纳米MgO/高密度聚乙烯复合材料的性能

Performance of nano-MgO/high density polyethylene composites

通过熔融共混法制备了纳米MgO/高密度聚乙烯(nano-MgO/HDPE)复合材料,并对该复合材料的力学性能进行了测试,用SEM对nano-MgO在nano-MgO/HDPE复合材料中的分散情况进行了观测,通过紫外可见光谱研究了复合材料的紫外屏蔽性能,通过TG研究了复合材料的热稳定性,通过DSC研究了复合材料的结晶性能。结果表明:虽然nano-MgO的引入使HDPE的热分解温度有所降低,但nano-MgO的引入提高了HDPE的冲击强度、弯曲强度及紫外屏蔽性能。当nano-MgO含量为2wt%时,nano-MgO/HDPE复合材料的冲击强度比纯HDPE高14%。当nano-MgO含量为4wt%时,nano-MgO/HDPE复合材料的弯曲强度比纯HDPE高18%。nanoMgO在nano-MgO/HDPE复合材料中的分散均匀,且nano-MgO的引入可以促进HDPE的结晶。

Nano-MgO/high-density polyethylene（nano-MgO/HDPE）composites were prepared by melt blending method,and the mechanical properties of the composites were tested.The dispersity of nano-MgO in nano-MgO/HDPE composites was observed by SEM.The ultraviolet-shielding property,thermal stability and crystallization property of nano-MgO/HDPE composites were tested by ultraviolet-visible absorption spectra,TG and DSC respectively.The results show that although the addition of nano-MgO reduces the thermal decomposition temperature of HDPE,it improves the impact strength,flexural strength and ultraviolet-shielding property of HDPE.When the content of nano-MgO is 2wt%,the impact strength of nano-MgO/HDPE composite is 14% higher than that of pure HDPE.When the content of nano-MgO is 4wt%,the flexural strength of nano-MgO/HDPE composite is 18%higher than that of pure HDPE.The nano-MgO,which evenly distributed in nano-MgO/HDPE composites,promotes the crystallization of HDPE.