摘要
采用熔融共混的方法制备了XLPE/EEA复合材料,参照IEC/TS 61956标准"评定绝缘材料中水树枝化的试验方法",采用水针电极法对纯XLPE和改性XLPE/EEA试样进行加速水树老化试验,通过显微镜观察树枝形态,对树枝的长度进行统计分析。结果表明:与纯XLPE相比,添加了EEA的复合试样的水树枝长度减小至19.5%(顺)和34.9%(垂直)。使用DSC研究了试样水树老化前后的熔融行为和结晶行为,并用显微镜观察了试样腐蚀后的结晶形态和分布,结果显示,水树老化后XLPE/EEA试样结晶度增加,晶体尺寸分布加宽,结晶速率减慢。这些变化与水树老化过程中聚合物发生的微观降解有一定关系。
Crosslinked polyethylene/ethylene-ethyl acrylate（XLPE/EEA） composite was prepared by using melt blending method. Water-tree aging of XLPE and modified samples XLPE/EEA were conducted with water electrode method according to ＂Methods of test for the evaluation of water-tree in insulating materials＂ of IEC/TS 61956. The characters of water-tree were recorded by microscope and statistically analyzed. The results show that： compared with pure XLPE, the addition of EEA can reduce the length of the branch to 19.5%（in the electric field direction） and 34.9%（perpendicular to the main electric field direction）. The melting and crystallization behavior before and after water-tree aging were investigated with DSC analysis. The crystallization morphology and distribution of the specimens were observed with microscope after corrosion. The result indicates that the crystallinity of XLPE/EEA has been increased after water-tree aging. Besides, the crystal size distribution is widened and the crystallization rate is slowed down, which relates to the microscopic degradation phenomenon of polymer molecular chain during water-tree aging.
出处
《塑料科技》
CAS
北大核心
2016年第12期37-42,共6页
Plastics Science and Technology
基金
山东省自然科学基金(ZR2015EL039)
江苏省重点研发计划项目(BE2016024)
