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Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets
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 t...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8153274/ https://www.ncbi.nlm.nih.gov/pubmed/34068369 http://dx.doi.org/10.3390/polym13101571 |
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author | Gamardella, Francesco Serra, Angels Ramis, Xavier De la Flor, Silvia |
author_facet | Gamardella, Francesco Serra, Angels Ramis, Xavier De la Flor, Silvia |
author_sort | Gamardella, Francesco |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-8153274 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-81532742021-05-27 Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets Gamardella, Francesco Serra, Angels Ramis, Xavier De la Flor, Silvia Polymers (Basel) Article 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. MDPI 2021-05-13 /pmc/articles/PMC8153274/ /pubmed/34068369 http://dx.doi.org/10.3390/polym13101571 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Gamardella, Francesco Serra, Angels Ramis, Xavier De la Flor, Silvia Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets |
title | Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets |
title_full | Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets |
title_fullStr | Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets |
title_full_unstemmed | Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets |
title_short | Actuator Behaviour of Tailored Poly(thiourethane) Shape Memory Thermosets |
title_sort | actuator behaviour of tailored poly(thiourethane) shape memory thermosets |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8153274/ https://www.ncbi.nlm.nih.gov/pubmed/34068369 http://dx.doi.org/10.3390/polym13101571 |
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