Technology Research Association for Single Wall Carbon Nanotubes (TASC) and Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan.
Science. 2010 Dec 3;330(6009):1364-8. doi: 10.1126/science.1194865.
Viscoelasticity describes the ability of a material to possess both elasticity and viscosity. Viscoelastic materials, such as rubbers, possess a limited operational temperature range (for example, for silicone rubber it is -55° to 300°C), above which the material breaks down and below which the material undergoes a glass transition and hardens. We created a viscoelastic material composed from a random network of long interconnected carbon nanotubes that exhibited an operational temperature range from -196° to 1000°C. The storage and loss moduli, frequency stability, reversible deformation level, and fatigue resistance were invariant from -140° to 600°C. We interpret that the thermal stability stems from energy dissipation through the zipping and unzipping of carbon nanotubes at contacts.
黏弹性描述了一种材料同时具有弹性和黏性的能力。黏弹性材料，如橡胶，具有有限的工作温度范围（例如，对于硅橡胶，工作温度范围是-55°C 到 300°C），超过这个范围材料就会失效，低于这个范围材料会发生玻璃化转变并变硬。我们创造了一种由长的相互连接的碳纳米管随机网络组成的黏弹性材料，其工作温度范围从-196°C 到 1000°C。在-140°C 到 600°C 的范围内，存储模量和损耗模量、频率稳定性、可逆变形水平和抗疲劳性都保持不变。我们解释说，这种热稳定性源于通过在接触处的碳纳米管的套叠和解套来耗散能量。
