论文部分内容阅读
以六种不同分子量分布特征的聚乙烯为研究对象,通过动态流变、高压毛细管流变以及凝胶渗透色谱(GPC)等分析测试手段,对这六种聚乙烯的结构和性能进行对比分析。高压毛细管的结果表明,A样品表现出更好加工稳定性和更宽的加工速率窗口,结合该样品的分子量及分子量分布特别是动态流变行为,笔者认为,样品中高低分子量部分的微相分布状态对体系系带分子的形成及材料的应用性能具有重要影响,从而为双峰分布聚乙烯的核心结构的表征和性能预测提供快速有效的方法。
Six kinds of polyethylene with different molecular weight distributions were selected as the research objects. The structures and properties of the six kinds of polyethylene were analyzed by dynamic rheological, high pressure capillary rheology and gel permeation chromatography (GPC). The results of high pressure capillary showed that the A sample showed better processing stability and a wider processing rate window. Combined with the molecular weight and molecular weight distribution of the sample, especially the dynamic rheological behavior, the authors believe that the micro-phase distribution of high and low molecular weight parts The state has an important influence on the formation of system tether molecules and the application properties of the materials, thus providing a fast and effective method for the characterization and performance prediction of the core structure of bimodal polyethylene.