Author, as appears in the article.: Gamardella, Francesco; Munoz, Sara; De la Flor, Silvia; Ramis, Xavier; Serra, Angels
Department: Química Analítica i Química Orgànica Enginyeria Mecànica
e-ISSN: 2073-4360
URV's Author/s: De la Flor Lopez, Silvia / Gamardella, Francesco / MUÑOZ MAGALLON, SUSANA / Serra Albet, Maria Angels
Keywords: Vitrimers Thermosets Recyclability Poly(thiourethane) Organocatalyst Covalent adaptable networks
Abstract: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. A new type of tetraphenylborate salts derived from highly basic and nucleophilic amines, namely 1,5-diazabicyclo[4.3.0]non-5-ene (DBN), 1,8-diazabicyclo(5.4.0)undec-7-ene (DBU) and triazabicyclodecene (TBD), was applied to the preparation of networked poly(thiourethane)s (PTUs), which showed a vitrimer-like behavior, with higher stress-relaxation rates than PTUs prepared by using dibutyl thin dilaurate (DBTDL) as the catalyst. The use of these salts, which release the amines when heated, instead of the pure amines, allows the formulation to be easily manipulated to prepare any type of samples. The materials prepared from stoichiometric mixtures of hexamethylene diisocyanate (HDI), trithiol (S3) and with a 10% of molar excess of isocyanate or thiol were characterized by FTIR, thermomechanical analysis, thermogravimetry, stress-relaxation tests and tensile tests, thus obtaining a complete thermal and mechanical characterization of the materials. The recycled materials obtained by grinding the original PTUs and hot-pressing the small pieces in the optimized time and temperature conditions were fully characterized by mechanical, thermomechanical and FTIR studies. This allowed us to confirm their recyclability, without appreciable changes in the network structure and performance. From several observations, the dissociative interchange trans-thiocarbamoylation mechanism was evidenced as the main responsible of the topological rearrangements at high temperature, resulting in a vitrimeric-like behavior.
Thematic Areas: Polymers and plastics Polymer science Odontología General chemistry Farmacia Engenharias ii Ciências biológicas ii Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: angels.serra@urv.cat silvia.delaflor@urv.cat
Author identifier: 0000-0003-1387-0358 0000-0002-6851-1371
Record's date: 2024-11-02
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://www.mdpi.com/2073-4360/12/12/2913
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Polymers. 12 (12): 1-18
APA: Gamardella, Francesco; Munoz, Sara; De la Flor, Silvia; Ramis, Xavier; Serra, Angels (2020). Recyclable organocatalyzed poly(Thiourethane) covalent adaptable networks. Polymers, 12(12), 1-18. DOI: 10.3390/polym12122913
Article's DOI: 10.3390/polym12122913
Entity: Universitat Rovira i Virgili
Journal publication year: 2020
Publication Type: Journal Publications