Self-healing siloxane elastomers with ambient temperature Diels-Alder crosslinks
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Solution Overview
Problem
Current self-healing polymers require significant time or external thermal stimuli to heal, limiting their practical application in extending the lifetime and recyclability of synthetic materials.
Innovation Solution
Development of siloxane elastomers with Diels-Alder moieties and maleimide crosslinkers that form reversible crosslinks at ambient temperature, enabling self-healing without external stimuli and facilitating recycling through a retro-Diels-Alder reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional self-healing polymers are used, then damage repair is achieved, but significant time or external thermal stimuli are required
Solution Approach 1:
The patent changes the chemical parameters of the crosslinking system by using Diels-Alder moieties with maleimide crosslinkers that have reversible crosslinking capabilities. This chemical parameter change enables the material to heal at ambient temperature without external thermal stimuli, resolving the contradiction between healing capability and healing time/energy input
Solution Approach 2:
The elastomer system is designed to automatically heal damaged areas through intrinsic reversible crosslinking mechanisms without requiring external intervention. The material self-repairs by utilizing the reversible nature of Diels-Alder crosslinks, which spontaneously reform broken bonds at ambient conditions, eliminating the need for external thermal energy input
2Reliability
If traditional self-healing polymers are used, then damage repair is achieved, but external thermal stimuli are required
Solution Approach 1:
The patent modifies the chemical composition and crosslinking parameters of the polymer system by incorporating Diels-Alder functional groups that exhibit reversible bonding at ambient temperatures. This parameter change eliminates the need for external thermal energy input, as the reversible crosslinking occurs spontaneously under normal conditions
Solution Approach 2:
The elastomer system performs self-healing autonomously without requiring external energy input by utilizing the inherent reversibility of Diels-Alder crosslinks. The system self-repairs damaged areas through spontaneous bond reformation at ambient temperature, making the healing process energy-autonomous
3Ease of repair
If reversible crosslinks are used for self-healing, then recyclability is improved, but crosslinking strength may be reduced
Solution Approach 1:
The patent introduces dynamic reversibility to the crosslinking system through Diels-Alder chemistry, allowing the crosslinks to dynamically break and reform. This dynamic characteristic enables both strong initial bonding for structural integrity and spontaneous reversibility for self-healing and recyclability, resolving the contradiction between strength and recyclability
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 siloxane elastomers demonstrate efficient self-healing at ambient temperature and can be recycled, prolonging their useful life and reducing environmental impact by minimizing waste.
Implementation Method 1
the first Diels-Alder moiety and the maleimide moieties form reversible crosslinks to form the siloxane elastomer
Implementation Method 2
facilitating recycling through a retro-Diels-Alder reaction
Data Source
AI summary
The present disclosure relates to self-healing siloxane elastomers. In particular, the present disclosure relates to self-healing siloxane elastomers comprising at least one siloxane polymer reversibly crosslinked to a second siloxane oligomer or polymer, the reversible cross-linked may be formed at ambient temperature.