Shape memory polymer nanocomposites

被引:336
作者
Gall, K [1 ]
Dunn, ML
Liu, YP
Finch, D
Lake, M
Munshi, NA
机构
[1] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA
[2] Composite Technol Dev Inc, Lafayette, CO 80026 USA
基金
美国国家科学基金会;
关键词
shape memory polymer; active material; nano-particulate SiC; composites;
D O I
10.1016/S1359-6454(02)00368-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The paper describes the fabrication and characterization of composites with a shape memory polymer matrix and SiC nanoparticulate reinforcements. Composites based on a SMP matrix are active materials capable of recovering relatively large mechanical strains due to the application of heat. The composites were synthesized from a commercial shape memory polymer resin system and particulate SiC with an average diameter of 300 nm. Composites with weight fractions of 10%, 20%, 30%, and 40% nanoparticulate SiC were fabricated by casting samples with sizes ranging from a few hundred microns to several millimeters. The former size scale is consistent with a microcasting process for manufacturing microelectomechanical systems. The micro-hardness and elastic modulus of the nanocomposites increased by approximately a factor of 3 with the addition of 40 wt% SiC into the base resin. Unconstrained strain recoverability of the nanocomposites was found to depend on the fraction of SiC. For 180degrees bend tests, the recoverability of the nanocomposites was perfect for SiC weight fractions below 40%. For 40 wt% SiC, permanent bend strains were discovered. Constrained bending recovery force in the nanocomposites was shown to increase by 50% with the addition of 20 wt% SiC. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:5115 / 5126
页数:12
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