caa a22 4500 465788629 CHVBK 20180323112017.0 cr unu---uuuuu 170327e19900201xx s 000 0 eng 10.1007/BF00338507 doi (NATIONALLICENCE)springer-10.1007/BF00338507 ESR studies of the interaction of propagating radicals with diacetylenes [Elektronische Daten] [Jimmy Hwang, Takeshi Ogawa] ESR studies were carried out for the polymerization systems of some vinyl monomers in the presence of diacetylenic compounds in order to determine the nature of interaction between the propagating radicals with the diacetylenes. The systems used in this study were methylmethacrylate, styrene and methylacrylate with diphenylbutadiyne and phenyl-4′-vinylphenylbutadiyne using 2,2′-azobisisobutyronitrile as an initiator. ESR spectra showed a broad triplet for the styrene system, which became exchange narrowed for the methylmethacrylate system. This is explained in terms of increased interaction between the propagating radicals and the diacetylene for methylmethacrylate than styrene. The propagating radicals are considered to be trapped temporalily by the diacetylenes during polymerization, but they do not react until the polymerization system becomes extreemly viscous. Springer-Verlag, 1990 Hwang Jimmy Department of Chemistry, King Fahd University of Petroleum and Minerals, 31261, Dhahran, Saudi Arabia aut Ogawa Takeshi Instituto de Investigación en Materiales, Universidad Nacional Autónoma de México, Del. Coyoacan, Ap. Postal 70-360 y-284, 04510, México, DF, México aut Polymer Bulletin Springer-Verlag 23/2(1990-02-01), 239-245 0170-0839 23:2<239 1990 23 289 https://doi.org/10.1007/BF00338507 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00338507 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hwang Jimmy Department of Chemistry, King Fahd University of Petroleum and Minerals, 31261, Dhahran, Saudi Arabia aut NATIONALLICENCE 700 1- Ogawa Takeshi Instituto de Investigación en Materiales, Universidad Nacional Autónoma de México, Del. Coyoacan, Ap. Postal 70-360 y-284, 04510, México, DF, México aut NATIONALLICENCE 773 0- Polymer Bulletin Springer-Verlag 23/2(1990-02-01), 239-245 0170-0839 23:2<239 1990 23 289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer