Multifunctional Chain Shuttling Agents for Polyolefin Synthesis
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Solution Overview
Problem
There is a need for new chain shuttling agents and processes to prepare polyolefins, end functional polyolefins, and telechelic polyolefins, as well as amphiphilic diblock and multiblock copolymers, with existing methods lacking in efficiency and versatility in continuous polymerization processes.
Innovation Solution
A multifunctional chain shuttling agent is introduced, capable of functioning as both a chain shuttling and polymerization initiating agent, comprising metal-containing moieties separated by a polyvalent linking group, allowing for the transfer of olefin-containing polymeryl chains between catalytic sites and initiation of non-olefin polymerization reactions, with the ability to incorporate protecting groups and initiate polyester, polyether, or polyamide forming reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional chain shuttling agents are used in continuous polymerization processes, then polymer chains can be transferred between catalytic sites, but the process lacks versatility in initiating non-olefin polymerization reactions and producing end-functional polyolefins
Solution Approach 1:
The chain shuttling agent is designed with multiple functional moieties including chain shuttling groups (metal alkyl complexes), polymerization initiating groups (for polyester, polyether, or polyamide formation), and protecting groups. This multi-functional design enables a single agent to perform chain transfer, initiate diverse polymerization reactions, and provide end-functionality, thereby resolving the contradiction between versatility and structural complexity by integrating multiple functions into one molecule.
Solution Approach 2:
The patent combines previously separate functions (chain shuttling, polymerization initiation, and end-functionalization) into a single integrated chain shuttling agent molecule. By merging these functions, the system achieves greater versatility without requiring multiple separate reagents or process steps, effectively managing the complexity- versatility trade-off.
2Productivity
If multifunctional chain shuttling agents with multiple metal-containing moieties are used, then both chain shuttling and polymerization initiation can occur, but the manufacturing complexity increases
Solution Approach 1:
The multifunctional chain shuttling agent is constructed by segmenting different functional groups (chain shuttling moieties, polymerization initiating moieties, protecting groups) that can be independently designed and synthesized, then combined through metal-ligand coordination. This segmentation allows each functional group to be optimized separately while maintaining overall efficiency, addressing the contradiction between productivity and ease of manufacture.
3Manufacturing precision
If chain shuttling transfers polymer chains between catalytic sites, then polydispersity is achieved, but the process requires complex catalyst systems with multiple active sites
Solution Approach 1:
The chain shuttling agent acts as an intermediary that mediates polymer chain transfer between different catalytic sites. By introducing this intermediary species, the system achieves precise control over molecular weight distribution and polydispersity without requiring direct complex interactions between multiple catalysts, thereby reducing the effective complexity of the catalyst system while maintaining manufacturing precision.
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 multifunctional chain shuttling agent enables the production of polyolefins and copolymers with unique characteristics, such as polydispersity, and facilitates the preparation of telechelic and end-functional polyolefins, amphiphilic diblock, and multiblock copolymers, offering improved properties and applications in various industrial uses.
Implementation Method 1
Exchange or redistribution reactions of metal-ligand (e.g., alkylaluminums, aryloxyaluminums, alkylzincs, alkoxyzincs, and the like) complexes containing or derived polymerization catalysts are known.
Implementation Method 2
a non-olefin polymerization reaction can be initiated by the multifunctional chain shuttling agent
Data Source
AI summary
The invention generally relates to chain shuttling agents (CSAs), a process of preparing the CSAs, a composition comprising a CSA and a catalyst, a process of preparing the composition, a processes of preparing polyolefins, end functional polyolefins, and telechelic polyolefins with the composition, and the polyolefins, end functional polyolefins, and telechelic polyolefins prepared by the processes.