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首页> 外文期刊>Macromolecules >Living Coordinative Chain-Transfer Polymerization and Copolymerization of Ethene, alpha-Olefins, and alpha,omega-Nonconjugated Dienes using Dialkylzinc as 'Surrogate' Chain-Growth Sites
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Living Coordinative Chain-Transfer Polymerization and Copolymerization of Ethene, alpha-Olefins, and alpha,omega-Nonconjugated Dienes using Dialkylzinc as 'Surrogate' Chain-Growth Sites

机译:以二烷基锌为“替代”链增长点的乙烯,α-烯烃和α,ω-非共轭二烯的活性配位链转移聚合和共聚

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摘要

Highly efficient, rapid, and reversible chain transfer between active transition-metal-based propagating centers derived from {Cp*Hf(Me)[N(Et)C(Me)N(Et)]}[B(C6F5)(4)] (Cp* = eta(5)-C5Me5) (1a) or {Cp*Hf(Me)[N(Et)-C(Me)N(Et)]} [B(C6F5)(3)Me] (1b) and multiple equivalents of diatkylzinc (ZnR2) acting as "surrogate" chain-growth sites has been achieved for establishing the living coordinative chain-transfer polymerization (CCTP) of ethene, alpha-olefins, and alpha,omega-nonconjugated dienes and living CCTP copolymerization of ethene with alpha-olefins and alpha,omega-nonconjugated dienes. These living CCTP processes not only provide a work-around solution to the "one chain per metal" cap on product yield currently limiting traditional living coordination polymerization of ethene and alpha-olefins but, in addition, provide access to practical volumes of a variety of unique new classes of precision polyolefins of tunable molecular weights and very narrow polydispersity (M-w/M-n <= 1.1).
机译:从{Cp * Hf(Me)[N(Et)C(Me)N(Et)]} [B(C6F5)(4)派生的基于过渡金属的活性扩散中心之间的高效,快速和可逆链转移](Cp * = eta(5)-C5Me5)(1a)或{Cp * Hf(Me)[N(Et)-C(Me)N(Et)]} [B(C6F5)(3)Me]( 1b),并且已经获得了多个当量的用作“替代”链增长位点的二烷基锌(ZnR2),用于建立乙烯,α-烯烃以及α,ω-非共轭二烯和活性化合物的活性配位链转移聚合(CCTP)乙烯与α-烯烃和α,ω-非共轭二烯的CCTP共聚。这些活性CCTP流程不仅为目前限制乙烯和α-烯烃的传统活性配位聚合的产品收率提供了“每种金属一条链”上限的解决方案,而且此外,还提供了各种实际用量的途径。独特的新型新型精密聚烯烃,具有可调的分子量和非常窄的多分散性(Mw / Mn <= 1.1)。

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