کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
636926 | 1456133 | 2009 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microporous membranes obtained from PP/HDPE multilayer films by stretching
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Microporous membranes obtained from PP/HDPE multilayer films by stretching Microporous membranes obtained from PP/HDPE multilayer films by stretching](/preview/png/636926.png)
چکیده انگلیسی
Polypropylene/high density polyethylene (PP/HDPE) multilayer as well as monolayer films were prepared to develop microporous membranes using cast film extrusion followed by stretching. The effects of draw ratio (DR), cooling air flow rate (AFR), and annealing on the crystalline structure and orientation of the monolayer and components in the multilayer films were investigated using wide angle X-ray diffraction (WAXD) and Fourier transform infrared (FTIR). Annealing and high DR and AFR enhanced the crystal alignments significantly. However, the orientation of the PP and HDPE in the multilayer film was slightly lower compared to the monolayer films. The amount of lamellae formation, long period spacing (Lp), and lamellae thickness (lc) were obtained via small angle X-ray scattering (SAXS). A significant influence of annealing on Lp and lc was observed for the PP. The row-nucleated lamellar crystallization and transcrystallization observed in the surface and cross-section of the films, respectively, are discussed. Scanning electron microscopy (SEM) images of the membrane surface and cross-section obtained for the cold and hot stretch ratios of 55% and 75%, respectively, showed larger pores and higher porosity for the HDPE layer compared to the PP. As the level of the applied extension during cold stretching increased, the water vapor transmission rate (WVTR) of the HDPE monolayer improved while the effect was inversed for the PP single layer. In addition, compared to the monolayer membranes, the multilayer ones showed smaller WVTR. Tensile properties of the precursor films and microporous membranes in the machine and transverse directions (MD and TD, respectively) as well as puncture resistance in the normal direction (ND) were evaluated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 345, Issues 1â2, 1 December 2009, Pages 148-159
Journal: Journal of Membrane Science - Volume 345, Issues 1â2, 1 December 2009, Pages 148-159
نویسندگان
Seyed H. Tabatabaei, Pierre J. Carreau, Abdellah Ajji,