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The resulting poly[(1,4\u2010<jats:italic>trans<\/jats:italic>\u2010isoprene)\u2010<jats:italic>co<\/jats:italic>\u2010styrene] exhibits quite narrow molecular weight distributions, up to 30% inserted styrene, and a 96\u201398% 1,4\u2010<jats:italic>trans<\/jats:italic>\u2010microstructure. The presence of a bulky and electron\u2010rich ligand in the coordination sphere of the metal leads to an increase of the amount of styrene inserted and narrower chemical composition and molecular weight distributions. The presence of significant quantities of styrene in the medium does not alter the selectivity of the reaction, in contrast with <jats:italic>cis<\/jats:italic>\u2010specific polymerizations.<\/jats:p><jats:p><jats:boxed-text content-type=\"graphic\" position=\"anchor\"><jats:graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mimetype=\"image\/gif\" position=\"anchor\" specific-use=\"enlarged-web-image\" xlink:href=\"graphic\/mgra001.gif\"><jats:alt-text>magnified image<\/jats:alt-text><\/jats:graphic><\/jats:boxed-text>\n<\/jats:p>","DOI":"10.1002\/macp.200700055","type":"journal-article","created":{"date-parts":[[2007,4,27]],"date-time":"2007-04-27T14:16:24Z","timestamp":1177683384000},"page":"973-978","source":"Crossref","is-referenced-by-count":33,"title":["A New Family of Styrene\/Diene Rubbers"],"prefix":"10.1002","volume":"208","author":[{"given":"Philippe","family":"Zinck","sequence":"first","affiliation":[]},{"given":"Micha\u00ebl","family":"Terrier","sequence":"additional","affiliation":[]},{"given":"Andr\u00e9","family":"Mortreux","sequence":"additional","affiliation":[]},{"given":"Andreia","family":"Valente","sequence":"additional","affiliation":[]},{"given":"Marc","family":"Visseaux","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2007,4,27]]},"reference":[{"key":"e_1_2_7_1_2","doi-asserted-by":"publisher","DOI":"10.1002\/pol.1973.170111012"},{"key":"e_1_2_7_2_2","doi-asserted-by":"publisher","DOI":"10.1081\/MC-120025979"},{"key":"e_1_2_7_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja01216a504"},{"key":"e_1_2_7_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja01516a021"},{"key":"e_1_2_7_5_2","doi-asserted-by":"publisher","DOI":"10.1002\/cjoc.20040220730"},{"key":"e_1_2_7_6_2","unstructured":"\u00a0"},{"key":"e_1_2_7_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/0032-3861(96)81109-8"},{"key":"e_1_2_7_8_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1099-0518(19980930)36:13<2283::AID-POLA15>3.0.CO;2-6"},{"key":"e_1_2_7_9_2","doi-asserted-by":"publisher","DOI":"10.1002\/marc.1995.030161101"},{"key":"e_1_2_7_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3927(20011201)22:18<1493::AID-MARC1493>3.0.CO;2-9"},{"key":"e_1_2_7_11_2","unstructured":"\u00a0"},{"key":"e_1_2_7_12_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma00043a034"},{"key":"e_1_2_7_13_2","doi-asserted-by":"publisher","DOI":"10.1002\/pola.10631"},{"key":"e_1_2_7_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0014-3057(00)00138-5"},{"key":"e_1_2_7_15_2","doi-asserted-by":"publisher","DOI":"10.1002\/app.1826"},{"key":"e_1_2_7_16_2","unstructured":"EP 416 815 (1990) Dow Chemical Co. invs.:J. 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