Graft Copolymer Architecture Control via ROMP
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Solution Overview
Problem
Current synthetic strategies for graft copolymers face challenges in achieving precise control over grafting density and distribution, leading to difficulties in producing well-defined architectural variants with variable chemical compositions.
Innovation Solution
The development of methods for synthesizing graft copolymers with preselected graft density, distribution, and degree of polymerization, involving copolymerization of macromonomers and reactive diluents, allowing for the formation of highly tunable graft block copolymers with specific properties, and the use of ring-opening metathesis polymerization for grafting through processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If grafting-to or grafting-from approaches are used to synthesize graft copolymers, then graft copolymer architectures can be formed, but precise control over grafting density and distribution is lost due to steric congestion along the backbone
Solution Approach 1:
The patent inverts the traditional grafting approach by using ring-opening metathesis copolymerization where macromonomers containing backbone precursors and side chains copolymerize with reactive diluents. This allows precise control over grafting density and distribution by adjusting monomer ratios, avoiding the steric congestion problems of conventional grafting-to or grafting-from methods.
Solution Approach 2:
The patent employs ring-opening metathesis copolymerization with adjustable monomer composition ratios to precisely control grafting density and distribution. By changing the parameters of monomer feed composition and reaction conditions, well-defined architectural variants with specific grafting characteristics can be achieved without steric congestion limitations.
2Manufacturing precision
If multiple steps are used to attach side chains to pre-formed backbones, then graft copolymer structures can be created, but synthesis time and process complexity increase
Solution Approach 1:
The patent combines backbone formation and side chain attachment into a single copolymerization step. Macromonomers containing both backbone precursor units and side chain groups undergo ring-opening metathesis copolymerization with reactive diluents in one reaction, simultaneously creating the graft copolymer architecture without requiring multiple sequential steps.
Solution Approach 2:
The patent incorporates side chain groups into the macromonomer structure before polymerization. This preliminary incorporation of side chains into the monomer design allows them to be automatically positioned along the backbone during copolymerization, eliminating the need for subsequent side chain attachment steps and reducing overall synthesis time.
3Manufacturing precision
If conventional polymerization methods are used, then polymers can be synthesized, but precise control over molecular weight and architecture is difficult to achieve
Solution Approach 1:
The patent employs ring-opening metathesis copolymerization with reactive diluents that act as chain transfer agents, providing feedback control over molecular weight. The diluent concentration and reactivity ratios can be adjusted to precisely control the degree of polymerization and molecular weight distribution, achieving narrow polydispersity and well-defined architectures.
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
Enables the production of graft copolymers with precise control over molecular structure, leading to versatile and deterministic materials with applications in photonic materials and infrared light-reflecting coatings, among others, without requiring high-energy or time-intensive processes.
Implementation Method 1
ring-opening metathesis polymerization for grafting through processes
Data Source
AI summary
In an aspect, a method of synthesizing a graft copolymer comprises the steps of: copolymerizing a first macromonomer and a first reactive diluent; wherein said first macromonomer comprises a first backbone precursor directly or indirectly covalently linked to a first polymer side chain group; wherein said reactive diluent is provided in the presence of the first macromonomer at an amount selected so as to result in formation said graft copolymer having a first backbone incorporating said diluent and said first macromonomer in a first polymer block characterized by a preselected first graft density or a preselected first graft distribution of said first macromonomer. In some embodiments of this aspect, said preselected first graft density is any value selected from the range of 0.05 to 0.75. In some methods, the composition and amount of said diluent is selected to provide both a first preselected first graft density and a first preselected first graft distribution.