Cho, JC Kim, KH Kim, KU Kwak, S Kim, J Jo, WH Chun, MS Lee, CH Yeo, JK Quirk, RP 2024-01-21T16:44:22Z 2024-01-21T16:44:22Z 2021-09-03 1998-08 0887-624X https://pubs.kist.re.kr/handle/201004/142933 The most important variable affecting the yield in the coupling reactions of polymeric organolithium compounds with chlorosilane compounds has been investigated through size-exclusion chromatographic (SEC) analysis. The coupling reaction of poly(styryl)lithium with dichlorodimethylsilane as a silane-coupling agent provided 44 wt % of the coupling yield. The coupling yield, depending on the chain end reactivity of active polymers, was not greatly affected. The addition of a Lewis base such as N,N,N&apos;,N&apos;-tetramethylethylenediamine (TMEDA) even after complete polymerization of the dienes in hydrocarbon seems to affect the coupling reaction, resulting in decreasing the yield. The 1,2- or 3,4-enchain contents in the polydiene backbones affected the reduction of the linking efficiency in the coupling of the poly(dienyl)lithiums with chlorosilanes as the linking agent. The linking yields of the active polymers including over 75 mol % of 1,2- or 3,4-enchainment on the polydiene segment were below 20 wt %. The linking yields exhibited a dependence not only on the steric requirement of the chain end, but also the microstructure of the polydiene segment. (C) 1998 John Wiley & Sons, Inc. English WILEY-BLACKWELL Microstructure effect in the coupling reactions of polymeric organolithium compounds using chlorosilanes Article 10.1002/(SICI)1099-0518(199808)36:11<1743::AID-POLA7>3.0.CO;2-S 1 JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.36, no.11, pp.1743 - 1753 JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 36 11 1743 1753 N scie scopus 000074604700007 2-s2.0-0032143725 Polymer Science Polymer Science Article ANIONIC-POLYMERIZATION BLOCK COPOLYMERS LITHIUM ISOPRENE COMPLEXES CATALYSIS OLIGOMERS ACIDITIES BEHAVIOR STYRENE coupling reaction living polymer microstructure coupling yield 1,4-enchainment