摘要
通过扫描电子显微镜、相差显微镜研究了反应器直接制备的双峰高密度聚乙烯(HDPE)的结构。结果表明:双峰HDPE的冲击断面以及混合溶剂刻蚀掉低相对分子质量组分后的断面,均未得到可靠的两相分布形貌;熔融后的双峰HDPE存在明显的近似于双相连续的微相分离结构,这种结构与HDPE中的高相对分子质量组分的分散状态有关。对于存在微相分离的双峰HDPE,进一步进行熔融加工,相差显微镜下观察到试样的微相分离结构消失所需的时间更短,可促进高相对分子质量组分与低相对分子质量组分的均匀分散,提高了聚乙烯的力学性能。
The structure of bimodal high density polyethylene(HDPE)prepared directly from reactor was observed by X-ray microanalyzer and phase contrast microscope.The results show that no phase-separated structure can be detected on the impact fracture and fracture surface of HDPE samples after etching the low-molecular weight components by mixed solvent.However,there is a typical microphase-separated structure similar to bi-continuous structure in the melted bimodal HDPE,which depends on the dispersion state of high-molecular weight components.The melt-processing shortens the time required for the disappearance of the micro-phase-separated structure of the samples,which can facilitate the homogenization between the high-molecular weight and low-molecular weight components and consequently improve the mechanical properties of HDPE.
作者
郭敏
潘国元
张杨
刘轶群
吴长江
Guo Min;Pan Guoyuan;Zhang Yang;Liu Yiqun;Wu Changjiang(SINOPEC Beijing Research Institute of Chemical Industry,Beijing 100013,China)
出处
《合成树脂及塑料》
CAS
北大核心
2020年第3期70-74,共5页
China Synthetic Resin and Plastics
关键词
双峰高密度聚乙烯
相结构
微相分离
拉伸性能
bimodal high density polyethylene
phase structure
micro-phase separation
tensile property
