Functionalized Elastomer Copolymerization via Lanthanide Catalyst
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Solution Overview
Problem
Current methods for copolymerizing 1,3-butadiene or isoprene with polar functionalized dienes lack control over microstructure, particularly in incorporating functional groups like primary amine groups, which are incompatible with existing catalytic systems, limiting the development of rubber materials with enhanced properties for tire applications.
Innovation Solution
A copolymerization process using a lanthanide-based coordination polymerization catalyst, specifically a neodymium-based system, to produce a copolymer with a high cis 1,4 microstructure, where 1,3-butadiene is copolymerized with polar functionalized dienes, allowing for the incorporation of phenylene and alkane diyl groups, and subsequent conversion to primary amine groups by methanol treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If free-radical methods are used for copolymerization of 1,3-butadiene or isoprene with polar functionalized dienes, then functional groups can be incorporated into the polymer, but control over the polymer's microstructure is lost
Solution Approach 1:
The patent changes the fundamental parameter of the polymerization mechanism from free-radical to coordination polymerization using lanthanide catalysts. This parameter change enables simultaneous achievement of both functional group incorporation and microstructure control, as the coordination mechanism allows stereoselective insertion while tolerating polar functional groups that would interfere with free-radical processes.
Solution Approach 2:
The patent introduces lanthanide-based coordination catalysts as intermediaries that mediate between the monomers and enable controlled polymerization. These catalysts act as intermediaries that can accommodate polar functional groups while maintaining control over the insertion stereochemistry, thus resolving the contradiction between functional group tolerance and microstructure control.
2Manufacturing precision
If existing catalytic systems are used, then microstructure control can be maintained, but polar functional groups like primary amine groups cannot be incorporated
Solution Approach 1:
The patent changes the catalyst system parameter from traditional Ziegler-Natta or organometallic catalysts to lanthanide-based coordination catalysts. This parameter change expands the functional group compatibility range to include polar groups like primary amines while preserving microstructure control capabilities through the coordination mechanism.
Solution Approach 2:
The lanthanide-based catalyst system exhibits universality by being able to handle both non-polar and polar functionalized dienes under the same catalytic conditions. This multi-functional catalyst system can incorporate diverse functional groups (including primary amines) while maintaining control over cis-1,4 microstructure, thus resolving the contradiction between microstructure control and functional group compatibility.
3Ease of manufacture
If simple in-situ catalyst systems are used, then ease of manufacture is improved, but functional group tolerance is limited
Solution Approach 1:
The patent employs lanthanide-based catalysts that exhibit universal functionality, enabling the simple in-situ catalyst system to tolerate a broad range of functional groups including polar groups like primary amines. This universal catalyst system maintains ease of manufacture through simple preparation while expanding functional group tolerance beyond what traditional catalysts can achieve.
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 process achieves a copolymer with high cis 1,4 microstructure content, enabling improved interactions with filler materials and enhanced properties for tire applications, such as improved glass transition temperature and strain-induced crystallization, while allowing for the incorporation of primary amine groups previously incompatible with catalytic systems.
Implementation Method 1
A copolymerization process using a lanthanide-based coordination polymerization catalyst, specifically a neodymium-based system, to produce a copolymer with a high cis 1,4 microstructure
Data Source
Figure 1
AI summary
The present invention is directed to functionalized elastomer given by the formula poly(M1 co M2) wherein M1 is a first monomer selected from the group consisting of 1,3-butadiene and isoprene and M2 is of formula II where R1 is phenylene, a linear or branched alkane diyl group containing from 1 to 10 carbon atoms, or a combination of one or more phenylene groups and one or more linear or branched alkane diyl groups containing from 1 to 10 carbon atoms.