Adhesion strength of norbornene-based self-healing agents to an amine-cured epoxy

Guang Chun Huang; Jong Keun Lee; Michael R. Kessler; Sungho Yoon

doi:10.1117/12.840356

20 October 2009 Adhesion strength of norbornene-based self-healing agents to an amine-cured epoxy

Guang Chun Huang, Jong Keun Lee, Michael R. Kessler, Sungho Yoon

Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74935E (2009) https://doi.org/10.1117/12.840356
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China

Abstract

Self-healing is triggered by crack propagation through embedded microcapsules in an epoxy matrix, which then release the liquid healing agent into the crack plane. Subsequent exposure of the healing agent to the chemical catalyst initiates ring-opening metathesis polymerization (ROMP) and bonding of the crack faces. In order to improve self-healing functionality, it is necessary to enhance adhesion of polymerized healing agent within the crack to the matrix resin. In this study, shear bond strength between different norbornene-based healing agents and an amine-cured epoxy resin was evaluated using the single lap shear test method (ASTM D3163, modified). The healing agents tested include endodicyclopentadiene (endo-DCPD), 5-ethylidene-2-norbornene (ENB) and DCPD/ENB blends. 5-Norbornene-2-methanol (NBM) was used as an adhesion promoter, containing hydroxyl groups to form hydrogen bonds with the amine-cured epoxy. A custom synthesized norbornene-based crosslinking agent was also added to improve adhesion for ENB by increasing the crosslinking density of the adhesive after ROMP. The healing agents were polymerized with varying loadings of the 1st generation Grubbs' catalyst at different reaction times and temperatures.

Citation Download Citation

Guang Chun Huang, Jong Keun Lee, Michael R. Kessler, and Sungho Yoon "Adhesion strength of norbornene-based self-healing agents to an amine-cured epoxy", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74935E (20 October 2009); https://doi.org/10.1117/12.840356

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KEYWORDS

Epoxies

Polymers

Liquids

Adhesives

Aluminum

Polymerization

Hydrogen

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