Biodegradable Rubber Elastomer Using Enzymatic Lignin and Itaconic Acid
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Solution Overview
Problem
Current biodegradable rubber elastomers face challenges such as the use of toxic solvents in synthesis, complex preparation processes, single material performance, and limited mechanical properties, which hinder their widespread adoption due to environmental and recyclability issues.
Innovation Solution
A biodegradable self-healing rubber elastomer is developed using enzymatic lignin and itaconic acid with lipoic acid, forming hydrogen bonds and coordination cross-links to enhance tensile strength and elasticity, and incorporating metal ions to improve network structure, all while avoiding toxic solvents and simplifying the synthesis process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If reversible non-covalent bonds are introduced to achieve self-healing properties, then the material can repair mechanical damage, but the mechanical properties become weak
Solution Approach 1:
The patent combines reversible non-covalent bonds (hydrogen bonds, metal coordination bonds) with dynamic covalent bonds (disulfide bonds) to create a composite bonding system. This allows the material to exhibit both self-healing capability through reversible bonds and enhanced mechanical strength through the synergistic effect of multiple bond types working together
Solution Approach 2:
The patent adjusts the ratio and type of bonds in the polymer network to optimize the balance between self-healing and mechanical strength. By controlling the concentration of different bond types and their spatial distribution, the material achieves optimal performance in both repair capability and structural integrity
2Ease of manufacture
If toxic solvents are used in the synthesis of self-healing materials, then the synthesis process can proceed, but the environment is highly polluted
Solution Approach 1:
The patent converts the previously harmful toxic solvents into beneficial non-toxic alternatives by using water or green solvents in the synthesis process. This transformation maintains the feasibility of the synthesis process while eliminating environmental pollution, turning a harmful factor into a beneficial one
Solution Approach 2:
The patent replaces traditional chemical synthesis methods that require toxic solvents with greener chemical processes that use water or environmentally friendly solvents. This substitution maintains the necessary chemical reactions while eliminating harmful environmental factors
3Ease of repair
If lipoic acid is used to prepare supramolecular polymers, then excellent self-healing properties are achieved, but the tensile strength is low due to reverse closed-loop depolymerization
Solution Approach 1:
The patent introduces enzymatic lignin and itaconic acid as intermediary substances that mediate between lipoic acid chains. These intermediaries form cross-linking structures that prevent reverse closed-loop depolymerization while maintaining the self-healing properties of the lipoic acid-based polymer network
Solution Approach 2:
The patent creates a composite polymer system combining lipoic acid with enzymatic lignin and itaconic acid. This composite structure leverages the self-healing properties of lipoic acid while the lignin and itaconic acid components provide structural strength and prevent depolymerization through their rigid aromatic structures and cross-linking capabilities
4Strength
If enzymatic lignin is added to enhance tensile strength, then the material strength improves, but the synthesis process becomes more complex
Solution Approach 1:
The patent performs preliminary pre-treatment of enzymatic lignin to activate its reactive groups before incorporation into the polymer matrix. This preliminary action ensures efficient integration and strong bonding without requiring complex multi-step synthesis procedures, thereby improving tensile strength while keeping the overall process simple
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 resulting material exhibits high tensile strength, elongation at break, and self-healing properties, comparable to traditional synthetic rubbers, with reduced environmental impact and potential for recyclability, addressing the limitations of existing biodegradable elastomers.
Implementation Method 1
the carboxyl group of lipoic acid provides binding sites for a variety of polar functional groups of enzymatic lignin, and greatly improves the tensile strength of the material through hydrogen bonding
Implementation Method 2
the double bond contained in itaconic acid can prevent the depolymerization of polysulfide by inverse vulcanization of the terminal radicals of polysulfide
Implementation Method 3
incorporating metal ions to improve network structure
Data Source
AI summary
Provided are a biodegradable self-healing rubber elastomer and its preparation method, which belongs to the field of elastomeric materials. The biodegradable self-repairing rubber elastomer is prepared by a melting method in which enzymatic lignin and itaconic acid are added to lipoic acid separately, melted and blended separately, and then cooled to obtain the rubber elastomer.