Fabrication of Highly Thermally Resistant and Self-Healing Polysiloxane Elastomers by Constructing Covalent and Reversible Networks.
crosslinked elastomers
organosilicon
self-healing
thermal degradation mechanism
thermal protection coatings
Journal
Macromolecular rapid communications
ISSN: 1521-3927
Titre abrégé: Macromol Rapid Commun
Pays: Germany
ID NLM: 9888239
Informations de publication
Date de publication:
Sep 2023
Sep 2023
Historique:
revised:
14
05
2023
received:
05
04
2023
medline:
22
9
2023
pubmed:
17
6
2023
entrez:
17
6
2023
Statut:
ppublish
Résumé
The fabrication of self-healing elastomers with high thermal stability for use in extreme thermal conditions such as aerospace remains a major challenge. A strategy for preparing self-healing elastomers with stable covalent bonds and dynamic metal-ligand coordination interactions as crosslinking sites in polydimethylsiloxane (PDMS) is proposed. The added Fe (III) not only serves as the dynamic crosslinking point at room temperature which is crucial for self-healing performance, but also plays a role as free radical scavenging agent at high temperatures. The results show that the PDMS elastomers possessed an initial thermal degradation temperature over 380 °C and a room temperature self-healing efficiency as high as 65.7%. Moreover, the char residue at 800 °C of PDMS elastomer reaches 7.19% in nitrogen atmosphere, and up to 14.02% in air atmosphere by doping a small amount (i.e., 0.3 wt%) of Fe (III), which is remarkable for the self-healing elastomers that contain weak and dynamic bonds with relatively poor thermal stability. This study provides an insight into designing self-healing PDMS-based materials that can be targeted for use as high-temperature thermal protection coatings.
Identifiants
pubmed: 37329201
doi: 10.1002/marc.202300191
doi:
Substances chimiques
Elastomers
0
Siloxanes
0
baysilon
63148-62-9
Dimethylpolysiloxanes
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e2300191Subventions
Organisme : National Natural Science Foundation of China
ID : 52103040
Organisme : State Key Laboratory of Polymer Materials Engineering
ID : sklpme2020-3-06
Organisme : Fundamental Research Funds for the Central Universities
ID : 2023SCU12022
Informations de copyright
© 2023 Wiley-VCH GmbH.
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