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Keywords = copolyheteroarylene

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17 pages, 2454 KB  
Article
Asymmetric Membranes Based on Copolyheteroarylenes with Imide, Biquinoline, and Oxazinone Units: Formation and Characterization
by Galina Polotskaya, Alexandra Pulyalina, Mikhail Goikhman, Irina Podeshvo, Iosif Gofman, Sergey Shugurov, Valeriia Rostovtseva, Ilya Faykov, Maksim Tataurov, Alexander Toikka and Alexander Polotsky
Polymers 2019, 11(10), 1542; https://doi.org/10.3390/polym11101542 - 22 Sep 2019
Cited by 9 | Viewed by 3277
Abstract
Modern ultrafiltration requires novel perfect membranes with narrow pore size, high porosity, and minimal pore tortuosity to achieve high separation performance. In this work, copolyamic acid (co-PAA) was synthesized and used for the preparation of asymmetric porous membranes by phase inversion technique. Several [...] Read more.
Modern ultrafiltration requires novel perfect membranes with narrow pore size, high porosity, and minimal pore tortuosity to achieve high separation performance. In this work, copolyamic acid (co-PAA) was synthesized and used for the preparation of asymmetric porous membranes by phase inversion technique. Several co-PAA membranes were heated up to 250 °C; during heating, they undergo solid-phase transformation into co-polybenzoxazinoneimide (co-PBOI) via dehydration and cyclization. Comparative characterization of both co-PAA and co-PBOI membranes was realized by scanning electron microscopy, mechanical testing, thermogravimetric analysis, and ultrafiltration experiments. Membrane calibration was carried out using a mixture of seven proteins with different molecular weights. During heat treatment, the molecular weight cut-off of the membranes decreased from 20 × 103 g/mol (co-PAA) to 3 × 103 g/mol (co-PBOI). Abnormally low dispersions of rejection (0.3 for co-PAA and 0.45 for co-PBOI) were observed for the studied membranes; this fact indicates that the membranes possess enhanced resolving power. Full article
(This article belongs to the Special Issue Polymeric Membrane Materials for Separation Liquid and Gas Mixtures)
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