caa a22 4500 475764293 CHVBK 20180406123600.0 cr unu---uuuuu 170329e20001001xx s 000 0 eng 10.1007/s003960000340 doi (NATIONALLICENCE)springer-10.1007/s003960000340 Polymerisation of vinyl acetate in microemulsions with methanol [Elektronische Daten] [D. Donescu, L. Fusulan, C. Petcu, A.-G. Boborodea, D.-S. Vasilescu]  The homogeneity domains for the system vinyl acetate - methanol - monomaleate of nonylphenol ethoxylated with 25 mol ethylene oxide as an aqueous solution (MEMNPEO25) (33%) have been studied; it has been shown that, due to the shorter chain of methanol, these domains are more reduced than in the case of ethanol. The changes in refractive indexes and electrical conductivities have shown the formation of microemulsions with different structures (water-in-oil, bicontinuous or oil-in-water). Ammonium persulphate is soluble only in oil-in-water or in bicontinuous microemulsions. The initial polymerisation rates as well as the decomposition rates for the initiator are apparently affected when the microemulsion structure is modified. The polymerisation rate of vinyl acetate is higher in the presence of methanol than in the presence of ethanol for similar compositions; this fact may be attributed to a higher degree of ionisation of the initiator in the presence of methanol. Also, in polymerisations initiated by benzoyl peroxide, the conversions are influenced by the microstructure; thus, the maximum corresponds to water-in-oil microemulsions. By measuring the amount of unreacted MEMNPEO25 (gel permeation chromatography) we were able to show that the copolymer formed consisted of vinyl acetate and reactive surfactant. Springer-Verlag Berlin Heidelberg, 2000 Key words Microemulsions nationallicence Vinyl acetate nationallicence Methanol nationallicence Donescu D. Institute for Chemical Research Department of Polymer Syntheses 202 Splaiul Independentei 77208 Bucharest, Romania, RO aut Fusulan L. Institute for Chemical Research Department of Polymer Syntheses 202 Splaiul Independentei 77208 Bucharest, Romania, RO aut Petcu C. Institute for Chemical Research Department of Polymer Syntheses 202 Splaiul Independentei 77208 Bucharest, Romania, RO aut Boborodea A.-G University "Politehnica” of Bucharest Laboratory of Polymer Physics 149 Calea Victoriei, Bucharest, Romania, RO aut Vasilescu D.-S University "Politehnica” of Bucharest Laboratory of Polymer Physics 149 Calea Victoriei, Bucharest, Romania, RO aut https://doi.org/10.1007/s003960000340 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960000340 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Donescu D. Institute for Chemical Research Department of Polymer Syntheses 202 Splaiul Independentei 77208 Bucharest, Romania, RO aut NATIONALLICENCE 700 1- Fusulan L. Institute for Chemical Research Department of Polymer Syntheses 202 Splaiul Independentei 77208 Bucharest, Romania, RO aut NATIONALLICENCE 700 1- Petcu C. Institute for Chemical Research Department of Polymer Syntheses 202 Splaiul Independentei 77208 Bucharest, Romania, RO aut NATIONALLICENCE 700 1- Boborodea A.-G University "Politehnica” of Bucharest Laboratory of Polymer Physics 149 Calea Victoriei, Bucharest, Romania, RO aut NATIONALLICENCE 700 1- Vasilescu D.-S University "Politehnica” of Bucharest Laboratory of Polymer Physics 149 Calea Victoriei, Bucharest, Romania, RO aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer