高密度聚乙烯/木粉复合材料的热氧老化(Ⅰ)——增容剂及抗氧剂对复合材料耐热氧老化的效果对比

采用高密度聚乙烯、木粉为原料,采用模压工艺制备木塑复合材料,通过力学性能及热性能的研究,对比分析了界面增容剂马来酸酐接枝聚乙烯(MAPE)及不同抗氧剂对木塑复合材料耐热氧老化性能的影响.结果表明,未老化前,使用25%的MAPE可使木塑复合材料的拉伸强度、弯曲强度及冲击强度分别提高68.65%、29.60%和67.53%,所用的3种抗氧剂同样都可提高复合材料的弯曲强度及冲击强度,但均将降低复合材料的拉伸强度.热氧老化600h后,MAPE改性的木塑复合材料具有最高的强度值,耐老化效果优于使用抗氧剂的木塑复合材料,更明显优于未改性的木塑复合材料.使用MAPE及抗氧剂均可提高老化后复合材料的热稳定性,但MAPE增容将提高木塑复合材料的起始熔融温度,而抗氧剂却将降低复合材料的起始熔融温度.

Thermo-oxidative Aging of High Density Polyethylene/Wood Flour Composites(Ⅰ)——Comparative Study on the Effect of Compatibilizing Agent and Antioxidants on the Thermo-oxidative Aging of the Composites

Wood-plastic composites(WPC) are prepared by the compression molding process using the high density polyethylene and wood flour as raw materials.The effects of using maleic anhydride grafted polyethylene as compatibilizing agent and different antioxidants on the anti-thermo-oxidative aging of WPC are studied by testing the mechanical and thermal properties.The results show that,before aging,using MAPE by 25% can improve the tensile,flexural and impact strengths of WPC by 68.65%,29.60% and 67.53% respectivel...