Characterization of aqueous micellar solutions of amphiphilic block copolymers of poly(acrylic acid) and polystyrene prepared via ATRP.: Toward the control of the number of particles in emulsion polymerization

被引:99
作者
Burguière, C
Chassenieux, C
Charleux, B
机构
[1] Univ Paris 06, Lab Chim Polymeres UMR7610, F-75252 Paris 05, France
[2] UPMC, ESPCI, CNRS, UMR7615,Lab Physicochim Macromol, F-75231 Paris, France
关键词
amphiphilic block copolymers; atom transfer radical polymerization; emulsion polymerization;
D O I
10.1016/S0032-3861(02)00811-X
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A series of diblock, triblock and star-block copolymers composed of polystyrene and poly(acrylic acid) were synthesized by ATRP. The structure of the copolymers, the size of the blocks and the composition were varied, keeping however a short polystyrene block and a poly(acrylic acid) content larger than 60 mol% to allow solubility in alkaline water. Their micellization was studied by static and dynamic light scattering and the influence of their structural characteristics on the aggregation number, N-agg, was examined at low salt concentration and alkaline pH. It was shown that micelles were in thermodynamic equilibrium and that Nagg followed the power law N-agg similar to (NA-0.9NS2) (with N-A, the total number of acrylic acid units in the copolymer and N-S, the total number of styrene units), that is characteristic of amphiphile micelles formed from strongly segregated block copolymers. Moreover, N-agg was independent of salt concentration in the investigated range. The same copolymers were previously used as stabilizers in emulsion polymerization [Macromolecules 34 (2001) 4439]. The final latex particle concentration, N-p, was compared with N-m, the initial micelle concentration. This enabled us to conclude that among the block copolymers studied, those with high acid content behaved like low molar mass surfactants. In contrast, those with low acid content formed stable micelles that could be directly nucleated to create latex particles, allowing a good control over N-p. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:509 / 518
页数:10
相关论文
共 31 条
[1]   MICELLIZATION IN BLOCK POLYELECTROLYTE SOLUTIONS .2. FLUORESCENCE STUDY OF THE CRITICAL MICELLE CONCENTRATION AS A FUNCTION OF SOLUBLE BLOCK LENGTH AND SALT CONCENTRATION [J].
ASTAFIEVA, I ;
KHOUGAZ, K ;
EISENBERG, A .
MACROMOLECULES, 1995, 28 (21) :7127-7134
[2]   CRITICAL MICELLIZATION PHENOMENA IN BLOCK POLYELECTROLYTE SOLUTIONS [J].
ASTAFIEVA, I ;
ZHONG, XF ;
EISENBERG, A .
MACROMOLECULES, 1993, 26 (26) :7339-7352
[3]  
Berne B. J., 1976, DYNAMIC LIGHT SCATTE
[4]   Block copolymers of poly(styrene) and poly(acrylic acid) of various molar masses, topologies, and compositions prepared via controlled/living radical polymerization.: Application as stabilizers in emulsion polymerization [J].
Burguière, C ;
Pascual, S ;
Bui, C ;
Vairon, JP ;
Charleux, B ;
Davis, KA ;
Matyjaszewski, K ;
Bétremieux, I .
MACROMOLECULES, 2001, 34 (13) :4439-4450
[5]  
Burguiere C., 2001, THESIS U P M CURIE P
[6]  
Davis KA, 2000, J POLYM SCI POL CHEM, V38, P2274, DOI 10.1002/(SICI)1099-0518(20000615)38:12<2274::AID-POLA170>3.0.CO
[7]  
2-I
[8]   Structure of polyelectrolyte block copolymer micelles [J].
Förster, S ;
Hermsdorf, N ;
Böttcher, C ;
Lindner, P .
MACROMOLECULES, 2002, 35 (10) :4096-4105
[9]   Micellization of strongly segregated block copolymers [J].
Forster, S ;
Zisenis, M ;
Wenz, E ;
Antonietti, M .
JOURNAL OF CHEMICAL PHYSICS, 1996, 104 (24) :9956-9970
[10]   STATIC AND DYNAMIC LIGHT-SCATTERING BY AQUEOUS POLYELECTROLYTE SOLUTIONS - EFFECT OF MOLECULAR-WEIGHT, CHARGE-DENSITY AND ADDED SALT [J].
FORSTER, S ;
SCHMIDT, M ;
ANTONIETTI, M .
POLYMER, 1990, 31 (05) :781-792