The melt-reprocessing of thermosets such as polyurethanes (PUs) and epoxy network materials has been a constant technical challenge. Here we report, for the first time, melt-reprocessing of mixed PUs made of aliphatic and aromatic feedstocks. Our methodology consists of using Zn (II) catalysts combined with a slight excess of diols. The use of diols was sufficient to partially reverse the gel-point and reclaim the melt-processability as demonstrated for aliphatic, aromatic, and mixed PUs. Zinc acetate was not effective in imparting melt-processability to PU samples. Furthermore, the mixed PU samples were successfully melt-processed in an extruder on a large scale. This work holds the promise to facilitate the recycling of post-consumer mixed PUs with immense benefits for science, the economy, and the environment.

Sample approach for the reprocessing of cross-linked and mixed polyurethanes

Where thousands of chemistry professionals meet to share ideas and advance scientific and technical knowledge. Spring 2023 abstracts, posters, and presentations will launch at the end of March.

ACS Spring 2023

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.