Effect of curing on the mechanical and healing behaviour of a hybrid dual network

A time resolved evaluation

Journal article (2016)

Authors

A.M. Grande Novel Aerospace Materials - Aerospace Engineering
S. van der Zwaag Novel Aerospace Materials - Aerospace Engineering
Santiago J. Garcia Novel Aerospace Materials - Aerospace Engineering
Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
Copyright: © 2016 M. Abdolah Zadeh, A.M. Grande, S. van der Zwaag, Santiago J. Garcia
DOI: https://doi.org/10.1039/c6ra17799a
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Published Date

2016

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

Abstract

In the present work we show the effect of the crosslinking degree on the mechanical and healing behaviour of a healable thermoset dual-network polymer. A hyphenated rheological test (i.e. simultaneous rheology and FTIR) was used to follow the effect of the curing process on the mechanical behaviour in relation to the underlying chemical reactions. The effect of curing on the bulk properties and the polymer interfacial healing was studied using gap closure kinetics and a fracture mechanical test. The increased crosslinking density at longer curing times led to a more temperature-stable polymer network with significantly higher mechanical properties (elastic modulus and strength at break). It was found that the damage closure kinetics decrease with the curing degree but the ultimate interfacial healing efficiency does not. The results here reported highlight the effect of the crosslinking density on the kinetics of damage closure with a low impact on the maximum interfacial healing efficiency as long as the amount of reversible bonds remains constant.

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