Issue 7, 2020

Epoxy vitrimers incorporating physical crosslinks produced by self-association of alkyl chains

Abstract

Epoxy vitrimers were synthesized employing stoichiometric amounts of diglycidyl ether of bisphenol A (DGEBA), sebacic acid (20% eq.) and an n-alkylamine, either octylamine (OA), dodecylamine (DA) or hexadecylamine (HA) (80% eq.). Apart from the chemical crosslinks generated by diester groups formed in transesterification reactions, these vitrimers include physical crosslinks arising from self-association of alkyl chains. The relative fraction and strength of physical crosslinks was high for octylamine (OA), intermediate for dodecylamine (DA) and low for hexadecylamine (HA). This was reflected by rubbery moduli that increased significantly from HA to OA. The covalently bonded tertiary amine generated in the epoxy-amine addition reaction was an efficient catalyst of transesterification reactions. Relatively fast stress relaxation rates were observed driven by transesterification reactions coupled to the dynamic exchange of self-associated alkyl chains. The occurrence of this last mechanism was evidenced by the stress relaxation observed for the linear polymer synthesized with stoichiometric amounts of DGEBA and OA that forms a permanent network up to temperatures close to degradation due to the presence of a high fraction of self-associated n-octyl chains. These vitrimers might find applications in several fields such as soft robotics, electro and magnetorheological elastomers, soft tissues and in additive manufacturing.

Graphical abstract: Epoxy vitrimers incorporating physical crosslinks produced by self-association of alkyl chains

Supplementary files

Article information

Article type
Paper
Submitted
29 ربيع الأول 1441
Accepted
08 جمادى الأولى 1441
First published
11 جمادى الأولى 1441

Polym. Chem., 2020,11, 1337-1347

Epoxy vitrimers incorporating physical crosslinks produced by self-association of alkyl chains

F. I. Altuna, U. Casado, I. E. dell'Erba, L. Luna, C. E. Hoppe and R. J. J. Williams, Polym. Chem., 2020, 11, 1337 DOI: 10.1039/C9PY01787A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements