【摘要】 文章报道了低密度聚乙烯（LDPE）和三元乙丙共聚物的共混物,经⁶⁰Co-γ射线辐照后的辐射交联规律以及结构与性能的变化。实验结果表明,这种共混物的辐射交联规律和单独LDPE或EPDM的辐射交联具有类似之处,其交联规律按共混物中占优势的聚合物交联方式进行。经⁶⁰Co-γ射线辐照后这种共混物的结构和性能发生了变化。结晶度、密度和其它物理性能与共混物中两种聚合物的组成有着密切关系。辐照剂量的改变对同一组成共混物的结晶度和密度影响较小,但是,它对力学性能有显著影响。更多还原

【Abstract】 The regularity of radiation crosslinking and the radiation effect on thestructure and property of LDPE （low density polyethylene）-EPDM （copolymerof ethylene-propylene） blends are reported in this paper. The results show that radiation crosslinking effect on LDPE/EPDM blendsis either similar to pure LDPE or EPDM, depending upon which one is the main component in the blends. When the content of LDPE is higher than that ofEPDM, crosslinking of the blend is close to pure LDPE. The relationship betweenS+S^1/2 and 1/R does not comply with Charlesby-Pinner’s equation. While forblends rich in EPDM, a linear relationship is observed at high doses. The higherthe content of EPDM in the blend, the easier is the blend to be crosslinkedbecause of the presence of unsaturated bond in EPDM. The crystalline extent and density of the blend increases with increasingLDPE content in the blends. No obvious change of crystalline extent is observedin the dose range used. There is a close relationship between mechanical property and composition ofthe blends. The tensile strength （T_s） increases with increase in LDPE content,whereas the elongation （E%） shows a reverse effect. The effect of radiation doseon T_s is insignificant. However the elongation （E%） is seriousely affected.更多还原