Self-healing iron oxide polyelectrolyte nanocomposites

Oberhausen, Bastian; Plohl, Ajda; Niebuur, Bart‐Jan; Diebels, Stefan; Jung, Anne; Kraus, Tobias; Kickelbick, Guido

doi:10.3390/nano13232983

Self-healing iron oxide polyelectrolyte nanocomposites

Influence of particle agglomeration and water on mechanical properties

Publication date

2023-11-21

Document type

Forschungsartikel

Author

Oberhausen, Bastian

Plohl, Ajda

Niebuur, Bart‐Jan

Diebels, Stefan

Jung, Anne

Kraus, Tobias

Kickelbick, Guido

Organisational unit

Schutzsysteme

DOI

10.3390/nano13232983

URI

https://openhsu.ub.hsu-hh.de/handle/10.24405/22689

Publisher

MDPI

Series or journal

Nanomaterials

ISSN

2079-4991

Periodical volume

13

Periodical issue

23

First page

2983

Last page

2983

Peer-reviewed

✅

Part of the university bibliography

✅

Language

English

Abstract

Self-healing nanocomposites can be generated by organic functionalization of inorganic nanoparticles and complementary functionalization of the polymer matrix, allowing reversible interactions between the two components. Here, we report on self-healing nanocomposites based on ionic interactions between anionic copolymers consisting of di(ethylene glycol) methyl ether methacrylate, sodium 4-(methacryloyloxy)butan-1-sulfonate, and cationically functionalized iron oxide nanoparticles. The materials exhibited hygroscopic behavior. At water contents < 6%, the shear modulus was reduced by up to 90%. The nanoparticle concentration was identified as a second factor strongly influencing the mechanical properties of the materials. Backscattered scanning electron microscopy and small-angle X-ray scattering measurements showed the formation of agglomerates in the size range of 100 nm to a few µm in diameter, independent of concentration, resulting in the disordering of the semi-crystalline ionic polymer blocks. These effects resulted in an increase in the shear modulus of the composite from 3.7 MPa to 5.6 MPa, 6.3 Mpa, and 7.5 MPa for 2, 10, and 20 wt% particles, respectively. Temperature-induced self-healing was possible for all composites investigated. However, only 36% of the maximum stress could be recovered in systems with a low nanoparticle content, whereas the original properties were largely restored (>85%) at higher particle contents.

Description

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/).

Version

Published version

Access right on openHSU

Metadata only access