Low density polyethylene(LDPE)was used as the matrix,4,4'-oxydibenzenesulfonyl hydrazide(OBSH)was used as foaming agent,and metallocene linear low-density polyethylene(MLLDPE)was used as the modifying agent.The series of LDPE/MLLDPE foaming materials were prepared by using the irradiation cross-linking technology.The effects of the content of MLLDPE on the process flow,thermal and foaming behavior and mechanical properties of the LDPE/MLLDPE composite systems were investigated.The result showed that the introduction of MLLDPE could improve the crystallinity of LDPE/MLLDPE composite system and reduce the melt flow rate.With an increase of MLLDPE content,the tensile strength,tearing strength and compressive permanent deformation of LDPE/MLLDPE composite foaming material increased first and then decreased,while the elongation at break and resilience rate increased gradually.When the amount of MLLDPE reached 15 phr,the apparent density,tensile strength,tear strength and the permanent compression of LDPE/MLLDPE composite foaming material increased by 6.8％,24.4％,11.4％and 24.2％,respectively.When the irradiation dose was 80 kGy,LDPE∶MLLDPE=85∶15,the mechanical properties of LDPE/MLLDPE foamed materials could be better and the cell structure could be also even.
关键词
低密度聚乙烯/茂金属线性低密度聚乙烯/力学性能/发泡行为
Key words
low density polyethylene/metallocene linear low-density polyethylene/mechanical properties/foam material
维普
万方数据