Autor según el artículo: Gamardella F; Muñoz S; De la Flor S; Ramis X; Serra A

Departamento: Química Analítica i Química Orgànica Enginyeria Mecànica

e-ISSN: 2073-4360

Autor/es de la URV: De la Flor Lopez, Silvia / Gamardella, Francesco / Serra Albet, Maria Angels

Palabras clave: Vitrimers Thermosets Recyclability Poly(thiourethane) Organocatalyst Covalent adaptable networks

Resumen: © 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.

Áreas temáticas: Polymers and plastics Polymer science Odontología General chemistry Farmacia Engenharias ii Ciências biológicas ii Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física

Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/

Direcció de correo del autor: silvia.delaflor@urv.cat angels.serra@urv.cat

Identificador del autor: 0000-0002-6851-1371 0000-0003-1387-0358

Fecha de alta del registro: 2023-02-19

Versión del articulo depositado: info:eu-repo/semantics/publishedVersion

Enlace a la fuente original: https://www.mdpi.com/2073-4360/12/12/2913

URL Documento de licencia: http://repositori.urv.cat/ca/proteccio-de-dades/

Referencia al articulo segun fuente origial: Polymers. 12 (12): 1-18

Referencia de l'ítem segons les normes APA: Gamardella F; Muñoz S; De la Flor S; Ramis X; Serra A (2020). Recyclable organocatalyzed poly(Thiourethane) covalent adaptable networks. Polymers, 12(12), 1-18. DOI: 10.3390/polym12122913

DOI del artículo: 10.3390/polym12122913

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2020

Tipo de publicación: Journal Publications