Reversible Adhesive Copolymer for Strong Repeatable Bonding
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Solution Overview
Problem
Current adhesive technologies lack reversible and reusable solutions for assembling and disassembling objects without damage or extensive effort, particularly in structural and semi-structural applications, where thermosets are non-reversible and pressure-sensitive adhesives lack strength and thermal resistance.
Innovation Solution
A reversible adhesive composition based on a copolymer of vinyl spacer and vinyl reversible binder monomers, utilizing non-covalent bonding forces such as hydrogen bonding, permanent dipoles, and van der Waals forces, allowing for instantaneous bonding and debonding under ambient conditions without external stimuli, with tunable adhesive strength and high cycle durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermoset adhesives are used for structural applications, then adhesive strength and thermal resistance are improved, but reversibility and reusability deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of adhesive polymers to include reversible bonding groups (hydrogen bonding, metal coordination, host-guest interactions) that allow the adhesive to transition between bonded and debonded states. This enables thermally resistant structural adhesives to become reversible by changing the bonding mechanism from permanent covalent bonds to dynamic reversible bonds.
Solution Approach 2:
The patent employs composite materials by combining polymer matrices with reversible bonding functionalities (such as metal-coordinating groups, hydrogen bonding moieties, or host-guest complexes) to create adhesives that exhibit both structural strength and reversibility. These composite adhesive systems integrate the mechanical properties of polymers with the reversible binding characteristics of supramolecular interactions.
2Ease of operation
If pressure-sensitive adhesives are used for reversibility, then ease of debonding is improved, but adhesive strength and thermal resistance deteriorate
Solution Approach 1:
The patent applies parameter changes by adjusting the strength and reversibility of bonding interactions in pressure-sensitive adhesives through polymer composition modification, crosslinking density control, and bonding mechanism selection. This enables the adhesive to achieve both easy reversibility and enhanced strength by optimizing the balance between cohesive energy and bond strength.
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 reversible assembly and disassembly of objects with strong and durable bonds, maintaining adhesive strength across multiple cycles, suitable for applications requiring rapid assembly and disassembly in various sectors, reducing waste and improving material reuse.
Implementation Method 1
utilizing non-covalent bonding forces such as hydrogen bonding, permanent dipoles, and van der Waals forces
Implementation Method 2
utilizing non-covalent bonding forces such as hydrogen bonding, permanent dipoles, and van der Waals forces
Implementation Method 3
utilizing non-covalent bonding forces such as hydrogen bonding, permanent dipoles, and van der Waals forces
Data Source
AI summary
The disclosure relates to a reversible adhesive composition including a copolymer between a vinyl spacer monomer unit and a vinyl reversible binder monomer unit. Each monomer unit can be based on acrylate monomer, a vinyl ester monomer, or a vinyl ether monomer, with the spacer monomer unit generally having a shorter pendant chain (such as 1-3 carbon atoms) and the reversible binder monomer unit having a longer pendant chain (such as 3-20 carbon atoms). A corresponding article includes first and second surfaces (or substrates) that are in contact with and bonded to the reversible adhesive composition at an interface therebetween. The reversible adhesive composition generally involves non-covalent and/or non-ionic bonding forces, for example H-bonding, permanent dipole, electron donor-acceptor moieties, and/or van der Waals forces, between the copolymer chains. The first and second surfaces can be repeatedly bonded, separated, and re-bonded while retaining the adhesive strength of the reversible adhesive composition.