5,6,7,8-tetrahydro-1-naphthol-phosphine post-transition metal complexes, preparation method therefor, and use thereof
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Solution Overview
Problem
Existing post-transition metal catalysts exhibit low ethylene polymerization activity at high temperatures and are inefficient in homopolymerizing ethylene or copolymerizing with acrylate monomers, with a complex and costly preparation method.
Innovation Solution
Development of 5,6,7,8-tetrahydro-1-naphthol-phosphine post-transition metal complexes with specific structural formulae, synthesized through a simplified process, demonstrating high thermal stability and ethylene polymerization activity, and effective copolymerization with acrylate monomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional post-transition metal catalysts are used, then the catalyst structure is established, but the ethylene polymerization activity is low at high temperatures
Solution Approach 1:
The patent modifies the ligand structure by introducing specific substituents (R1-R6) with different electronic and steric properties, and changes the metal center from conventional options to Cu(II), which fundamentally alters the catalyst's thermal stability and activity parameters, enabling high polymerization activity at elevated temperatures
Solution Approach 2:
The catalyst employs a composite ligand system combining phosphine (P(R1)(R2)3), amino (NR3R4), and hydroxyl (OH) functional groups in a specific molecular architecture, creating a multifunctional ligand environment that synergistically enhances both thermal stability and polymerization activity
2Adaptability or versatility
If conventional post-transition metal catalysts are used, then the catalyst is established, but the copolymerization capability with acrylate monomers is poor
Solution Approach 1:
The ligand design incorporates specific functional groups (amino and hydroxyl) at particular positions (R3, R4, and the hydroxyl group) that create localized electronic environments favorable for coordinating acrylate monomers, enhancing the catalyst's adaptability to different monomer types while maintaining reliable copolymerization performance
3Ease of manufacture
If conventional catalyst preparation methods are used, then the catalyst is synthesized, but the preparation process is complex and costly
Solution Approach 1:
The ligand is synthesized through a stepwise segmented approach using readily available starting materials (compounds of formulae II and III), breaking down the complex molecule into manageable synthetic stages that can be performed with standard laboratory equipment and procedures
Solution Approach 2:
The patent employs inexpensive, commercially available starting materials and reagents for catalyst synthesis, avoiding the need for expensive specialized compounds or equipment, thereby simplifying the preparation process and reducing costs while maintaining catalyst effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The complexes achieve high ethylene polymerization activity at elevated temperatures, produce polymers with narrower molecular weight distribution, and enable efficient copolymerization with acrylate monomers, offering a cost-effective and adjustable molecular mass production process.
Implementation Method 1
post-transition metal catalysts have attracted the widespread attention from thescientific community due to the advantages such as high ethylene homopolymerization activity
Implementation Method 2
the capability to perform the direct coordination and copolymerization with polar monomers via olefins
Data Source
AI summary
The present invention relates to the technical field of olefin polymerization catalysts. Disclosed are 5,6,7,8-tetrahydro-1-naphthol-phosphine post-transition metal complexes, a preparation method therefor, and the use thereof. The structure of the complexes is as shown in formula (I), in which R7-R11 are selected from hydrogen, halogens, hydroxyl, and substituted or unsubstituted C1-C15 hydrocarbyls, and R2 and R3 are selected from halogens, C1-C10 hydrocarbyls, P(R4)3, NR5R6 and OR12R13, wherein R4 is selected from substituted or unsubstituted C1-C10 hydrocarbyls, and R5, R6, R12 and R13 are selected from C1-C6 hydrocarbyls, or R5 and R6 are linked to N to form a five-membered ring or six-membered ring, or R12 and R13 are linked to O to form a five-membered ring or six-membered ring. Said complexes have good thermal stability, have relatively high ethylene polymerization activity at relatively high temperatures, and has a relatively good property of copolymerization with acrylate type monomers, prepared polymers having relatively good properties.