1999
DOI: 10.1016/s0014-3057(98)00126-8
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Modelling of the butadiene and isoprene polymerization processes with a binary neodymium-based catalyst

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Cited by 42 publications
(28 citation statements)
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“…Besides sophisticated Nd‐based catalyst/MAO or borate catalyst systems, traditional Ziegler‐Natta type Nd‐based compound/alkylaluminum catalyst systems have also been reported to possess some “living” characteristics,34–37 called “partially living” or “quasi‐living.” Chain termination caused by β‐H elimination/transfer is absent due to the monomer insertion occurring in the Nd‐π‐η 3 ‐allyl bond, unlike that in metal‐C σ‐bond in olefin polymerization. It is irreversible chain transfer reaction to alkylaluminum which causes polymerization behaviors deviate from that of typical living polymerization and broadens MWD of the polymer as a consequence.…”
Section: Introductionmentioning
confidence: 99%
“…Besides sophisticated Nd‐based catalyst/MAO or borate catalyst systems, traditional Ziegler‐Natta type Nd‐based compound/alkylaluminum catalyst systems have also been reported to possess some “living” characteristics,34–37 called “partially living” or “quasi‐living.” Chain termination caused by β‐H elimination/transfer is absent due to the monomer insertion occurring in the Nd‐π‐η 3 ‐allyl bond, unlike that in metal‐C σ‐bond in olefin polymerization. It is irreversible chain transfer reaction to alkylaluminum which causes polymerization behaviors deviate from that of typical living polymerization and broadens MWD of the polymer as a consequence.…”
Section: Introductionmentioning
confidence: 99%
“…Nos sistemas convencionais à base de titânio, cobalto e níquel, o peso molecular aumenta linearmente com a conversão até 30 a 40%, podendo então estabilizar ou sofrer um ligeiro declínio. Já nos sistemas à base de neodímio [13][14][15][16] , o peso molecular cresce linearmente com a conversão em toda a extensão da reação, comportando-se como uma polimerização "quase viva". Como as características de peso molecular estão relacionadas diretamente com as propriedades físicas (Mw) e com a processabilidade do material polimérico (Mw/Mn), a possibilidade de se produzir um polímero com peso molecular desejado, confere maior flexibilidade aos sistemas à base de neodímio em relação aos demais.…”
Section: Pr Pr Pr Pr Propriedades Físicas Do Polibutadieno Alto Oprieunclassified
“…Esse efeito só é observado quando são usados valores muito altos para a razão cocatalisador/catalisador. Isso mostra uma utilidade adicional do organoalumínio como seqüestrante de impurezas [11] .…”
Section: Influência Da Razão Molar Al/ndunclassified