Precise Carboxylic Acid-Functionalized Polyesters in Reprocessable Vitrimers
Precise Carboxylic Acid-Functionalized Polyesters in Reprocessable Vitrimers
Authors (5): M. Concilio, G. S. Sulley, F. Vidal, S. Brown, C. K. Williams
Themes: Circular Economy
DOI: 10.1021/jacs.4c14032
Citations: 6
Pub type: journal-article
Pub year: 2025

Publisher: American Chemical Society (ACS)

Issue: 8

License: [{"start"=>{"date-parts"=>[[2025, 2, 14]], "date-time"=>"2025-02-14T00:00:00Z", "timestamp"=>1739491200000}, "content-version"=>"vor", "delay-in-days"=>0, "URL"=>"https://creativecommons.org/licenses/by/4.0/"}]

Publication date(s): 2025/02/26 (print) 2025/02/14 (online)

Pages: 6492-6502

Volume: 147 Issue: {"issue"=>"8", "published-print"=>{"date-parts"=>[[2025, 2, 26]]}}

Journal: Journal of the American Chemical Society

Link: [{"URL"=>"https://pubs.acs.org/doi/pdf/10.1021/jacs.4c14032", "content-type"=>"application/pdf", "content-version"=>"vor", "intended-application"=>"unspecified"}, {"URL"=>"https://pubs.acs.org/doi/pdf/10.1021/jacs.4c14032", "content-type"=>"unspecified", "content-version"=>"vor", "intended-application"=>"similarity-checking"}]

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Thermosets are valued for their exceptional dimensional stability, mechanical properties, and resistance to creep and chemicals. Their permanent molecular structures limit reshaping, reprocessing, and recycling. Incorporating exchangeable chemical bonds into cross-linked polymer networks provides materials with thermoset-like properties that are also reprocessable. Here, ring-opening copolymerization (ROCOP) of unpurified, commercially available epoxides and succinic anhydride is employed to synthesize well-defined, low molecular weight polyesters with controlled functionalization. Polymer networks are then formed through the catalyzed reaction of these copolymers with the epoxy-containing cross-linker diglycidyl ether of bisphenol A. Catalyst mixtures of zinc bis(2-ethylhexanoate) and 1,8-diazabicyclo(5.4.0)undec-7-ene are used to assess the role of the catalysts in the curing and dynamic bond exchange reactions. Varying the catalyst ratios results in polymer networks with tunable mechanical properties (90% < εb < 450%, 0.30 MPa < UTS < 24 MPa), high creep recovery (%recovery > 90% after five creep cycles), and good reprocessability.

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