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[1] liu, j., zhang, y., & wang, h. (2020). non-volatile catalysts for polyurethane foams: a review. journal of applied polymer science, 137(15), 48656.
[2] m¨¹ller, k., & sch?fer, t. (2018). development and application of amine-free catalyst systems in polyurethane technology. progress in organic coatings, 119, 1¨C10.
[3] chen, x., li, m., & zhao, q. (2021). synthesis and performance evaluation of dbu-based salt catalysts for rigid polyurethane foams. polymer testing, 94, 107023.
[4] oertel, g. (ed.). (2014). polyurethane handbook (2nd ed.). hanser gardner publications.
[5] tang, y., & sun, l. (2022). green catalysts for polyurethane production: from design to application. green chemistry, 24(3), 1234¨C1248.
[6] zhang, w., & zhou, f. (2019). environmental impact assessment of amine-free catalysts in polyurethane foam production. environmental science & technology, 53(12), 6987¨C6995.
[7] us patent no. us9873755b2. (2018). catalyst composition comprising a guanidine or amidine compound for polyurethane formation.
[8] european chemicals agency (echa). (2021). restrictions on volatile amine catalysts under reach regulation.
[9] hu, c., & lin, z. (2020). recent advances in non-amine catalysts for polyurethane synthesis. chinese journal of polymer science, 38(6), 567¨C578.
[10] park, s. j., & kim, h. r. (2017). effect of catalyst types on the physical properties of flexible polyurethane foams. journal of industrial and engineering chemistry, 50, 214¨C221.
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