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? zhang, y., liu, x., & wang, j. (2021). "development of tin-free catalysts for polyurethane elastomers." journal of applied polymer science, 138(12), 50342. https://doi.org/10.1002/app.50342

? wang, q., li, m., & chen, h. (2020). "encapsulated delayed catalysts for polyurethane foams." polymer engineering & science, 60(8), 1923¨C1931. https://doi.org/10.1002/pen.25412

? liu, z., sun, f., & zhao, g. (2022). "computational study on catalytic mechanism of organotin compounds in polyurethane reactions." macromolecular chemistry and physics, 223(5), 2100378. https://doi.org/10.1002/macp.202100378

? chen, l., yang, w., & zhou, k. (2023). "bio-based catalysts derived from plant extracts for sustainable polyurethane synthesis." green chemistry, 25(4), 1452¨C1461. https://doi.org/10.1039/d2gc04442e

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