Morphological Analysis of Poly(4,4'-oxydiphenylene-pyromellitimide)-Based Organic Solvent Nanofiltration Membranes Formed by the Solution Method

Morphological Analysis of Poly(4,4'-oxydiphenylene-pyromellitimide)-Based Organic Solvent Nanofiltration Membranes Formed by the Solution Method

Poly-(4,4'-oxydiphenylene) pyromellitimide or Kapton is the most widely available polyimide with high chemical and thermal stability. It has great prospects for use as a membrane material for filtering organic media due to its complete insolubility. However, the formation of membranes based on...

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Bibliographic Details
Published in:Membranes (Basel) Vol. 12; no. 12; p. 1235
Main Authors: Sukhanova, Tatyana E, Didenko, Andrey L, Borisov, Ilya L, Anokhina, Tatyana S, Ivanov, Aleksey G, Nesterova, Anna S, Kobykhno, Ilya A, Yushkin, Alexey A, Kudryavtsev, Vladimir V, Volkov, Alexey V
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 07-12-2022
MDPI
Subjects:
copoly(urethane-imide)s
Ethyl carbamate
Hydrochloric acid
Hydrolysis
Imides
Investigations
Kapton (trademark)
membrane
Membranes
Methods
Morphology
multiblock (segmented) copolymers
Nanofiltration
Nanotechnology
Nylon 6
Optimization
organic solvent nanofiltration
poly(4,4′-oxydiphenylene–pyromellitimide)
Polyimide resins
Polymer films
Polymers
Pore size
Solvents
Thermal stability
Topography
Ultrafiltration
Urethanes
Viscosity
Russia
Bulgaria
Switzerland
membrane
copoly(urethane-imide)s
morphology
poly(4,4′-oxydiphenylene–pyromellitimide)
solution method
organic solvent nanofiltration
multiblock (segmented) copolymers
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Summary:Poly-(4,4'-oxydiphenylene) pyromellitimide or Kapton is the most widely available polyimide with high chemical and thermal stability. It has great prospects for use as a membrane material for filtering organic media due to its complete insolubility. However, the formation of membranes based on it, at the moment, is an unsolved problem. The study corresponds to the rediscovery of poly(4,4'-oxydiphenylene-pyromellitimide)-based soluble copoly(urethane-imides) as membrane polymers of a new generation. It is shown that the physical structure of PUI films prepared by the solution method becomes porous after the removal of urethane blocks from the polymer, and the pore size varies depending on the conditions of thermolysis and subsequent hydrolysis of the membrane polymer. The film annealed at 170 °C with a low destruction degree of polycaprolactam blocks exhibits the properties of a nanofiltration membrane. It is stable in the aprotic solvent DMF and has a Remasol Brilliant Blue R retention coefficient of 95%. After the hydrolysis of thermally treated films in acidic media, ultrafiltration size 66-82 nm pores appear, which leads to an increase in the permeate flow by more than two orders of magnitude. This circumstance provides opportunities for controlling the membrane polymer structure for further optimization of the performance characteristics of filtration membranes based on it. Thus, we proposed a new preparation method of ultra- and nanofiltration membranes based on poly(4,4'-oxydiphenylene-pyromellitimide) that are stable in aprotic solvents.
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ISSN:2077-0375
2077-0375
DOI:10.3390/membranes12121235