TY - JOUR

T1 - Influence of Ionic Liquid on Transport Properties of Hybrid Membranes in the Lactic Acid Dehydration Process

AU - Ростовцева, Валерия Алексеевна

AU - Пулялина, Александра Юрьевна

AU - Дубовенко, Роман Русланович

AU - Сапрыкина, Н.Н.

AU - Виноградова, Людмила Викторовна

AU - Полоцкая, Галина Андреевна

N1 - Publisher Copyright: © 2021, Pleiades Publishing, Ltd.

PY - 2021/9

Y1 - 2021/9

N2 - Abstract: Membranes have been developed for the pervaporative dehydration of lactic acid used for the production of biodegradable polymers: polylactides, polylactic acid, and medical plastics. Membranes were obtained by modifying poly-2,6-dimethyl-1,4-phenylene oxide with small amounts (5 wt %) of a new complex filler containing equal amounts of variegated star macromolecules having six polystyrene arms and six arms of the diblock copolymer poly-2-vinylpyridine-block-poly-tert-butylmethacrylate and the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The structure and physical parameters of the membranes were analyzed using thermogravimetric analysis, differential scanning calorimetry, and scanning electron microscopy, and the density of the membranes was measured by the flotation method. The transport properties of the membranes were investigated in sorption experiments, as well as by pervaporation of a water–lactic acid mixture. It has been shown that the introduction of small amounts of the new modifier into the membrane alters the internal structure of membranes and favorably affects the transport properties of membranes, improving the total permeate flux and increasing the separation efficiency by more than 7 times; the separation factor reaches 2560 in the case of dehydration of lactic acid containing 25 wt % water.

AB - Abstract: Membranes have been developed for the pervaporative dehydration of lactic acid used for the production of biodegradable polymers: polylactides, polylactic acid, and medical plastics. Membranes were obtained by modifying poly-2,6-dimethyl-1,4-phenylene oxide with small amounts (5 wt %) of a new complex filler containing equal amounts of variegated star macromolecules having six polystyrene arms and six arms of the diblock copolymer poly-2-vinylpyridine-block-poly-tert-butylmethacrylate and the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The structure and physical parameters of the membranes were analyzed using thermogravimetric analysis, differential scanning calorimetry, and scanning electron microscopy, and the density of the membranes was measured by the flotation method. The transport properties of the membranes were investigated in sorption experiments, as well as by pervaporation of a water–lactic acid mixture. It has been shown that the introduction of small amounts of the new modifier into the membrane alters the internal structure of membranes and favorably affects the transport properties of membranes, improving the total permeate flux and increasing the separation efficiency by more than 7 times; the separation factor reaches 2560 in the case of dehydration of lactic acid containing 25 wt % water.

KW - ionic liquid

KW - lactic acid

KW - pervaporation

KW - polymer membranes

KW - star-shaped modifier

KW - PERVAPORATION DEHYDRATION

KW - MACROMOLECULES

KW - PURIFICATION

KW - ESTERIFICATION

KW - SEPARATION

UR - http://www.scopus.com/inward/record.url?scp=85117776573&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/d7a0ddc4-7b4c-32df-b402-12e2a68bd874/

U2 - 10.1134/S2517751621050103

DO - 10.1134/S2517751621050103

M3 - Article

VL - 3

SP - 274

EP - 281

JO - Membranes and Membrane Technologies

JF - Membranes and Membrane Technologies

SN - 2517-7516

IS - 5

ER -