The effect of linear low density polyethylene (LLDPE) molecular weight on the property of microporous membrane formation via thermally induced phase separation

سال انتشار: 1390
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,532

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شناسه ملی سند علمی:

PPSRC2011_372

تاریخ نمایه سازی: 30 بهمن 1390

چکیده مقاله:

Polymeric membranes have been developed for a variety of industrial applications. Each application imposes specific requirements on the membrane material and membrane structure. In this work microporous linear low density polyethylene (LLDPE) has been prepared via thermally induced phase separation. A homogeneous solution was prepared by melt-blending of two different types of LLDPEs with liquid paraffin. The effect of melt flow index of LLDPE which is attributed to polymer molecular weight, on the porosity and mechanical strength of porous structure was investigated. To the best of our knowledge, this is the first report about the effect of LLDPE molecular weight on membrane porosity in membrane formation via phase separation method. In the specific concentrations of polymers to diluents ratio, increasing the MFI, led to the decrease of mechanical strength and increase of porosity. The results of porosity measurements and tensile analysis showed that LLDPE with MFI=2(LLDPE 220) has bigger pores than LLDPE with MFI=0.9(LLDPE 209). Droplet growth rate depends on the matrix phase viscosity. High MFI, means low molecular weight was caused to low viscosity. Low viscosity in LLDPE 220 system could allow a faster droplet growth than the LLDPE 209 system. As a consequence, lower viscosity contributes to the LLDPE 220 sample having larger pores than the LLDPE 209 sample.

کلیدواژه ها:

Polymeric membrane ، Melting flow index ، Phase separation ، Linear low density polyethylene

نویسندگان

Elham Shokri

Faculty of Chemical Engineering Department, Sahand University of Technology, Tabriz, Iran

Reza Yegani

Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran

Mir Karim Razavi

Membrane Technology Research Center, Sahand University of Technology, Tabriz, Iran

Zahra Goodarzi

Faculty of Chemical Engineering Department, Sahand University of Technology, Tabriz, Iran