Enhanced durability of polyurethane nanocomposite coatings
Obtaining the highest possible level of weathering resistance to protect the polymeric composites against sunlight and free radicals is the primary function of every exterior composite, such as polyurethane (PU).
Enhancing long-term weathering stability
In a new paper, a typical PU matrix was modified by two differently reduced graphene oxide nanosheets to enhance long-term weathering stability. The synthesised graphene oxide nanosheets were reduced by Nettle leaves extract as a green reductant and hydrazine as a typical reducing agent. The graphene oxide and two reduced species were embedded in PU to investigate their impact on weathering stability.
Several techniques were employed to assess the weathering performance during 1400 h exposure to artificially accelerated conditions. Achieving superior weathering performance approved the effective role of reduced graphene oxide (especially green reduced) in elevating weathering stability of PU nanocomposites.
The study has been published in Progress in Organic Coatings, Volume 154, May 2021.