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- zhang, y., et al. (2020). "development and application of non-tin catalysts in polyurethane foaming." journal of applied polymer science, 137(18), 48765.
- european chemicals agency (echa). (2021). restriction of certain hazardous substances in polyurethane production.
- us environmental protection agency (epa). (2019). chemical action plan for organotin compounds.
- wang, l., & liu, h. (2022). "progress in environmentally friendly metal catalysts for polyurethane synthesis." polymer materials science & engineering, 38(3), 45¨C51.
- ministry of ecology and environment of china. (2023). green development guidelines for the polyurethane industry.
- kim, j., et al. (2021). "bi-based catalysts for rigid polyurethane foams: performance and environmental impact assessment." green chemistry, 23(7), 2543¨C2551.
- chen, x., & zhao, m. (2021). "cost-benefit analysis of eco-friendly catalysts in polyurethane manufacturing." china plastics industry, 49(10), 12¨C18.
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