توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Fabrication of melt blended HDPE\EVA microporous flat sheet membranes via TIPS method
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۴
Polyethylene has many desirable properties including appropriate thermal and physicochemical stabilities. However, microporous PE membranes suffer from poor wettability and biocompatibility, which limit their potential application in aqueous solution separation and biomedical purposes. In this work, blending method was used to modify some un favorite properties such as hydrophilicity and anti–fouling of PE microporous membranes. Hydrophilic microporous flat sheet membranes were prepared using melt blended high density polyethylene (HDPE) and ethylene vinyl acetate (EVA) via thermally induced phase separation (TIPS) method. PE and EVA were used as polymeric mixture and paraffin oil was used as diluent. Homogeneous polymer–diluent samples were prepared at 220° C and were cast over pre–heated flat glass plate to fabricate flat sheet polymeric microporous membranes. Pure PE microporous membranes were also fabricated as a reference sample. Fabricated microporous membranes were characterized in terms of water permeability and mechanical property (elongation at break). Obtained results with melt blended polymeric microporous membranes were compared with pure high density poly ethylene membranes. In comparison with pure HDPE membrane, HDPE\EVA blend membranes exhibit higher water permeation as well as higher mechanical strength. Since increasing of the permeability would result in lower mechanical strength and vice versa in common membrane operational trade–off curve, the obtained results were a kind of hope giving findings to improve the hydrophilic properties of PE microporous membrane and mechanical strength, simultaneously. These results indicated that melt blended HDPE–EVA should be a novel candidate for the preparation of hydrophilic HDPE microporous membranes via TIPS method.<\div>

۲A novel hydrophilized blended HDPE\EVA microporous flat sheet membranes via thermally induced phase separation (TIPS) method
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۷
In this work, hydrophilic microporous flat sheet membranes were prepared using binary blended of high density polyethylene (HDPE) and ethylene vinyl acetate (EVA) via thermally induced phase separation (TIPS). Polyethylene and ethylene vinyl acetate were used as polymeric mixture and paraffin oil was used as diluent. Homogeneous polymer–diluent samples were prepared in three different ratios of EVA to HDPE, while the total polymer–diluent ratio was kept constant. The hot blended polymeric mixtures were cast over pre–heated flat glass at 180oC to fabricate flat plate polymeric membranes. The cast polymeric solution immerseed in water bath contaning water at 60oC. The fabricated HDPE\EVA blended membranes showed that with increasing the EVA ratio to HDPE, the water permeation as well as mechanical strength considerably increased.<\div>
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