The Problem:
PVC is the third most produced plastic globally and is used in many applications, such as clean water, due to its versatility. Nevertheless, the chlorine atoms within PVC, and the presence of additives can make it very difficult to recycle. Current thermomechanical methods of recycling PVC often result in quality degradation that limits its reuse. Furthermore, conventional recycling methods applied to PVC can result in hazardous by-products. The limitations of these methods along with the abundance of PVC highlight the need for a scalable and environmentally friendly method of repurposing PVC for use in value-added applications.
The Solution:
Researchers at The University of Alabama have developed new methods of upcycling PVC that allows it to be converted into a elastomer. The two-stage process first involves dehydrochlorination and hydrogenation of PVC feedstock to introduce polyethylene segments and lower the glass transition temperature of the material. This process can be repeated over multiple cycles to achieve precise control over properties. These new polymers can also be crosslinked to rubbers, reconfigured to thermoplastic elastomers, or depolymerized to valuable small molecules.
Benefits: