Author, as appears in the article.: Gamardella F; De la Flor S; Ramis X; Serra A
Department: Enginyeria Mecànica Química Analítica i Química Orgànica
URV's Author/s: De la Flor Lopez, Silvia / Gamardella, Francesco / Serra Albet, Maria Angels / Serra Masdeu, Anna Isabel Maria
Keywords: Vitrimers Transcarbamoylation Thiol Thermosets Thermoset Recyclability Recovery Polyurethane Polymer networks Poly(thiourethane) Facile Dynamic chemistry Covalent adapatable networks Access
Abstract: © 2020 Elsevier B.V. Networked poly(thiourethane) materials with Tgs around 130 °C, derived from two aliphatic isocyanates (isophorone diisocyanate, IPDI and 4,4′-methylene bis(cyclohexyl isocyanate), HMDI) and one aromatic diisocyanate (toluene-2,4-diisocyanate, TDI) have been prepared with the same trithiol as comonomer (trimethylol propane tris(3-mercaptopropionate), S3) in stoichiometric proportions in the presence of dibutyltin dilaurate (DBTDL) as the catalyst. The higher reactivity of TDI allowed the preparation of this material in absence of catalyst. The evolution of the curing process has been followed by FTIR. Thermomechanical studies have been performed to determine their viscoelastic properties and their vitrimeric behaviour. The materials were able to reach a complete relaxation stress state thanks to the exchange process of the thiourethane moiety. Among them, TDI derived material experimented the fastest relaxation. The materials were also characterized by thermogravimetry and tensile tests. The recycled materials obtained by grinding the original thermosets and hot-pressing the powder have been fully characterized by mechanical, thermomechanical and FTIR studies, which allowed to confirm their recyclability without appreciable changes in the network structure. The presence of DBTDL in the materials has been proved to be necessary to reach a good recyclability.
Thematic Areas: Saúde coletiva Química Polymers and plastics Polymer science Medicina veterinaria Materials chemistry Materiais Interdisciplinar General chemistry General chemical engineering Farmacia Environmental chemistry Engineering, chemical Engenharias iii Engenharias ii Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Chemistry, applied Chemistry (miscellaneous) Chemistry (all) Chemical engineering (miscellaneous) Chemical engineering (all) Biotecnología Biodiversidade Biochemistry Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 1381-5148
Author's mail: angels.serra@urv.cat annaisabel.serra@urv.cat silvia.delaflor@urv.cat
Author identifier: 0000-0003-1387-0358 0000-0001-9353-7154 0000-0002-6851-1371
Record's date: 2024-11-02
Journal volume: 151
Papper version: info:eu-repo/semantics/acceptedVersion
Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S1381514820301966?via%3Dihub
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Reactive & Functional Polymers. 151 (104574):
APA: Gamardella F; De la Flor S; Ramis X; Serra A (2020). Recyclable poly(thiourethane) vitrimers with high Tg. Influence of the isocyanate structure. Reactive & Functional Polymers, 151(104574), -. DOI: 10.1016/j.reactfunctpolym.2020.104574
Article's DOI: 10.1016/j.reactfunctpolym.2020.104574
Entity: Universitat Rovira i Virgili
Journal publication year: 2020
Publication Type: Journal Publications