PE100管材专用料耐压性能与分子结构的分析

Analysis of Molecular Structure and Pressure Resistance of PE100 Pipe Resins

采用凝胶渗透色谱分析(GPC)、管材静液压测试等方法研究并对比了国产Hostalen淤浆工艺生产的不同批次PE100管材专用料HM100的结构与性能,考察了HM100批次性能的稳定性,PE100管材专用料耐压性能与基础物性、力学性能以及分子结构之间的关系。结果表明:HM100批次之间工艺调整频繁,指标波动范围大,导致其管材制品的性能不稳定,尤其是耐压性能;HM100的力学性能与其管材制品的耐压性能无直接相关性;HM100的分子结构不合理,说明其结晶结构以及系带分子结构均存在缺陷,这也是导致部分产品耐压实验不合格最重要的因素之一,因此,必须从聚合工艺的角度进行优化,调控分子结构,进一步提升产品的耐压性能。

The structure and perforinance were investigated by gel permeation chromatography （ GPC ） , pipe hydrostatic test and so on. The performance stability of different product batches and the relationship between molecular structure anti pressure resistance of PE100 pipe resins were studied. The results showed that the polymerization process of HM100 was changed frequently, and the range of indexes was wider than contrast products, so the performance of the pipe was not stable, especially the pressure resistance. There was no direct correlation hetween mechanical properties and pressure resistance for HM100. The molecular structure of HM100 was riot reasonable, which showed that the erystal structure and the molecular structure of the frenulum were defective, and it was also one of the most important factors that affected the performance of the pressure resistance. It should be optimized from the perspective of polymerization process, regulated the molecular structure, and further improved the pressure resistanee of the product.