Author, as appears in the article.: Guerrero, Federico; Gamardella, Francesco; Ramis, Xavier; De la Flor, Silvia; Serra, Angels
Department: Enginyeria Mecànica Química Analítica i Química Orgànica
URV's Author/s: De la Flor Lopez, Silvia / Gamardella, Francesco / Guerrero Ruiz, Federico / Serra Albet, Maria Angels
Keywords: Ring-opening polymerization Reshapability Recyclability Poly(thiourethanes) Lanthanide triflates Covalent adaptable networks thermosets resins reshapability recyclability lanthanide triflates lactones isocyanate facile dgeba curing initiators covalent adaptable networks cationic copolymerization catalysts
Abstract: Covalent adaptable networks (CANs) are new polymeric materials with the mechanical properties of thermosets and the possibility of being recycled like thermoplastics. Poly(thiourethane) networks have demonstrated vitrimeric-like behavior at high temperatures due to the trans-thiocarbamoylation process, which Lewis acids and bases can accelerate. In this study, we report the use of lanthanide triflates (La, Sm, Dy, Er, and Yb) as Lewis acid catalysts, a greener alternative to other metallic catalysts as dibutyltin dilaurate (DBTDL) widely used in poly(urethane) and poly(thiourethane) networks. Moreover, they are not as reactive as DBTDL, and the curing mixture can be manipulated for a longer time at room temperature. As monomers, trimethylolpropane tris(3-mercapto propionate) (S3), hexamethylene diisocyanate (HDI), and isophorone diisocyanate (IPDI) have been used. We have demonstrated that the materials prepared with lanthanum triflate present the lowest relaxation times than those prepared with other lanthanide triflates or DBTDL. Calorimetry (DSC) and infrared spectroscopy (FTIR) were applied to study the curing process. The materials obtained were fully characterized by thermogravimetric analysis (TGA) and thermomechanical tests (DMA).
Thematic Areas: Química Polymers and plastics Polymer science Organic chemistry Medicina ii Materials chemistry Materiais Interdisciplinar Farmacia Engenharias iv Engenharias iii Engenharias ii Ciências biológicas ii Ciências biológicas i Ciências agrárias i Biotecnología Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: angels.serra@urv.cat federico.guerrero@estudiants.urv.cat federico.guerrero@estudiants.urv.cat silvia.delaflor@urv.cat
Author identifier: 0000-0003-1387-0358 0000-0001-7163-4068 0000-0001-7163-4068 0000-0002-6851-1371
Record's date: 2024-11-02
Papper version: info:eu-repo/semantics/publishedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Polymer. 283 126262-
APA: Guerrero, Federico; Gamardella, Francesco; Ramis, Xavier; De la Flor, Silvia; Serra, Angels (2023). The use of lanthanide triflates in the preparation of poly(thiourethane) covalent adaptable networks. Polymer, 283(), 126262-. DOI: 10.1016/j.polymer.2023.126262
Entity: Universitat Rovira i Virgili
Journal publication year: 2023
Publication Type: Journal Publications
Repositori URV