NOVEL WINDMILL-LIKE MORPHOLOGY OF POLYETHYLENE MELT-CRYSTLLIZED FROM SPIN-COATED THIN FILM
A strikingly novel morphology of high-density polyethylene (HDPE) crystal obtained upon melt crystallization of spin-coated thin film has been intensively investigated by transmission election microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM) and polarized Optical microscopy (POM). This windmill-like crystal contains a number of petals of which the thickness is much higher than the corresponding twist lamellar overgrowth, in particular the central junction part of the petals. Therefore, this core will be partially preserved during the melting process and serve as nucleus for the subsequent crystal growth. It is found that each petal is actually composed of terrace stacked PE lamellae, in which the polymer chains within crystallographic a-c planes adopt ~45° tilting around 6-axis. The surrounding domains associated to a petal of the windmill composed of twisted lamellar overgrowths with an identical orientation of their long axis, which is the crystallographic b-axis shared by the petal and its corresponding twisted lamellar overgrowths. The parameters involving molecular structure of the materials, preparation history of the specimen and subsequent crystallization conditions which possibly influence the formation of this novel morphology have been subsequently discussed. The acquisition of this novel morphology should be linked to the special thermodynamic history and large-scale uniformity of the thin film prepared via hot spin-coating method.
Jie Wang Xiaoniu Yang Enle Zhou
State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Graduate School of the Chinese Academy of Sciences,Renmin Str.5625,Changchun 130022,P.R.China
国际会议
International Symposium on Polymer Physics(2008年国际高分子物理学术会议PP2008)
厦门
英文
89-90
2008-06-08（万方平台首次上网日期，不代表论文的发表时间）