Giving superabsorbent polymers a second life as pressure-sensitive adhesives

P. Takunda Chazovachii, Madeline J. Somers, Michael T. Robo, Dimitris I. Collias, Martin I. James, E. Neil G. Marsh, Paul M. Zimmerman, Jose F. Alfaro and Anne J. McNeil ()
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P. Takunda Chazovachii: University of Michigan
Madeline J. Somers: University of Michigan
Michael T. Robo: University of Michigan
Dimitris I. Collias: The Procter & Gamble Co.
Martin I. James: The Procter & Gamble Co.
E. Neil G. Marsh: University of Michigan
Paul M. Zimmerman: University of Michigan
Jose F. Alfaro: University of Michigan
Anne J. McNeil: University of Michigan

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract An estimated 6.3 billion metric tons of post-consumer polymer waste has been produced, with the majority (79%) in landfills or the environment. Recycling methods that utilize these waste polymers could attenuate their environmental impact. For many polymers, recycling via mechanical processes is not feasible and these materials are destined for landfills or incineration. One salient example is the superabsorbent material used in diapers and feminine hygiene products, which contain crosslinked sodium polyacrylates. Here we report an open-loop recycling method for these materials that involves (i) decrosslinking via hydrolysis, (ii) an optional chain-shortening via sonication, and (iii) functionalizing via Fischer esterification. The resulting materials exhibit low-to-medium storage and loss moduli, and as such, are applicable as general-purpose adhesives. A life cycle assessment demonstrates that the adhesives synthesized via this approach outcompete the same materials derived from petroleum feedstocks on nearly every metric, including carbon dioxide emissions and cumulative energy demand.

Date: 2021
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DOI: 10.1038/s41467-021-24488-9

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