The alkali-catalyzed alcoholysis of polyethylene vinyl acetate (EVA) was used to obtain the product ethylene-vinyl alcohol copolymer (EVAL), and the grafting product poly(ethylene-vinyl alcohol)-graphene oxide (EVAL-GO) was prepared in the form of chemical grafting by utilization of the groups on the surface of GO and EVAL through the esterification reaction. The products were analyzed by Fourier transform infrared (FTIR), ¹H nuclear magnetic resonance (NMR) and Thermogravimetric (TG). The rheological properties of the oil sample and changes in the morphology of wax crystals were characterized by Advanced Hybrid Rheometer and polarized optical microscopy (POM) respectively. The degree of alcoholysis of EVAL reached 74.51%, and the grafting rate of EVAL-GO (0.5%) was 36.18%. Reduction of pour point and gel point of nanocomposite treated crude oil was 12 °C and 4 °C from undoped crude oil at the optimum additive concentration of 1000 mg/kg. Moreover, it decreased the viscosity and yield value of virgin crude oil by 99.5% and 78.3%, respectively. From the morphological analysis, it was indicated that EVAL-GO could make the wax crystals form sphere-like crystals, and the increased void space promoting more liquid oil to be released thus significantly improving the low-temperature fluidity of Daqing waxy crude oil.

采用碱催化醇解聚乙烯醋酸乙烯酯(EVA)得到产物乙烯-乙烯醇共聚物(EVAL)，接枝产物聚(乙烯-乙烯醇)-氧化石墨烯(EVAL-GO)制备如下：通过酯化反应利用 GO 和 EVAL 表面的基团形成化学接枝形式。产物通过傅里叶变换红外 (FTIR) 分析，¹H 核磁共振 (NMR) 和热重 (TG)。油样的流变特性和蜡晶体形态的变化分别通过高级混合流变仪和偏光显微镜（POM）表征。EVAL的醇解度达到74.51%，EVAL-GO的接枝率（0.5%）为36.18%。在 1000 mg/kg 的最佳添加剂浓度下，纳米复合处理的原油的倾点和凝胶点的降低分别为 12 °C 和 4 °C。此外，它使原始原油的粘度和屈服值分别降低了 99.5% 和 78.3%。形态分析表明EVAL-GO可使蜡晶体形成球状晶体，