Tuning of the exchange dynamics of unimers between block copolymer micelles with temperature, cosolvents, and cosurfactants

被引:74
作者
van Stam, J
Creutz, S
De Schryver, FC
Jérôme, R
机构
[1] Katholieke Univ Leuven, Dept Scheikunde, BE-3001 Heverlee, Belgium
[2] Univ Liege, CERM, BE-4000 Liege, Belgium
关键词
D O I
10.1021/ma992174a
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The dynamics of unimer exchange between aqueous micelles, formed by two amphiphilic block copolymers; i.e., poly(styrene-b-sodium methacrylate) and poly(tert-butylstyrene-b-sodium methacrylate), has been investigated by steady-state fluorescence spectroscopy. The kinetics are so slow at room temperature that no exchange could be detected over several hours, while at 60 degrees C the exchange rate constants could be estimated. These results Corroborate our previous findings that the rate is slowed down by increasing the hydrophobicity of the core. In addition to the temperature, the exchange can also be tuned by the addition of either a cosolvent or a cosurfactant. The efficiency of these additives to speed up the exchange process is related to their water solubility and their compatibility with the hydrophobic core of the micelles. The most pronounced effect on the exchange process is observed when the water solubility is low and the mixing of the additive with the hydrophobic core is favorable.
引用
收藏
页码:6388 / 6395
页数:8
相关论文
共 74 条
[1]   Poly(ethylene oxide) poly(propylene oxide) block copolymer surfactants [J].
Alexandridis, P .
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE, 1997, 2 (05) :478-489
[2]  
ALMBREN M, 1908, J AM CHEM SOC, V102, P3188
[3]  
ALMBREN M, 1996, LANGMUIR, V12, P3855
[4]   AGGREGATION OF POLY(ETHYLENE OXIDE)-POLY(PROPYLENE OXIDE)-POLY(ETHYLENE OXIDE) TRIBLOCK COPOLYMERS IN THE PRESENCE OF SODIUM DODECYL-SULFATE IN AQUEOUS-SOLUTION [J].
ALMGREN, M ;
VANSTAM, J ;
LINDBLAD, C ;
LI, PY ;
STILBS, P ;
BAHADUR, P .
JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (14) :5677-5684
[5]   SELF-AGGREGATION AND PHASE-BEHAVIOR OF POLY(ETHYLENE OXIDE) POLY(PROPYLENE OXIDE) POLY(ETHYLENE OXIDE) BLOCK-COPOLYMERS IN AQUEOUS-SOLUTION [J].
ALMGREN, M ;
BROWN, W ;
HVIDT, S .
COLLOID AND POLYMER SCIENCE, 1995, 273 (01) :2-15
[6]   DIRECT MEASUREMENT OF THE FORMATION TIME OF MIXED MICELLES [J].
CANTU, L ;
CORTI, M ;
SALINA, P .
JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (15) :5981-5983
[7]   FLUORESCENCE STUDIES OF AMPHIPHILIC POLY(METHACRYLIC ACID)-BLOCK-POLYSTYRENE-BLOCK-POLY(METHACRYLIC ACID) MICELLES [J].
CAO, T ;
MUNK, P ;
RAMIREDDY, C ;
TUZAR, Z ;
WEBBER, SE .
MACROMOLECULES, 1991, 24 (23) :6300-6305
[8]   ADSORPTION OF PHOTOACTIVE AMPHIPHILIC POLYMERS ONTO HYDROPHOBIC POLYMER-FILMS - POLYSTYRENE-BLOCK-POLY(2-VINYLNAPHTHALENE)-BLOCK-POLY(METHACRYLIC ACID) [J].
CAO, T ;
YIN, W ;
ARMSTRONG, JL ;
WEBBER, SE .
LANGMUIR, 1994, 10 (06) :1841-1847
[9]   TIME-RESOLVED FLUORESCENCE DEPOLARIZATION STUDIES OF NAPHTHALENE-LABELED DIBLOCK COPOLYMER MICELLES IN AQUEOUS-MEDIA [J].
CHAN, J ;
FOX, S ;
KISEROW, D ;
RAMIREDDY, C ;
MUNK, P ;
WEBBER, SE .
MACROMOLECULES, 1993, 26 (25) :7016-7023
[10]   STRUCTURE AND DYNAMICS OF POLYMERIC MICELLES IN SOLUTION [J].
CHU, B ;
ZHOU, ZK ;
WU, GW .
JOURNAL OF NON-CRYSTALLINE SOLIDS, 1994, 172 :1094-1102