The DOI matches its Crossref record; 14 of the 14 references it cites were found in a registry or an index.
Poly(lactic acid) Degradation into Methyl Lactate Catalyzed by a Well-Defined Zn(II) Complex
Open accessAbstract
Abstract Poly(lactic acid) (PLA) was degraded to methyl lactate (Me-La) by an imino monophenolate Zn(1)2 catalyst in the presence of tetrahydrofuran, as the solvent, and methanol, as the protic source. As well as solution-based polymerization and degradation, catalyst stability was assessed and discussed. The chemical degradation of four different commercial samples of PLA, varying in molecular weight, was studied. The effect of PLA concentration (0.05–0.2 g mL–1), reaction temperature (40–130 °C), and catalyst concentration (4–16 wt %) on conversion, yield, and selectivity were studied and results statistically analyzed. Mass-transfer limitations were assessed by utilizing two different PLA particle sizes and altering the stirring speed. Results revealed that the main variables affecting PLA degradation are temperature and catalyst concentration. It was possible to observe Me-La formation even at 40 °C, although the reaction times were significantly longer when compared to the highest temperatures. Conversions of 100%, as determined by 1H NMR spectroscopy and gel permeation chromatography, were possible in short times (<15 min) depending on temperature and catalyst concentration. A reaction mechanism for the production of Me-La from PLA, which considers the formation of chain-end groups as intermediates is presented and values for the kinetic constants are determined from the model. The activation energy for the initial degradation step was in the range 39–65 kJ mol–1, decreasing with increasing catalyst loading.
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Cites
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Polymerization of Lactide with Zinc and Magnesium β-Diiminate Complexes: Stereocontrol and Mechanism
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Catalysis as an Enabling Science for Sustainable Polymers
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Chemically recyclable polymers: a circular economy approach to sustainability
Hong, M., & Chen, E. Y.-X. (2017) · Green Chemistry · doi:10.1039/c7gc01496a · Cited by 876
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Shape-selective zeolite catalysis for bioplastics production
Dusselier, M., Van Wouwe, P., Dewaele, A., Jacobs, P. A., & Sels, B. F. (2015) · Science · doi:10.1126/science.aaa7169 · Cited by 376
Acid- and base-catalyzed hydrolyses of aliphatic polycarbonates and polyesters
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Kinetics of the hydrolytic degradation of poly(lactic acid)
Codari, F., Lazzari, S., Soos, M., Storti, G., Morbidelli, M., & Moscatelli, D. (2012) · Polymer Degradation and Stability · doi:10.1016/j.polymdegradstab.2012.06.026 · Cited by 184
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Transforming polylactide into value‐added materials
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Self-citationA circular economy approach to plastic waste
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Self-citationRecycling of Bioplastics: Routes and Benefits
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McKeown, P., & Jones, M. D. (2020) · Sustainable Chemistry · doi:10.3390/suschem1010001 · Cited by 294
Self-citationChen, J., Liu, Z., Qiu, S., Li, Y., Sun, J., Li, H., Gu, X., & Zhang, S. (2023) · Chemical Engineering Journal · doi:10.1016/j.cej.2023.145000 · Cited by 69
Tuning the Thiolen: Al(III) and Fe(III) Thiolen Complexes for the Isoselective ROP of rac-Lactide
Stewart, J. A., McKeown, P., Driscoll, O. J., Mahon, M. F., Ward, B. D., & Jones, M. D. (2019) · Macromolecules · doi:10.1021/acs.macromol.9b01205 · Cited by 40
Self-citationHu, Y., Xia, D., Shen, H., Nan, J., Ma, N., Guo, Z., Wang, X., & Jin, Q. (2023) · Ceramics International · doi:10.1016/j.ceramint.2022.12.014 · Cited by 23
Metadata
- Authors
- Román-Ramírez, L. A., Mckeown, P., Jones, M. D., & Wood, J.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-12-06
- Volume
- 9
- Issue
- 1
- Pages
- 409-416
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W2903682689
- Cited by
- 164
- References
- 14
- FWCI
- 3.19
- Type
- journal article
- Language
- en
- Open access
- hybrid
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