caa a22 4500 475764994 CHVBK 20180406123603.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1007/s003960050025 doi (NATIONALLICENCE)springer-10.1007/s003960050025 Hao J. Physikalische Chemie I Universität Bayreuth D-95440 Bayreuth, Germany, DE aut Effect of the structures of microemulsions on chemical reactions [Elektronische Daten] [J. Hao] Two kinds of chemical reactions were studied in two different microemulsion systems: cetyltrimethylammonium bromide/1-butanol/10 and 25% n-octane/water and sodium dodecyl sulfonate/1-butanol/20% styrene/water. One reaction is a hydrolysis reaction, in which aspirin and 2,4-dinitrochlorobenzene were used as the hydrolysis substrates. The second reaction is the polymerization of styrene, which was initiated by using two initiators, water-soluble K2S2O8 and oil-soluble 2,2′-azobis(isobutyronitrile), and, at the same time, the polymerization of acrylamide, which was initiated by NaHSO3, was also studied. All the hydrolysis reaction experimental results show that the hydrolysis is greatly affected by the structures and the structural transitions of microemulsions. The hydrolysis rates are higher in water-in-oil (W/O) microemulsion media and decrease with the addition of water. The rates increase in bicontinuous (BC) microemulsions and decrease in oil-in-water (O/W) microemulsions. The transition points of the hydrolysis rates occurred at the two microemulsion structural transition points from W/O to BC and from BC to O/W. The polymerization relationships between the conversions of styrene, the molecular weights of polystyrene and the water contents of the microemulsion system were obtained. The effects of microemulsion structures on the sizes of the polystyrene particles and on the molecular weights of the polymers are discussed. Polystyrene particles with diameters of 10-60 nm were observed by microscopy. Our experimental polymerization results show that microemulsions are suitable as media for the production of polymers, the molecular weights and the particle sizes of which can be controlled and predicted by variations in microemulsion structures. Springer-Verlag Berlin Heidelberg, 2000 Key words Hydrolysis kinetics nationallicence Polymerization nationallicence Microemulsions nationallicence Aspirin nationallicence Styrene nationallicence https://doi.org/10.1007/s003960050025 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050025 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Hao J. Physikalische Chemie I Universität Bayreuth D-95440 Bayreuth, Germany, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer