期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 58, 期 -, 页码 65-72出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2013.11.016
关键词
Smart materials; Nano-structures; Thermomechanical; Surface treatments
资金
- R & D Center for Valuable Recycling (Global-Top Environmental Technology Development Program)
- Ministry of Environment [GT-11-C-01-290-0]
High-performance polyurethane nanocomposites with surface-functionalized, nano-layered graphene sheets were fabricated by covalent incorporation. Partially reduced graphene nanosheets or surface-functionalized graphene with diazonium salts carrying phenethyl alcohol groups were physically-blended or covalently-bonded with amorphous polyurethane. FTIR-ATR, XPS, WAXD, and AFM characterization of the graphene demonstrated the surface functional groups and the enlarged interlayer space of the single or few-layered graphene. Functionalized graphene/PU composites with a crosslinked structure, which was introduced by the urethane linkages between the multifunctional graphene and the NCO-terminated PU, showed greater shape memory properties, as well as greater mechanical, thermal, and dynamic mechanical properties, than the reduced graphene/PU composites with good shape memory properties, due to fine dispersion-induced hydrogen interactions. The functionalized graphene/PU showed up to 98% shape fixity and a 94% shape recovery ratio after four cycles, and the hysteresis loss was as low as 2% at an extremely low loading of 0.5%. (C) 2013 Elsevier Ltd. All rights reserved.
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