Abstract
Norbornene derivatives (NBEs) are common monomers for living ring-opening metathesis polymerization and yield polymers with low dispersities and diverse functionalities. However, the all-carbon backbone of poly-NBEs is non-degradable. Here we report a method to synthesize degradable polymers by copolymerizing 2,3-dihydrofuran with NBEs. 2,3-Dihydrofuran rapidly reacts with Grubbs catalyst to form a thermodynamically stable Ru Fischer carbene—the only detectable active Ru species during copolymerization—and the addition of NBEs becomes rate determining. This reactivity attenuates the NBE homoaddition and allows uniform incorporation of acid-degradable enol ether linkages throughout the copolymers, which enables complete polymer degradation while maintaining the favourable characteristics of living ring-opening metathesis polymerization. Copolymerization of 2,3-dihydrofuran with NBEs gives low dispersity polymers with tunable solubility, glass transition temperature and mechanical properties. These polymers can be fully degraded into small molecule or oligomeric species under mildly acidic conditions. This method can be readily adapted to traditional ring-opening metathesis polymerization of widely used NBEs to synthesize easily degradable polymers with tunable properties for various applications and for environmental sustainability.
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All data supporting the findings of this study are available within the Article and its Supplementary Information. Source data are provided with this paper.
References
Grubbs, R. H. Khosravi, E. Handbook of Metathesis 2nd edn Vol. 3 (Wiley-VCH, 2015).
Kamaly, N., Yameen, B., Wu, J. & Farokhzad, O. Degradable controlled-release polymers and polymeric nanoparticles: mechanisms of controlling drug release. Chem. Rev. 116, 2602–2663 (2016).
Haider, T., Volker, C., Kramm, J., Landfester, K. & Wurm, F. Plastics of the future? The impact of biodegradable polymers on the environment and society. Angew. Chem. Int. Ed. 58, 50–62 (2018).
Ma, S. & Webster, D. Degradable thermosets based on labile bonds or linkages: a review. Prog. Poly. Sci. 76, 65–110 (2018).
Fishman, J. M. & Kiessling, L. L. Synthesis of functionalizable and degradable polymers by ring-opening metathesis polymerization. Angew. Chem. Int. Ed. 52, 5061–5064 (2013).
Gutekunst, W. R. & Hawker, C. J. A general approach to sequence-controlled polymers using macrocyclic ring opening metathesis polymerization. J. Am. Chem. Soc. 137, 8038–8041 (2015).
Nowalk, J. A. et al. Sequence-controlled polymers through entropy-driven ring-opening metathesis polymerization: theory, molecular weight control, and monomer design. J. Am. Chem. Soc. 141, 5741–5752 (2019).
Bhaumik, A., Peterson, G. I., Kang, C. & Choi, T. L. Controlled living cascade polymerization to make fully degradable sugar-based polymers from d-glucose and d-galactose. J. Am. Chem. Soc. 141, 12207–12211 (2019).
Debsharma, T., Behrendt, F., Laschewsky, A. & Schlaad, H. Ring-opening metathesis polymerization of biomass-derived levoglucosenol. Angew. Chem. Int. Ed. 58, 6718–6721 (2019).
Ofsteadm, E. & Calderon, N. Equilibrium ring-opening polymerization of mono- and multicyclic unsaturated monomers. Makromol. Chem. 154, 21–34 (1972).
Liu, H. et al. Dynamic remodeling of covalent networks via ring-opening metathesis polymerization. ACS Macro Lett. 7, 933–937 (2018).
Neary, W. & Kennemur, J. Polypentenamer renaissance: challenges and opportunities. ACS Macro Lett. 8, 46–56 (2019).
Moatsou, D., Nagarkar, A., Kilbinger, A. F. M. & O’Reilly, R. K. Degradable precision polynorbornenes via ring-opening metathesis polymerization. J. Polym. Sci. A 54, 1236–1242 (2016).
Mallick, A. et al. Oxadiazabicyclooctenone as a versatile monomer for the construction of pH sensitive functional polymers via ROMP. Polym. Chem. 9, 372–377 (2018).
Shieh, P., Nguyen, H. V. T. & Johnson, J. A. Tailored silyl ether monomers enable backbone-degradable polynorbornene-based linear, bottlebrush and star copolymers through ROMP. Nat. Chem. 11, 1124–1132 (2019).
Shieh, P. et al. Cleavable comonomers enable degradable, recyclable thermoset plastics. Nature 583, 542–547 (2020).
Liang, Y., Sun, H., Cao, W., Thompson, M. P. & Gianneschi, N. C. Degradable polyphosphoramidate via ring-opening metathesis polymerization. ACS Macro Lett. 9, 1417–1422 (2020).
Elling, B. R., Su, J. K. & Xia, Y. Degradable polyacetals/ketals from alternating ring-opening metathesis polymerization. ACS Macro Lett. 21, 180–184 (2020).
Boadi, F. O., Zhang, J., Yu, X., Bhatia, S. R. & Sampson, N. S. Alternating ring-opening metathesis polymerization provides easy access to functional and fully degradable polymers. Macromolecules 53, 5857–5868 (2020).
Sun, H., Liang, Y., Thompson, M. & Gianneschi, N. Degradable polymers via olefin metathesis polymerization. Prog. Poly. Sci. 120, 101427 (2021).
Feist, J. D. & Xia, Y. Enol ethers are effective monomers for ring-opening metathesis polymerization: synthesis of degradable and depolymerizable poly(2,3-dihydrofuran). J. Am. Chem. Soc. 142, 1186–1189 (2020).
Sui, X., Zhang, T., Pabarue, A., Fu, L. & Gutekunst, W. Alternating cascade metathesis polymerization of enynes and cyclic enol ethers with active ruthenium Fischer carbenes. J. Am. Chem. Soc. 142, 12942–12947 (2020).
Sanford, M. S., Love, J. A. & Grubbs, R. H. Mechanism and activity of ruthenium olefin metathesis catalysts. J. Am. Chem. Soc. 123, 6543–6554 (2001).
Louie, J. & Grubbs, R. H. Metathesis of electron-rich olefins: structure and reactivity of electron-rich carbene complexes. Organometallics 21, 2153–2164 (2002).
Yasir, M. et al. One-step ring opening metathesis block-like copolymers and their compositional analysis by a novel retardation technique. Angew. Chem. Int. Ed. 59, 13597–13601 (2020).
Katayama, H. et al. Highly selective ring-opening/cross-metathesis reactions of norbornene derivatives using selenocarbene complexes as catalysts. Angew. Chem. Int. Ed. 39, 4513–4515 (2000).
Liu, Z. & Rainier, J. D. Regioselective ring-opening/cross-metathesis reactions of norbornene derivatives with electron-rich olefins. Org. Lett. 7, 131–133 (2005).
Kang, E.-H., Yu, S., Lee, I., Park, S. & Choi, T.-L. Strategies to enhance cyclopolymerization using third-generation Grubbs catalyst. J. Am. Chem. Soc. 136, 10508–10514 (2014).
Elling, B., Su, J., Feist, J. & Xia, Y. Precise placement of single monomer units in living ring-opening metathesis polymerization. Chem 5, 2691–2701 (2019).
Meyer, V. & Lowry, G. Integral and differential binary copolymerization equations. J. Polym. Sci. A 3, 2843–2851 (1965).
Lynd, N., Ferrier, R. Jr. & Beckingham, B. Recommendation for accurate experimental determination of reactivity ratios in chain copolymerization. Macromolecules 52, 2277–2285 (2019).
Chatterjee, A. K., Morgan, J. P., Scholl, M. & Grubbs, R. H. Synthesis of functionalized olefins by cross and ring-closing metatheses. J. Am. Chem. Soc. 122, 3783–3784 (2000).
Lee, C. W., Choi, T.-L. & Grubbs, R. H. Ring expansion via olefin metathesis. J. Am. Chem. Soc. 124, 3224–3225 (2002).
Choi, T.-L., Rutenberg, I. M. & Grubbs, R. H. Synthesis of A,B-alternating copolymers by ring-opening-insertion-metathesis polymerization. Angew. Chem. Int. Ed. 41, 3839–3841 (2002).
Chatterjee, A. K., Choi, T.-L., Sanders, D. P. & Grubbs, R. H. A general model for selectivity in olefin cross metathesis. J. Am. Chem. Soc. 125, 11360–11370 (2003).
Acknowledgements
We thank the National Science Foundation for financial support (CHE-2106511). Y.X. thanks the Alfred Sloan Foundation for the Sloan fellowship.
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J.D.F. and Y.X. conceived this project. J.D.F. performed the majority of the experiments and D.C.L. synthesized and characterized the water-soluble copolymers. J.D.F. and Y.X. wrote the manuscript with input from D.C.L.
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J.D.F. and Y.X. are named inventors on a patent application (US Provisional Application 63/169,588) filed by Stanford University on the copolymerization method described in this work.
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Supplementary Information
Supplementary Figs. 1–33, Discussion and Tables 1 and 2.
Supplementary Video 1
Video showing degradation of crosslinked polymer P7bx upon addition of 1 drop of 1M HCl.
Source data
Source Data Fig. 2
Numerical data or dRI from GPC traces shown in Fig. 2.
Source Data Fig. 4
Numerical stress–strain data presented in Fig. 4.
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Feist, J.D., Lee, D.C. & Xia, Y. A versatile approach for the synthesis of degradable polymers via controlled ring-opening metathesis copolymerization. Nat. Chem. 14, 53–58 (2022). https://doi.org/10.1038/s41557-021-00810-2
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DOI: https://doi.org/10.1038/s41557-021-00810-2
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