Nanocapsules for self-healing materials

被引：317

作者：

Blaiszik, B. J. ^{[1
]}

Sottos, N. R. ^{[1
,2
,4
]}

White, S. R. ^{[3
,4
]}

机构：

[1] Univ Illinois, Theoret & Appl Mech Program, Dept Mech Sci & Engn, Urbana, IL 61801 USA

[2] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

[3] Univ Illinois, Dept Aerosp Engn, Urbana, IL 61801 USA

[4] Univ Illinois, Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2008年 / 68卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

nanostructures; smart materials; polymer-matrix composites; mechanical properties; self-healing materials;

D O I：

10.1016/j.compscitech.2007.07.021

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

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.

引用

页码：978 / 986

页数：9

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