Silyl Hydride Functionalized Polymers for Thermo-Oxidative Stability
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Solution Overview
Problem
Current methods for obtaining in-chain functionalized polymers are inefficient, often requiring protective groups, costly deprotection steps, and limited control over functional group placement, which affects the stability and applicability of the polymers in thermally demanding environments.
Innovation Solution
A method involving the polymerization of alkenyl aromatic and conjugated diene monomers with silyl hydride units, followed by hydrogenation and hydrosilylation reactions, allowing for controlled introduction of functional groups along the polymer chain, enhancing thermo-oxidative stability and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functionalized initiators are used in living anionic polymerizations, then chain-end functionalized polymers can be obtained, but additional protection and deprotection reactions are required which increase process complexity
Solution Approach 1:
The patent applies preliminary action by incorporating stable silyl hydride functional groups directly into the polymer backbone during the polymerization process itself, rather than attempting to introduce them afterward. This eliminates the need for subsequent protection and deprotection steps, resolving the contradiction between functional group stability and process complexity
Solution Approach 2:
The invention extracts and removes the problematic protection/deprotection steps from the synthesis pathway. By using silyl hydride-functionalized monomers that are inherently stable under anionic polymerization conditions, the method eliminates these additional reaction steps while maintaining functional group integrity
2Adaptability or versatility
If living polymers are terminated with electrophilic reagents, then functional groups can be introduced, but incomplete functionalization and side products are obtained
Solution Approach 1:
The patent incorporates functional groups into the monomer structure before polymerization occurs. This preliminary incorporation ensures that every polymer chain receives the exact same functional group content during polymerization, eliminating incomplete functionalization and side reactions that plague post-polymerization modification methods
Solution Approach 2:
The silyl hydride-functionalized monomer acts as an intermediary that carries the functional group through the polymerization process intact. This intermediary approach allows the functional group to be introduced in a controlled manner during polymerization rather than through problematic post-polymerization reactions
3Adaptability or versatility
If in-chain functionalized polymers are made by reactive extrusion, then functional groups can be incorporated along the polymer chain, but side reactions such as chain-crosslinking and chain scission occur
Solution Approach 1:
The patent changes the fundamental parameter of when functionalization occurs - moving it from post-polymerization reactive extrusion to the polymerization step itself. This parameter change allows functional groups to be incorporated under controlled polymerization conditions rather than harsh extrusion conditions, preventing chain-crosslinking and scission
Solution Approach 2:
By incorporating functional groups during polymerization in an inert atmosphere controlled for anionic polymerization, the method protects the polymer chains from degradation. The controlled environment prevents unwanted side reactions while allowing precise functional group incorporation into the polymer backbone
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 approach enables the production of polymers with improved thermal stability and the ability to incorporate a variety of functional groups, suitable for applications requiring high stability and flexibility, such as biomedical and engineering materials.
Implementation Method 1
hydrogenated aromatic alkenyl and diene copolymers containing comonomers that have silyl hydride units
Implementation Method 2
obtained by means of hydrosilylation reactions
Data Source
AI summary
The present invention relates primarily to polymers comprising at least one alkenyl aromatic monomer, at least one conjugated diene monomer, and at least one monomer containing silyl hydride moieties, characterized in that said polymers are hydrogenated and preferably functionalized by hydrosilylation reactions between the silyl hydride groups on the polymer chain and the multiple bonds of any alkene or alkyne compound. Besides the described products, this invention comprises their synthesis processes and their uses, especially as thermofusible adhesives, in plastics impact modification, and in chain-extension reactions to obtain new materials, among others.