文献类型：期刊文献

英文题名：Morphology and barrier mechanism of biaxially oriented poly(ethylene terephthalate)/poly(ethylene 2,6-naphthalate) blends

作者：Wu, Wei[1]; Wagner, Manfred H.[2]; Qian, Qi[1]; Pu, Weiguang[1]; Kheirandish, Saeid[2]

机构：[1]E China Univ Sci & Technol, Petrochem Inst, Shanghai 201512, Peoples R China;[2]Tech Univ Berlin, D-10623 Berlin, Germany

年份：2006

卷号：101

期号：3

起止页码：1309

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20063010022462);WOS:【SCI-EXPANDED(收录号:WOS:000238637300010)】；

语种：英文

外文关键词：blends; drawing; gas permeation; morphology

摘要：To improve the barrier properties of poly(ethylene terephthalate) (PET), PET/poly(ethylene 2,6-naphthalate) (PEN) blends with different concentrations of PEN were prepared and were then processed into biaxially oriented PET/PEN films. The air permeability of bioriented films of pure PET, pure PEN, and PET/PEN blends were tested by the differential pressure method. The morphology of the blends was studied by scanning electron microscopy (SEM) observation of the impact fracture surfaces of extruded PET/PEN samples, and the morphology of the films was also investigated by SEM. The results of the study indicated that PEN could effectively improve the barrier properties of PET, and the barrier properties of the PET/PEN blends improved with increasing PEN concentration. When the PEN concentration was equal to or less than 30%, as in this study, the PET/PEN blends were phase-separated; that is, PET formed the continuous phase, whereas PEN formed a dispersed phase of particles, and the interface was firmly integrated because of transesterification. After the PET/PEN blends were bioriented, the PET matrix contained a PEN microstructure consisting of parallel and extended, separate layers. This multilayer microstructure was characterized by microcontinuity, which resulted in improved barrier properties because air permeation was delayed as the air had to detour around the PEN layer structure. At a constant PEN concentration, the more extended the PEN layers were, the better the barrier properties were of the PET/PEN blends. (c) 2006 Wiley Periodicals, Inc.