Adhesion Evolution: Designing Smart Polymeric Adhesive Systems with On-Demand Reversible Switchability.
Yee Lin Tan1, Yi Jing Wong1,2, Nicholas Wei Xun Ong1,2
1Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Republic of Singapore.
ACS Nano
|August 26, 2024
Summary
Smart polymeric switchable adhesives can be turned on and off with external triggers like heat or light. This review focuses on stimuli selection and switching mechanisms for advanced adhesive applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Adhesion Science
Background:
- Smart polymeric switchable adhesives offer controllable adhesion.
- These materials transition between
- On
- and
- Off
- states via external stimuli.
- Stimuli selection is crucial for designing effective switchable adhesives.
Purpose of the Study:
- To review recent advancements in smart switchable polymeric adhesives.
- To focus on the selection of stimuli triggers for adhesion switching.
- To categorize switching mechanisms and evaluate performance metrics.
Main Methods:
- Literature review of smart switchable polymeric adhesives over the past decade.
- Categorization of systems based on four adhesion switching mechanisms: interfacial adhesion, stiffness, contact area, and suction-based switching.
- Evaluation of performance based on maximum adhesion strength, switch ratio, and switch time.
Main Results:
- Identified key stimuli triggers (temperature, light, electricity, magnetism, chemical agents) for adhesion control.
- Classified switching mechanisms influencing adhesive performance.
- Highlighted distinct advantages and limitations of different stimuli and mechanisms.
Conclusions:
- Smart switchable adhesives are a rapidly advancing field with diverse applications.
- Stimuli-responsive design is critical for optimizing performance.
- Further research is needed to address challenges and explore future directions in this emerging area.
Related Concept Videos
00:53Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
1.9K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
1.9K
01:20Anionic Chain-Growth Polymerization: Overview
2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K
01:26Polymer Classification: Stereospecificity
2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
01:14Polymer Classification: Architecture
2.7K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
2.7K
01:03Step-Growth Polymerization: Overview
3.4K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
3.4K
01:24Characteristics and Nomenclature of Copolymers
2.5K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
2.5K