIE JMG, 1973, POLYM CHEM PHYSICS M, P184
[8]   ADSORPTION BEHAVIOR OF PVA AT THE AIR-WATER-INTERFACE .1. APPLICABILITY OF THE GIBBS ADSORPTION EQUATION [J].
DEFEIJTER, JA ;
BENJAMINS, J .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1981, 81 (01) :91-107
[9]   SURFACE ACTIVITY OF A SERIES OF SYNTHETIC NON-IONIC DETERGENTS [J].
ELWORTHY, PH ;
MACFARLANE, CB .
JOURNAL OF PHARMACY AND PHARMACOLOGY, 1962, 14 :T100-+
[10]   TRANSFER OF SURFACE-ACTIVE AGENTS ACROSS A LIQUID-LIQUID INTERFACE [J].
ENGLAND, DC ;
BERG, JC .
AICHE JOURNAL, 1971, 17 (02) :313-&