| Title |
Next Generation of Zinc Bisguanidine Polymerization Catalysts towards Highly Crystalline, Biodegradable Polyesters |
| ID_Doc |
19550 |
| Authors |
Hermann, A; Hill, S; Metz, A; Heck, J; Hoffmann, A; Hartmann, L; Herres-Pawlis, S |
| Title |
Next Generation of Zinc Bisguanidine Polymerization Catalysts towards Highly Crystalline, Biodegradable Polyesters |
| Year |
2020 |
| Published |
Angewandte Chemie-International Edition, 59.0, 48 |
| Abstract |
Polylactide and polycaprolactone are both biodegradable polymers produced through metal-catalyzed ring-opening polymerization. For a truly sustainable lifecycle of these polymers it is essential to replace the industrially used cytotoxic catalyst tin(II) bis(2-ethylhexanoate) [Sn(Oct)(2)] with non-toxic alternatives. Here, we report the fastest known robust catalyst in the polymerization of lactide and epsilon-caprolactone. This zinc guanidine catalyst can polymerize non-purified technicalrac-lactide and epsilon-caprolactone in the melt at different [M]/[I] ratios with fast rate constants, high molar masses, and high yields in a short time, leading to colorless, transparent polymer. Moreover, we report that polylactide and polycaprolactone produced by zinc-guanidine complexes have favorably high crystallinities. In fact, the obtained polylactide shows a more robust degradation profile than its Sn(Oct)(2)-catalysed equivalent due to a higher degree of crystallinity. |
| PDF |
https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/anie.202008473
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