Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 68, Issue 3-4, Pages 978-986Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2007.07.021
Keywords
nanostructures; smart materials; polymer-matrix composites; mechanical properties; self-healing materials
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We report an in situ encapsulation method demonstrating over an order of magnitude size reduction for the preparation of urea-formaldehyde (UF) capsules filled with a healing agent, dicyclopentadiene (DCPD). Capsules with diameters as small as 220 nm are achieved using sonication techniques and an ultrahydrophobe to stabilize the DCPD droplets. The capsules possess a uniform UF shell wall (77 nm average thickness) and display good thermal stability. By controlling the zeta-potential, the capsules are uniformly dispersed in an epoxy matrix and shown to cleave rather than debond upon fracture of the matrix. Mechanical properties of the epoxy/capsule composite, including mode-I fracture toughness, elastic modulus, and ultimate tensile strength are measured and compared to previous data for larger capsules (ca. 180 mu m). (c) 2007 Elsevier Ltd. All rights reserved.
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