中文摘要：

采用磨盘碾磨废旧轮胎橡胶（WTR）／乙烯一醋酸乙烯酯（EVA）复合粉体与高密度聚乙烯（HDPE）熔融共混制备HDPE／WTR共混物，研究磨盘碾磨对HDPE／WTR共混物的形貌结构、结晶行为、流变行为及力学性能的影响。结果表明：WTR与EVA经磨盘碾磨后所得的复合粉体与HDPE熔融共混过程中形成EVA包覆WTR结构，同时WTR颗粒在基体树脂中的分散性及橡塑两相界面的相容性得到改善。此外，磨盘碾磨还能提高HDPE／WTR共混物的结晶温度及结晶度，改善共混物熔体的加工流动性，同时会降低共混物的弹性与黏性。磨盘碾磨与引入的EVA之间存在显著的协效作用，二者协同使用可大幅改善HDPE／WTR共混物的力学性能，如采用碾磨32次复合粉体制备的共混物拉伸强度、断裂伸长率、缺口冲击强度相较未碾磨样品分别提高31．2％、1500％和51．8％。

英文摘要：

The blend of HDPE and waste tire rubber （WTR） was prepared by melt compounding of HDPE with WTR/ EVA co-powders, which were prepared by solid state shear milling method. The influence of pan-milling effect on the morphology structure, crystallization behavior, rheological behavior and mechanical property of the blend were carefully investigated. SEM observation showed that the EVA-encapsulated-WTR structure could be formed through melt compounding of the prepared WTR/EVA co-powders with HDPE, leading to improvement in both the WTR particles dispersion and the interracial compatibility of system. Crystallization behavior analyzes illustrated that the pan-milling could cause the increase in the crystallization temperature and crystallinity of HDPE/WTR blend. Rheologieal measurements indicated that the pan-milling could improve the processing flowability of HDPE/WTR blend meh but lower the viscous and elastic property. In addition, there was very remarkable synergistic effect between pan-milling and EVA incorporation. The combination of both methods could substantially enhance the mechanical properties of HDPE/WTR blend, e.g. upon incorporation of the WTR/EVA co- powders with 32 milling cycles, the obtained blend could have tensile strength, elongation at break and notched impact strength being 31.2% , 1500% and 51.8% higher than that of the unmilled blend sample, respectively.