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Keywords = polyconjugated dienes

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8 pages, 2347 KiB  
Article
Synthesis of Stereodiblock Polybutadiene Using Cp*Nd(BH4)2(thf)2 as a Catalyst
by Ryo Tanaka, Yuto Shinto, Yuushou Nakayama and Takeshi Shiono
Catalysts 2017, 7(10), 284; https://doi.org/10.3390/catal7100284 - 25 Sep 2017
Cited by 12 | Viewed by 6167
Abstract
Butadiene polymerization, in both a highly cis- and trans-specific manner, was achieved by using a Cp*Nd(BH4)2(thf)2–Bu2Mg system as an initiator. The cis-/trans- ratio can be tuned by the amount of [...] Read more.
Butadiene polymerization, in both a highly cis- and trans-specific manner, was achieved by using a Cp*Nd(BH4)2(thf)2–Bu2Mg system as an initiator. The cis-/trans- ratio can be tuned by the amount of trialkylaluminum-depleted modified methylaluminoxane (dMMAO). The cis-regularity of the polymer was much higher than those obtained by Nd(BH4)3(thf)3. The molecular weight of cis-regular polymer was increased according to polymer yield, showing that there was no termination or chain transfer reaction during the polymerization. Synthesis of stereodiblock polybutadiene, which showed a high melting temperature (Tm) compared with stereodiblock polyisoprene, was also performed by the addition dMMAO during the polymerization. Full article
(This article belongs to the Special Issue Catalysts for the Controlled Polymerization of Conjugated Dienes)
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