Crosslinker
Term: Crosslinker
Category: Chemistry
Definition: A crosslinker is a small molecule that connects two or more long polymer chains, forming a three-dimensional network. When crosslinkers join the chains, they hold the chains in place and keep them from moving freely. This joining process is called crosslinking. Crosslinking changes the polymer’s properties; for example, it can make the material stronger, tougher, and more resistant to heat and chemicals.
How it Works: Crosslinkers are molecules with parts that can chemically join to specific spots on long molecules called polymer chains. They usually become active when heated, exposed to UV light, or treated with a catalyst. When active, crosslinkers form covalent or ionic bonds that create bridges between polymer chains. This changes a liquid or soft polymer into a solid or gel that is stronger and has a controlled amount of flexibility.
Common Uses:
- Formation of hydrogels for drug delivery and tissue scaffolds
- Fabrication of contact lenses and wound dressings with improved elasticity
- Development of durable biomedical coatings, adhesives, and elastomers
- Crosslinking of biodegradable polymers for controlled degradation in medical applications
