Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano-shi 380-8553, Japan.
Macromol Rapid Commun. 2012 Apr 23;33(8):628-34. doi: 10.1002/marc.201100674. Epub 2012 Feb 13.
We report a mechanically strong, electrically and thermally conductive, and optically transparent shape-memory polyurethane composite which was fabricated by introducing a small amount (0.1 wt%) of high-quality graphene as a filler. Geometrically large (≈4.6 μm(2)), but highly crystallized few-layer graphenes, verified by Raman spectroscopy and transmission electron microscopy, were prepared by the sonication of expandable graphite in an organic solvent. Oxygen- containing functional groups at the edge plane of graphene were crucial for an effective stress transfer from the graphene to polyurethane. Homogeneously dispersed few-layered graphene enabled polyurethane to have a high shape recovery force of 1.8 MPa cm(-3). Graphene, which is intrinsically stretchable up to 10%, will enable high-performance composites to be fabricated at relatively low cost and we thus envisage that such composites may replace carbon nanotubes for various applications in the near future.
我们报告了一种机械强度高、导电和导热、光学透明的形状记忆聚氨酯复合材料，该复合材料是通过引入少量（0.1wt%）高质量石墨烯作为填充剂制备的。通过超声膨胀石墨在有机溶剂中制备了具有较大几何尺寸（≈4.6μm(2)）但高度结晶的少层石墨烯，通过拉曼光谱和透射电子显微镜进行了验证。石墨烯边缘平面上的含氧官能团对于从石墨烯到聚氨酯的有效应力传递至关重要。均匀分散的少层石墨烯使聚氨酯具有 1.8MPa·cm(-3)的高形状回复力。石墨烯本身可拉伸至 10%，这将使高性能复合材料能够以相对较低的成本制造，因此我们预计这种复合材料可能在不久的将来替代碳纳米管，用于各种应用。
