辐照交联聚乙烯结晶形态的研究

通过差示扫描量热法、X射线-衍射试验研究了辐照交联聚乙烯绝缘材料的结晶形态，发现高密度和低密度聚乙烯辐照交联效应有明显差异。高密度聚乙烯本身结晶能力高于低密度聚乙烯，结晶度大于低密度聚乙烯，同样辐照剂量下高密度聚乙烯交联度低于低密度聚乙烯，晶区限制了交联过程发生；另一方面，辐照对低密度聚乙烯结晶形态的影响较小，辐照对高密度聚乙烯结晶形态影响明显、辐照交联有可能促进聚乙烯的同相结晶过程发生。实验表明，辐照剂量过大会增加高低密度聚乙烯绝缘料聚集态结构的复杂性，降低结晶结构的均匀性。

The morphology research of irradiated cross-linked polyethylene

The differential scanning calorimeter(DSC)and X-ray diffraction are used to research the crystalline morphology of the irradiated cross-linked PE insulation materials.There is obvious difference on irradiation crosslinking effect between HDPE and LDPE.HDPE has higher crystal capability than LDPE,so its crystallity is higher.The crosslinking degree of HDPE is lower than that of LDPE in the same irradiating dose.The crystal regions restrict crosslinking process.On the other hand,the crystal morphology of the LDPE is affected much more than HDPE by irra-diation.Irradiation crosslinking may accelerate the homogeneous phase crystallization of PE.Ex-periments shows that over-dose irradiation will increase the complexity of the morphology struc-ture in PE insulating materials and decrease the uniformity of crystal structure.