Particle size and monomer partitioning in microemulsion polymerization. 2. Online small angle neutron scattering studies

被引:29
作者
Co, CC [1 ]
Kaler, EW [1 ]
机构
[1] Univ Delaware, Ctr Mol & Engn Thermodynam, Dept Chem Engn, Newark, DE 19716 USA
关键词
D O I
10.1021/ma971718a
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polymerization of n-hexyl methacrylate (C(6)MA) in aqueous microemulsions made with mixed dodecyltrimethylammonium bromide (DTAB) and didodecyldimethylammonium bromide (DDAB) surfactants yields very small (similar to 30 nm) latex particles of high molecular weight polymer. The results of an online small-angle neutron scattering (SANS) experiment have verified some of the assumptions of a simple but accurate kinetic model that has been recently proposed for aqueous microemulsion polymerization. The SANS results also support the predictions of an analytical model that describes the evolution of the chain length and particle size distribution throughout the polymerization. During the microemulsion polymerization of C(6)MA, the monomer does not significantly swell the polymer particles. A model of the reacting particle as a polymer core surrounded by a monomer-rich shell is consistent with both the kinetic and SANS data if the monomer concentration in the shell is equal to that in the core of the swollen micelles.
引用
收藏
页码:3203 / 3210
页数:8
相关论文
共 29 条
[1]   SMALL-ANGLE NEUTRON-SCATTERING STUDY OF THE STRUCTURAL EFFECTS OF SUBSTITUTION OF TETRAMETHYLAMMONIUM FOR SODIUM AS THE COUNTERION IN DODECYL-SULFATE MICELLES [J].
BERR, SS ;
COLEMAN, MJ ;
JONES, RRM ;
JOHNSON, JS .
JOURNAL OF PHYSICAL CHEMISTRY, 1986, 90 (24) :6492-6499
[2]  
BRANDRUP J, 1989, POLYM HDB, P85
[3]   AN EQUILIBRIUM THEORY FOR EXCLUSION CHROMATOGRAPHY OF BRANCHED AND LINEAR POLYMER CHAINS [J].
CASASSA, EF ;
TAGAMI, Y .
MACROMOLECULES, 1969, 2 (01) :14-+
[4]   EQUILIBRIUM DISTRIBUTION OF FLEXIBLE POLYMER CHAINS BETWEEN A MACROSCOPIC SOLUTION PHASE AND SMALL VOIDS [J].
CASASSA, EF .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER LETTERS, 1967, 5 (9PB) :773-&
[6]   HIGH-MOLECULAR-WEIGHT POLYMER SEGMENT DISTRIBUTION IN SMALL LATEX-PARTICLES [J].
DABDUB, D ;
KLEIN, A ;
SPERLING, LH .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1992, 30 (07) :787-789
[7]   POLYMER-SOLUTIONS NEAR AN INTERFACE .1. ADSORPTION AND DEPLETION LAYERS [J].
DEGENNES, PG .
MACROMOLECULES, 1981, 14 (06) :1637-1644
[8]  
GILBERT RG, 1995, EMULSION POLYM MECH, P59
[9]  
Glockner G., 1987, Polymer characterization by liquid chromatography
[10]   MOLECULAR WEIGHT DEVELOPMENT IN CONSTANT-RATE STYRENE EMULSION POLYMERIZATION [J].
GRANCIO, MR ;
WILLIAMS, DJ .
JOURNAL OF POLYMER SCIENCE PART A-1-POLYMER CHEMISTRY, 1970, 8 (10) :2733-&