Functional Copolymer Chain End Modification via Methacrylate Mediators
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Solution Overview
Problem
Current methods for modifying copolymers of 1,3-dienes and ethylene using coordination catalytic systems involving metallocenes face challenges due to numerous transfer reactions and the need for specialized, not commercially available, functional transfer agents, which complicates the introduction of functional groups at the chain end, affecting the polymer's properties.
Innovation Solution
A process involving the polymerization of 1,3-dienes and olefins with a metallocene-based catalytic system, followed by reaction with methacrylates to introduce a functional group at the chain end without forming a polymethacrylate block, allowing for the use of readily accessible and storable methacrylates, and subsequent chain termination and hydrolysis reactions to achieve functionalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functional transfer agents are used to modify chain ends of polymers synthesized by coordination catalytic systems, then functionalization can be achieved, but the process becomes complex due to the need for bespoke synthesis and special handling of these specialized agents
Solution Approach 1:
The patent uses methacrylates as intermediary compounds that react with the polymer chains during polymerization to introduce functional groups at chain ends. These methacrylates serve as mediators between the polymerization process and the desired functionalization, avoiding the need for specialized transfer agents while achieving reliable functional group introduction at chain ends
Solution Approach 2:
The patent changes the chemical parameters of the polymerization system by introducing methacrylate monomers with specific functional groups (amine, ether, vinyl, carboxylic acid, hydroxyl) into the coordination polymerization process. This parameter change allows the use of commercially available methacrylates instead of specialized transfer agents, simplifying the overall process while maintaining functionalization efficiency
2Reliability
If a block of a second polymer is introduced at the chain end by subsequent polymerization, then functionalization is achieved, but the intrinsic properties of the copolymer such as glass transition temperature are modified
Solution Approach 1:
The patent extracts only the essential functional group from the second polymer (polymethacrylate) and introduces it directly as a pendant group or chain-end functionality without incorporating the entire polymer block. This selective extraction of the functional component avoids the unwanted modification of intrinsic properties like glass transition temperature while maintaining the desired functionalization capability
Solution Approach 2:
The patent applies functionalization locally at the chain end or as pendant groups rather than introducing a large polymer block that would affect the bulk properties. By concentrating the functional groups at specific locations (chain ends) rather than distributing them throughout a polymer block, the intrinsic properties of the copolymer backbone are preserved while achieving the desired functionalization
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
This method allows for the preparation of copolymers with functional groups at the chain end without altering intrinsic properties like glass transition temperature, using commercially available reagents and simplifying the functionalization process.
Implementation Method 1
polymerization of 1,3-dienes and olefins with a metallocene-based catalytic system
Implementation Method 2
reaction with methacrylates to introduce a functional group at the chain end
Implementation Method 3
subsequent chain termination and hydrolysis reactions to achieve functionalization
Data Source
AI summary
A copolymer of a 1,3-diene and of an olefin is provided. The copolymer bears, at one of its chain ends, a functional group of formula —CH2—CH(CH3)—COOZ, Z being a hydrogen atom or a carbon-comprising group. A process of preparation of the copolymer is also provided. The olefin is ethylene or a mixture of ethylene and of an α-monoolefin.