Thionolactone-Methacrylate Copolymers for Degradable PMMA Backbones
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Solution Overview
Problem
Existing thionolactone-based cleavable comonomers have not been successful in copolymerizing with methacrylates, leading to difficulties in deconstructing polymethylmethacrylate (PMMA) and polymethacrylic acid (PMAA) polymers, as the fast propagation of methacrylate radicals hinders the insertion of comonomers into the polymer backbone, resulting in block structures rather than random copolymers.
Innovation Solution
Development of thionolactones that can copolymerize with methacrylates to form degradable copolymers, allowing for backbone deconstruction and enabling recycling and biodegradation through radical ring-opening polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thionolactone-based cleavable comonomers are used to enable polymer deconstruction, then backbone degradability is achieved, but copolymerization with methacrylates is hindered due to fast homopropagation kinetics
Solution Approach 1:
The patent modifies the chemical structure of thionolactone comonomers by introducing electron-withdrawing groups (such as fluorine atoms at the 2-position) to alter the reactivity ratios. This parameter change in molecular structure enables the comonomer to compete effectively with fast homopropagation of methacrylates, achieving random copolymerization while maintaining backbone degradability.
2Reliability
If cleavable comonomers are inserted into polymer backbone, then deconstruction capability is enabled, but block structures form instead of random copolymers due to kinetic limitations
Solution Approach 1:
By changing the electronic parameters of the comonomer through substituent introduction, the patent achieves more uniform composition distribution in the copolymer. The modified comonomer exhibits reactivity that allows statistical incorporation throughout the polymer chain, producing random copolymers rather than block structures, while preserving the deconstruction capability.
3Reliability
If thionolactone comonomers copolymerize with methacrylates, then degradable copolymers are formed, but compositional gradients and unwanted crosslinks occur
Solution Approach 1:
The patent optimizes the chemical parameters of the thionolactone comonomer to achieve balanced reactivity with methacrylates. This reduces compositional gradients by ensuring more uniform monomer incorporation throughout polymerization. The structural modifications also minimize side reactions that lead to unwanted crosslinking, while maintaining the essential degradable thioester bonds in the 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
The thionolactones enable the formation of copolymers with less pronounced compositional gradients, fewer unwanted crosslinks, and efficient degradation without compromising material properties, enhancing compatibility with free-radical polymerization methods.
Implementation Method 1
Thionolactones are monomers for radical ring-opening polymerization (rROP), allowing one to install cleavable thioester groups into the backbones of polymers and thereby make them degradable into small fragments
Implementation Method 2
The thionolactones enable the formation of copolymers with less pronounced compositional gradients, fewer unwanted crosslinks, and efficient degradation without compromising material properties, enhancing compatibility with free-radical polymerization methods
Data Source
AI summary
The present disclosure provides thionolactones (e.g., compounds of Formula II, and tautomers and salts thereof). The thionolactones may be useful as comonomers to copolymerize with other comonomers, e.g., methacrylates (e.g., MMA) to generate copolymers, e.g., random copolymers. The copolymers may be degradable (e.g., backbone degradable). The copolymers may be useful for waste management or biodegradability.