Synthesis of Hyperbranched Polyisoprene by Isoprene/Dimethyl‐di‐2,4‐Pentadieneyl‐(E,E)‐Silane Copolymerization Catalyzed with Half‐Sandwich Scandium Complex,Macromolecular Chemistry and Physics

当前位置： X-MOL 学术 › Macromol. Chem. Phys. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Synthesis of Hyperbranched Polyisoprene by Isoprene/Dimethyl‐di‐2,4‐Pentadieneyl‐(E,E)‐Silane Copolymerization Catalyzed with Half‐Sandwich Scandium Complex
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-07-13 , DOI: 10.1002/macp.202000119
Jialin Yu ₁ , Hui Niu ₁ , Ke Yang ₁ , Hui Yu ₁ , Jing Wang ₁ , Tingting Li ₁ , Yang Li ₁

Affiliation

A series of hyperbranched polyisoprenes (HBPIps) are synthesized by copolymerization of isoprene and a novel dipentadiene‐containing branching agent dimethyl‐di‐2,4‐pentadieneyl‐(E,E)‐silane (DMDPS) catalyzed by the half‐sandwich scandium complex (C₅Me₄SiMe₃)Sc(CH₂C₆H₄NMe₂‐o)₂/[Ph₃C][B(C₆F₅)₄]. Due to the high activity of DMDPS in copolymerization, and the very similar reactivity of the two pentadieneyl groups in DMDPS, the gelation reaction is successfully avoided in the highly branched products. The structural parameter branching factor (g′) of the HBPIps is determined to evaluate the branching degree. It is proved that in the polymerization both the concentration of DMDPS and isoprene exhibits significant influence on branching degree of HBPIps. By using the DMDPS as branching agent and simply controlling the polymerization conditions, high branching degree of g′ = 0.35 is achieved.

中文翻译：

半夹心Scan络合物催化异戊二烯/二甲基二-2-2,4-戊二烯基-（E，E）-硅烷共聚反应合成超支化聚异戊二烯

通过半夹心and络合物催化异戊二烯与新型含双戊二烯的支化剂二甲基二-2-2,4-戊二烯基（E，E）-硅烷（DMDPS）的共聚反应，合成了一系列超支化聚异戊二烯（HBPIps）。（C ₅我₄森达₃）钪（CH ₂ ç ₆ ħ ₄ NME ₂ - ö）₂ / [PH ₃ C] [B（C ₆ ˚F ₅）₄]。由于DMDPS在共聚反应中的高活性，以及DMDPS中两个戊二烯基的反应性非常相似，因此在高支化产物中成功避免了凝胶化反应。确定HBPIps的结构参数分支因子（g '）以评估分支度。事实证明，在聚合反应中，DMDPS和异戊二烯的浓度均对HBPIps的支化度有显着影响。通过使用DMDPS作为支化剂并简单地控制聚合条件，可以实现高的支化度g ′＝ 0.35。

更新日期：2020-07-13

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11