De-crosslinking

De-crosslinking is a chemical process that breaks the covalent bonds, known as crosslinks, between polymer chains in a crosslinked polymer network. Crosslinking introduces rigidity and strength to a material. Therefore, De-crosslinking results in the degradation or softening of the polymer, altering its physical properties and rendering it more flexible or soluble. This process often involves the introduction of chemical reagents, heat, or radiation to disrupt the crosslinks, effectively returning the polymer closer to its original, uncrosslinked state. The extent of De-crosslinking can vary significantly, depending on the specific polymer, the nature of the crosslinks, and the chosen De-crosslinking method.

De-crosslinking meaning with examples

• The researchers used a specific solvent at elevated temperature for De-crosslinking the rubber, which facilitated its recycling by breaking the chemical bonds and increasing the polymer chain mobility. This made the reclaimation process more efficient, reducing waste and improving resource utilization. The resultant polymer was then repurposed for other products.
• During the study, the scientists observed that exposing the crosslinked hydrogel to UV radiation induced significant de-crosslinking. This resulted in a reduction of its mechanical strength. The modified hydrogel was then used in drug delivery systems to allow for sustained release of the drug component over time.
• To analyze the nature of the crosslinks, the analysts performed selective De-crosslinking on the polymer. This provided critical insights into the chemical structure of the polymer network. This also allowed for the isolation of the polymer chains for further characterization and testing of other properties of the original polymer.
• The engineers optimized the formulation of the tire rubber, and, by De-crosslinking the end-of-life tires, facilitated their conversion into oil. The oil generated can be used for different types of production. This is a key aspect of achieving a circular economy for the material and reducing the environmental impact of end-of-life tires.