New Polymeric Membranes for Organic Solvent Nanofiltration

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

The focus of this dissertation was the development, synthesis and modification ofpolymers for the preparation of membranes for organic solvent nanofiltration. Highchemical stability in a wide range of solvents was a key requirement. Membranesprepared from synthesized polymers as well as from commercial polymers were designedand chemically modified to reach OSN requirements.A solvent stable thin-film composite (TFC) membrane is reported, which is fabricated oncrosslinked polythiosemicarbazide (PTSC) as substrate. The membranes exhibited highfluxes towards solvents like THF, DMF and DMSO ranging around 20 L/m2 h at 5 barwith a MWCO of around 1000 g/mol.Ultrafiltration PTSC membranes were prepared by non-solvent induced phase separationand crosslinked with GPTMS. The crosslinking reaction was responsible for theformation of an inorganic-type-network that tuned the membrane pore size. Thecrosslinked membranes acquired high solvent stability in DMSO, DMF and THF with aMWCO above 1300 g/mol.Reaction Induced Phase Separation (RIPS) was introduced as a new method for thepreparation of skinned asymmetric membranes. These membranes have two distinctivelayers with different morphologies both from the same polymer. The top dense layer iscomposed of chemically crosslinked polymer chains while the bottom layer is a porousstructure formed by non-crosslinked polymer chains. Such membranes were tested forvitamin B12 in solvents after either crosslinking the support or dissolving the support andfixing the freestanding membrane on alumina.Pebax® 1657 was utilized for the preparation of composite membranes by simple coating.Porous PAN membranes were coated with Pebax® 1657 which was then crosslinkedusing TDI. Crosslinked Pebax® membranes show high stability towards ethanol, propanoland acetone. The membranes were also stable in DMF once crosslinked PAN supportswere used.Sodium alginate polymer was investigated for the preparation of thin film compositemembranes. Composite membranes were prepared using PAN and crosslinked PANsupports; these membranes were tested for methanol and DMF. Freestanding nanofilmsfixed on alumina were also tested for methanol and DMF as well as many other harshsolvents. The alginate composite membranes showed excellent solvent stability and goodpermeances and a MWCO of around 1300 g/mol.

روابط وملفات

التعريف والنوع

رقم الوثيقة

febcf994-f7f6-4382-b60f-481abc0050c1

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

1699475_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Klaus-Viktor","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"جميلة ابو ربيع","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

New Polymeric Membranes for Organic Solvent Nanofiltration

المحتوى والصفحات

عدد الصفحات

0

كلمات الباحثين

Membranes , Organic solvent nanofiltration , Polymers

إشراف وإعداد

الإشراف

Klaus-Viktor

الإعداد

جميلة ابو ربيع

الاقتباسات الببليوغرافية