开发带有提欧-胺基联体的第四组金属复合物,以提高高温催化性能,以实现烯酸共聚化
Chuanhui Liu1, Wenzheng Feng1, Shaofeng Liu1
1Key Laboratory of Biobased Polymer Materials, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Inorganic chemistry
|October 4, 2024
概括
新的金属催化剂可提供高效的聚烯弹性体 (POE) 合成. 哈夫尼复合物显示出优越的活性和热稳定性以乙烯/1-奥克共聚合,使高价值聚合物生产成为可能.
科学领域:
- 有机金属化学 有机金属化学
- 聚合物科学 聚合物科学
- 催化剂是一种催化剂.
背景情况:
- 聚烯弹性体 (POE) 的高效合成需要高度活性和热稳定的同质金属催化剂.
- 溶液阶段的烯聚合是POE生产的关键工业过程.
研究的目的:
- 开发新型的哈夫 (Hf), (Zr) 和 (Ti) 金属复合物与乙烯-胺基联体,用于烯聚合.
- 研究金属中心和连接体结构对催化活性,热稳定性和聚合物特性的影响.
主要方法:
- 使用NMR光谱和X射线衍射合成和描述Hf,Zr和Ti复合体.
- 在高温下对乙烯/1-烯共聚合物的催化性能的评估.
- 对分子量,分布和共纳体结合等结果的多烯弹性体进行分析.
主要成果:
- 催化活性遵循了Hf > Zr > Ti的趋势.
- 在硫原子周围具有较少固体阻碍的配体提高了共聚合效率.
- 哈夫尼复合物Hf1表现出高活性 (21,060公斤(聚合物) ·mol-1 (Hf) ·h-1) 并在120°C时产生具有高分子量 (6.3×104gmol-1) 和34.1mol%的1-octene合并的POE.
结论:
- 量身定制的连接体设计对于开发用于POE合成的高效金属催化剂至关重要.
- 基于Hf的催化剂具有特定的乙烯-胺基连接物,显示出在生产高价值多烯弹性体方面显著的前景.
- 该研究强调了通过催化剂优化精确控制聚合物特性的潜力.
更多相关视频
相关概念视频
Olefin Metathesis Polymerization: Overview
2.0K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.0K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
1.9K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
1.9K
Metal-Ligand Bonds
20.6K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.6K
Complexation Equilibria: The Chelate Effect
472
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
472
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.5K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.5K
Properties of Organometallic Compounds
958
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
958


