Universität zu Köln

Hohlbein, N., Shaaban, A., Bras, A. R., Pyckhout-Hintzen, W. and Schmidt, A. M. (2015). Self-healing dynamic bond-based rubbers: understanding the mechanisms in ionomeric elastomer model systems. Phys. Chem. Chem. Phys., 17 (32). S. 21005 - 21018. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 1463-9084

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Abstract

While it is traditionally accepted that the chain interactions responsible for the elastic response in an elastomeric network are ideally permanent and instantaneously active, the ongoing investigation of self-healing materials reveals that the introduction of self-healing properties into elastomers requires high mechanical integrity under dynamic load conditions, while on long timescales (or at extended temperatures), the chain and bond dynamics must allow for an intrinsic repair of micro cracks occurring during operation and aging. Based on an acrylate-based amorphous ionomer model system with pendant carboxylate groups allowing the systematic variation of the composition and the nature of the counter ion, we demonstrate the interrelation between the morphological, thermal, and mechanical properties, and identify the prerequisites and tools for property adjustment and optimization of self-healing efficiency. While the ion fraction is directly related to the effective network density and elastic performance, the crossover frequency between viscous and elastic behavior is influenced by the nature of the counter ion. In order to achieve reliable elastic response and optimal damage repair, the ion fraction in these systems should be in the range of 5 mol% and the chain dynamics should be appropriate to allow for excellent self-healing behavior at moderate healing temperatures.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hohlbein, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shaaban, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bras, A. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pyckhout-Hintzen, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, A. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-419665
DOI:	10.1039/c5cp00620a
Journal or Publication Title:	Phys. Chem. Chem. Phys.
Volume:	17
Number:	32
Page Range:	S. 21005 - 21018
Date:	2015
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	1463-9084
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language X-RAY-SCATTERING; POLY(STYRENE-RAN-METHACRYLIC ACID) IONOMERS; SULFONATED POLYSTYRENE IONOMERS; RADICAL POLYMERIZATION; DIBLOCK COPOLYMERS; POLYMERS; MORPHOLOGY; BEHAVIOR; NETWORKS; SHAPE Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/41966