Silica‐Grafted Neodymium Catalysts for the Production of Ultrahigh‐Molecular‐Weight cis‐1,4‐Polyisoprene,ChemCatChem

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Silica‐Grafted Neodymium Catalysts for the Production of Ultrahigh‐Molecular‐Weight cis‐1,4‐Polyisoprene
ChemCatChem ( IF 3.8 ) Pub Date : 2018-02-21 , DOI: 10.1002/cctc.201701830
Erwan Le Roux ₁ , Yucang Liang ₂ , Reiner Anwander ₂

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Supported neodymium‐based Ziegler‐type catalysts are obtained by grafting homoleptic methylaluminate Nd(AlMe₄)₃ onto high‐surface silica materials including periodic mesoporous silicas MCM‐41, SBA‐15, and KIT‐6. Low [Et₂AlCl]‐cocatalyst contents allow for the fabrication of polyisoprenes with ultrahigh molecular weight (UHMWPI). The synthetic rubbers display molecular weights as high as 3×10⁶ g mol⁻¹, polydispersity indices as low as 1.2, and microstructures with 99 % cis‐stereospecificity. Combined analysis of the organolanthanide/silica hybrid materials by nitrogen physisorption, FTIR and magic angle spinning NMR spectroscopies, and elemental (metal) analysis assist in elucidating the intrapore surface organometallic chemistry and suggest the formation of unprecedented organolanthanide species.

中文翻译：

二氧化硅接枝的钕催化剂用于生产超高分子量的顺式1,4-聚异戊二烯

负载型钕基齐格勒型催化剂是通过将均相的甲基铝酸盐Nd（AlMe ₄）₃接枝到高表面二氧化硅材料上，包括周期性介孔二氧化硅MCM-41，SBA-15和KIT-6。较低的[Et ₂ AlCl]-助催化剂含量可以制备具有超高分子量（UHMWPI）的聚异戊二烯。合成橡胶显示出高达3×10 ⁶ g mol ^-1的分子量，低至1.2的多分散指数以及99％顺式的微观结构立体特异性。通过氮物理吸附，FTIR和魔角旋转NMR光谱对有机镧系元素/二氧化硅杂化材料的组合分析，以及元素（金属）分析有助于阐明孔内表面的有机金属化学性质，并提示形成了前所未有的有机镧系元素。

更新日期：2018-02-21

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