Electroactive shape-memory polyurethane composites incorporating carbon nanotubes
Electroactive shape-memory polyurethane composites incorporating carbon nanotubes
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DOI：
10.1002/marc.200400492
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发表时间：
2005-03-04
影响因子：
4.6
通讯作者：
Goo, NS
中科院分区：
文献类型：
--
作者：
Cho, JW;Kim, JW;Goo, NS
使用导电聚氨酯（PU）复合材料和多壁碳纳米管（MWNT）合成了电活性形状记忆复合材料。 MWNT 的表面改性（通过酸处理）提高了复合材料的机械性能。随着表面改性MWNT含量的增加，模量和100%伸长时的应力增加，而断裂伸长率下降。 MWNT 表面改性也导致复合材料电导率下降，然而，随着表面改性 MWNT 含量的增加，电导率也随之增加（在 5 wt.-% 改性 MWNT 含量的样品中获得了 10(-3) S (.) cm(-1) 数量级）。表面改性的 MWNT 复合材料观察到电活性形状恢复，能量转换效率为 10.4%。因此，PU-MWNT 复合材料可能被证明是用作智能执行器的有希望的候选者。
Electro-active shape-memory composites were synthesized using conducting polyurethane (PU) composites and multi-walled carbon nanotubes (MWNTs). Surface modification of the MWNTs (by acid treatment) improved the mechanical properties of the composites. The modulus and stress at 100% elongation increased with increasing surface-modified MWNT content, while elongation at break decreased. MWNT surface modification also resulted in a decrease in the electrical conductivity of the composites, however, as the surface modified MWNT content increased the conductivity increased (an order of 10(-3) S (.) cm(-1) was obtained in samples with 5 wt.-% modified-MWNT content). Electro-active shape recovery was observed for the surface-modified MWNT composites with an energy conversion efficiency of 10.4%. Hence, PU-MWNT composites may prove promising candidates for use as smart actuators.