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Proceedings Paper

Synthesis and characterization of melamine-urea-formaldehyde microcapsules containing ENB-based self-healing agents
Author(s): Xing Liu; Xia Sheng; Jong Keun Lee; Michael R. Kessler
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Paper Abstract

Microcapsules for self-healing applications were produced with a melamine-urea-formaldehyde (MUF) polymer shell containing two different healing agent candidates, ENB (5-ethylidene-2-norbornene) and ENB with 10 wt.% of a norbornene based crosslinking agent (CL), by in-situ polymerization in an oil-in-water emulsion. Relatively neat outer surfaces with minor roughness were observed on the MUF microcapsules under optical and scanning electron microscopy. Shell thickness of the capsules ranged from 700 to 900 nm. Particle size analysis of the microcapsules showed narrow size distributions with a mean diameter of 113 μm for ENB-filled and 122 μm for ENB+CL-filled microcapsules at an agitation rate of 500 rpm. The microcapsules were found to be thermally stable up to 300°C and exhibited a 10 to 15 % weight loss when isothermally held at 150°C for 2 hr from thermogravimetric analysis. Overall, these MUF microcapsules exhibited superior properties compared to the urea-formaldehyde (UF) microcapsules used extensively for self-healing composites to date. In addition, the manufacturing process of MUF microcapsules is much simpler than those made from UF. Additional advantages of MUF microcapsules for self-healing composites are discussed.

Paper Details

Date Published: 28 November 2007
PDF: 9 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 642337 (28 November 2007); doi: 10.1117/12.780057
Show Author Affiliations
Xing Liu, Kumoh National Institute of Technology (South Korea)
Xia Sheng, Iowa State Univ. (United States)
Jong Keun Lee, Kumoh National Institute of Technology (South Korea)
Michael R. Kessler, Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)

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