Articles producció científica> Enginyeria Mecànica

Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets

  • Dades identificatives

    Identificador: imarina:9216846
    Autors:
    Gamardella, FrancescoSerra, AngelsRamis, XavierDe la Flor, Silvia
    Resum:
    In this work, a new family of poly(thiourethane) shape memory thermosetting actuators was developed and characterized. These materials can be easily prepared from mixtures of two different aliphatic diisocyanates and a trithiol in the presence of a latent catalyst, allowing an easy manipulation of the formulation. Rheological studies of the curing process confirm the latent character of the formulations. The glass transition temperatures and the mechanical properties can be modified by varying the proportion of diisocyanates (hexamethylene diisocyanate, HDI, and isophorone diisocyanate, IPDI) with stoichiometric amounts of trimethylolpropane tris(3-mercaptopropionate). The shape-memory behavior was deeply investigated under three different conditions: unconstrained, partially constrained, and fully constrained. Tests were performed in single cantilever bending mode to simulate conditions closer to real complex mechanics of thermomechanical actuators under flexural performances. The complex recovery process in single cantilever bending mode was compared with that obtained using tensile mode. The results evidenced that the amount of recovery force in fully constrained conditions, or energy released during the recovery process in partially constrained, can be modulated by simply changing the proportion of both diisocyanates. A simple model based on Timoshenko beam theory was used for the prediction of the amount of work performed. The reported results are an important guideline to design shape-memory materials based on poly(thiourethane) networks, establishing criteria for the choice of the material depending on the expected application.
  • Altres:

    Autor segons l'article: Gamardella, Francesco; Serra, Angels; Ramis, Xavier; De la Flor, Silvia
    Departament: Enginyeria Mecànica
    Autor/s de la URV: De la Flor Lopez, Silvia / Gamardella, Francesco / Serra Albet, Maria Angels
    Paraules clau: Thiol Thermosets Single cantilever Shape-memory Recovery Polyurethane Polymers Poly(thiourethane) Latency Isocyanate click reaction Chemistry Actuator
    Resum: In this work, a new family of poly(thiourethane) shape memory thermosetting actuators was developed and characterized. These materials can be easily prepared from mixtures of two different aliphatic diisocyanates and a trithiol in the presence of a latent catalyst, allowing an easy manipulation of the formulation. Rheological studies of the curing process confirm the latent character of the formulations. The glass transition temperatures and the mechanical properties can be modified by varying the proportion of diisocyanates (hexamethylene diisocyanate, HDI, and isophorone diisocyanate, IPDI) with stoichiometric amounts of trimethylolpropane tris(3-mercaptopropionate). The shape-memory behavior was deeply investigated under three different conditions: unconstrained, partially constrained, and fully constrained. Tests were performed in single cantilever bending mode to simulate conditions closer to real complex mechanics of thermomechanical actuators under flexural performances. The complex recovery process in single cantilever bending mode was compared with that obtained using tensile mode. The results evidenced that the amount of recovery force in fully constrained conditions, or energy released during the recovery process in partially constrained, can be modulated by simply changing the proportion of both diisocyanates. A simple model based on Timoshenko beam theory was used for the prediction of the amount of work performed. The reported results are an important guideline to design shape-memory materials based on poly(thiourethane) networks, establishing criteria for the choice of the material depending on the expected application.
    Àrees temàtiques: Polymers and plastics Polymer science Odontología General chemistry Farmacia Engenharias ii Ciências biológicas ii Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    Adreça de correu electrònic de l'autor: angels.serra@urv.cat silvia.delaflor@urv.cat
    Identificador de l'autor: 0000-0003-1387-0358 0000-0002-6851-1371
    Data d'alta del registre: 2024-11-02
    Volum de revista: 13
    Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
    Enllaç font original: https://www.mdpi.com/2073-4360/13/10/1571
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    Referència a l'article segons font original: Polymers. 13 (10): 1571-
    Referència de l'ítem segons les normes APA: Gamardella, Francesco; Serra, Angels; Ramis, Xavier; De la Flor, Silvia (2021). Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets. Polymers, 13(10), 1571-. DOI: 10.3390/polym13101571
    DOI de l'article: 10.3390/polym13101571
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2021
    Tipus de publicació: Journal Publications
  • Paraules clau:

    Chemistry (Miscellaneous),Polymer Science,Polymers and Plastics
    Thiol
    Thermosets
    Single cantilever
    Shape-memory
    Recovery
    Polyurethane
    Polymers
    Poly(thiourethane)
    Latency
    Isocyanate click reaction
    Chemistry
    Actuator
    Polymers and plastics
    Polymer science
    Odontología
    General chemistry
    Farmacia
    Engenharias ii
    Ciências biológicas ii
    Chemistry (miscellaneous)
    Chemistry (all)
    Biotecnología
    Astronomia / física
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