Effect of polyethylene crystallinity and extractant on the structure of membranes fabricated via thermally induced phase separation
محل انتشار: بیست و هفتمین کنفرانس شیمی آلی ایران
سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 326
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شناسه ملی سند علمی:
ISOC27_200
تاریخ نمایه سازی: 19 اسفند 1399
چکیده مقاله:
Polymeric membranes dominate the membrane separation field because they are well developed and quite competitive in separation performance and economics1. The thermally induced phase separation (TIPS) process is one of the most useful techniques to prepare the porous membranes. A lot of studies have been reported on the effect of different parameters on membrane structure fabricated via TIPS method. There is little research about the extractant effect on membrane morphology. In this work linear low density polyethylene and high density polyethylene were extracted by acetone and hexane extractants and their microstructures were compared. Fig. 1(a) and 1(b) show microstructure of linear low density polyethylene and high density polyethylene were extracted by acetone. Acetone has no effect on their structure and porous structures were obtained. As shown in Fig. 1 (c), LLDPE extracted by hexane is dense. Solubility parameter of hexane and polyethylene is close, so hexane can swell amorphous region of LLDPE. Swelling of polymer cause to closing the pores and dense structure obtained. Figure 1(d), shows the SEM images of HDPE by hexane. It seems that difference in HDPE and LLDPE crystallinity, causes that hexane change LLDPE structure. It can be concluded that in polymers with low crystallinity, solubility parameters of polymer and extractant should be different with each other.
کلیدواژه ها:
نویسندگان
Elham Shokri
Department of Chemical Engineering, University of Bonab, Bonab, Iran
Reza Yegani
Faculty of Chemical Engineering Department, Sahand University of Technology, Tabriz, Iran. Membrane Technology Research Center, Sahand University of Technology, Tabriz, Iran