Polyurethane (PU) based composites were fabricated by cross-linking hydroxyl-terminated polybutadiene (HTPB) chains with modified graphene oxide (MGO). The MGO worked as both the reinforcing agent and the cross-linker and strong interface between MGO sheets and PU matrix was formed, which provide the MGO/PU composites with well improved properties. Compared to neat PU and traditional direct-mixing GO/PU composites, the elastic modulus and tensile strength of 1 wt% MGO/PU composites increase significantly by 195.3% and 63.8%, respectively. Other properties such as thermal stability, anti-creep property and dynamic shear moduli are also much improved. All the improvements come from the enhanced interface bonding between MGO and PU, as well as dense molecular chains network in the composites. It can be expected that cross-linking method would be an effective fabrication approach and interface controlling strategy for the development of high-performance composites.

聚氨酯（PU）基复合材料是通过将羟基封端的聚丁二烯（HTPB）链与改性氧化石墨烯（MGO）交联而制备的。MGO既是增强剂又是交联剂，在MGO片材与PU基体之间形成了牢固的界面，为MGO / PU复合材料的性能带来了很大的改善。与纯PU和传统的直接混合GO / PU复合材料相比，1 wt％的MGO / PU复合材料的弹性模量和拉伸强度分别显着提高了195.3％和63.8％。其他性能，例如热稳定性，抗蠕变性和动态剪切模量也大大提高。所有的改进都来自MGO和PU之间增强的界面键，以及复合材料中的致密分子链网络。