The preparation and characterisation of polymer latices formed in the absence of surface active agents

Wiley - Tập 5 Số 5 - Trang 347-362 - 1973
James W. Goodwin1, J. Hearn1, CC Ho1, R. H. Ottewill1
1School of Chemistry, University of Bristol, Bristol, BS8 ITS

Tóm tắt

AbstractMethods have been devised for the formation of monodisperse polystyrene latices in the absence of added surface active agents. The particles are stabilised, as a colloidal dispersion, by surface groupings which are an integral part of the particle and are not removed by dialysis. By suitable variation of the ionic strength of the aqueous phase, the initiator concentration and the polymerisation temperature, the final particle size obtained in single‐stage reactions was varied between c. 0.15 and 1.0 μm. The coefficient of variation on particle diameters was usually less than 5%. The ionic strength of the aqueous phase was found to play an important part in determining particle size; this was explained in terms of a limited coagulation process occurring at the stage involving the nucleation of polymer particles. Conductometric titration experiments revealed the presence of sulphate, carboxyl and hydroxyl groups on the particle surfaces. Molecular weight determination of the polystyrene formed showed that this was lower than that formed in conventional emulsion polymerisation.

Từ khóa


Tài liệu tham khảo

Bovey F. A., 1955, Emulsion Polymerisation

van der Hoff B. M. E., 1967, Solvent Properties of Surfactant Solutions, 285

Vanderhoff J. W., 1970, Clean Surfaces: Their Preparation and Characterization for Interfacial Studies, 15

10.1007/BF01520398

10.1007/BF02085284

10.1007/BF01517273

Shaw J. N., 1969, J. Polym. Sci., 27, 237

10.1002/pi.4980020204

10.1002/pi.4980020205

10.1002/pi.4980020101

10.1007/978-1-4684-1920-7

10.1002/pol.1970.150080927

10.1002/pol.1957.1202410708

10.1021/ie50705a006

10.1002/pol.1950.120050407

10.1002/pi.4980020108

10.1007/BF02085916

10.1007/BF02160082

10.1016/0021-9797(68)90139-2

10.1002/pol.1966.150041213

10.1007/978-1-4684-1920-7_1

10.1007/BF01506246

Ho C. C.Ph.D. Thesis University of Bristol.1972.

Chen S. F.University of Bristol private communication.

10.1021/j100817a039

10.1021/ja01151a024

Mer V. K., 1952, Ind. Engng. Chem., 44, 1270, 10.1021/ie50510a027

Verwey E. J. W., 1948, Theory of the Stability of Hydrophobic Colloids

10.1039/df9664200154

10.1007/BF01341386

von Smoluchowski M., 1917, Z. phys. Chem., 92, 129

Medvedev S. S., 1957, Colln. Czech. chem. Commun., 160, 174

Medvedev S. S., 1963, Int. Symp. Macromolecules, 174

Goodwin J. W.;Ottewill R. H.;Vianello G.To be published.

10.1007/978-1-4684-1920-7_5

Thông tin
Thông tin xuất bản

Wiley

Tập 5 Số 5

347-362

Thông tin tác giả