Water-based graphene/polyurethane nanocomposite emulsion (DIGN/WPU) was prepared by step-wise polymerization, grafted isocyanate functionalized graphene ( DIGN) to the water-borne polyurethane ( WPU) chain segment.Fourier transform infared spectrometer (FTIR), Atomic Force Microscope (AFM) and scanning electron microscope ( SEM) were used to characterize the structure of the Graphene oxide ( GO) , DIGN, WPU and DIGN/WPU composites .Simultaneously , effects of content of DIGN on emulsion particle size , rheological proper-ties and thermal stability and mechanical properties of the films were systematically studied .The result showed that the nanocomposite emulsion behaves pseudo-plastic fluid with shear-thinning property , and with the increase of the content of DIGN emulsion viscosity , particle size and distribution index increased , the thermal stability of the nano-composites are obviously improved .When the content of DIGN loading reaches 1%, the tensile strength increased by 80.33%,Young ’ s modulus increased by 192.11%, elongation at break decreased by 42.74%.%通过逐步聚合反应将改性氧化石墨烯（ DIGN）接枝到水性聚氨酯（ WPU）链段中，制备得到DIGN／WPU纳米复合乳液。通过IR、AFM、SEM对氧化石墨烯（ GO）、DIGN、WPU及DIGN／WPU纳米复合材料的结构进行表征；并研究了DIGN用量对乳液粒径，流变性能及其胶膜的热稳定性和力学性能的影响。结果表明：DIGN的引入使得乳液具有了假塑性流体特性，并随DIGN含量的增加，乳液黏度，粒径及分布指数增大，纳米复合材料的热稳定性明显改善；当w（ DIGN）＝1wt％时，拉伸强度增加80畅33％，杨氏模量提高192畅11％，断裂伸长率下降了42畅74％。
展开▼
