Oxo-nitrogenated Iron Complex for Diene Polymerization Microstructure Control
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Solution Overview
Problem
Current catalytic systems for the polymerization of conjugated dienes, such as polybutadiene and polyisoprene, struggle to produce polymers with specific mixed structures, particularly those with high 1,4-cis and 1,2 unit content or 1,4-cis and 3,4 unit content, which are desirable for various industrial applications like tire production.
Innovation Solution
A new oxo-nitrogenated iron complex with a specific general formula is introduced, which can be used in a catalytic system to produce polymers with a prevalent 1,4-cis and 1,2 unit content in polybutadiene and 1,4-cis and 3,4 unit content in polyisoprene, allowing for modulation of microstructure according to final uses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalytic systems (Ti, Co, Ni, Nd based) are used for polymerization, then high catalytic activity and stereospecificity are achieved, but the ability to produce polymers with specific mixed structures (high 1,4-cis and 1,2 unit content) is limited
Solution Approach 1:
The patent modifies the ligand structure parameters by introducing oxo-nitrogenated groups with specific substituents (R1-R6) that can be varied to tune catalyst activity and selectivity. By changing ligand parameters such as steric bulk and electronic properties, the catalyst can be optimized for producing polymers with high 1,4-cis and 1,2 unit content while maintaining versatility across different diene substrates
Solution Approach 2:
The catalytic system employs a composite approach by combining the oxo-nitrogenated iron complex with aluminum co-catalysts and optional additives. This composite catalyst system integrates multiple functional components that work synergistically to achieve both high stereospecificity and the ability to produce mixed-structure polymers, overcoming the limitations of single-component conventional catalysts
2Manufacturing precision
If iron-based catalysts with simple ligands are used, then the catalytic system is easier to manufacture, but the stereospecificity and ability to produce desired polymer structures are insufficient
Solution Approach 1:
The ligands are pre-synthesized with the desired oxo-nitrogenated structure and specific substituents before complexation with iron. This preliminary preparation ensures that the ligands have the optimal electronic and steric properties needed for high stereospecificity, allowing the final catalytic system to achieve superior polymer microstructure control without excessive complexity in the overall manufacturing process
Solution Approach 2:
The ligand design incorporates specific functional groups (oxo-nitrogenated groups with可调 substituents) at particular positions to create local electronic and steric environments that favor the formation of 1,4-cis and 1,2 units. This localized structural optimization enables high stereospecificity while keeping the overall catalyst system manageable in terms of manufacture
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 catalytic system effectively produces polymers with the desired mixed structures, achieving a content of 1,4-cis and 1,2 units or 1,4-cis and 3,4 units of at least 90%, suitable for applications in tires and shoe soles, by modulating the microstructure of conjugated diene copolymers.
Implementation Method 1
a catalytic system for the (co)polymerization of conjugated dienes comprising said oxo-nitrogenated iron complex
Data Source
AI summary
Oxo-nitrogenated iron complex having general formula (I): in which: R1 and R2, identical or different, represent a hydrogen atom; or they are selected from linear or branched, optionally halogenated C1-C20, preferably C1-C15, alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; R3 represents a hydrogen atom, or it is selected from linear or branched, optionally halogenated C1-C20, preferably C1-C15 alkyl groups, optionally substituted cycloalkyl groups, optionally substituted aryl groups; X, identical or different, represent a halogen atom such as, for example, chlorine, bromine, iodine, preferably chlorine; or they are selected from. linear or branched C1-C20, preferably C1-C15, alkyl groups, —OCOR4 groups or —OR4 groups in which R4 is selected from linear or branched C1-C20, preferably C1-C15, alkyl groups; n is 2 or 3. Said oxo-nitrogenated iron complex having general formula (I) can be advantageously used in a catalytic system for the (co)polymerization of conjugated dienes.