Synthesis, Heat Resistance, and Mechanical Properties of Cross-Linked Urethane–Imide Copolymers Containing Blocks of Two Structurally Different Aliphatic Fragments (Polyether and Polyester) in the Backbone

Диденко, А. Л.; Иванов, А. Г.; Богданова, Е. А.; Smirnova, V. E.; Vaganov, G. V.; Попова, Е. Н.; Kuznetsov, Denis A.; Kobykhno, Ilya; Vasil’eva, E. S.; Толочко, О. В.; Svetlichnyi, V. M.; Yudin, V. E.; Kudryavtsev, V. V.

doi:10.1134/s107042722109007x

Cited by 10 publications

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“…The copoly(urethane-imide) chosen as the object of study was obtained according to the synthesis method outlined in our initial studies [ 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. At that, pyromellitic anhydride with a melting point (T m )~283–286 °C, Sigma-Aldrich Co., LLC, Burlington, MA, USA; polycaprolactone with molecular weight Mn = 2000, Sigma-Aldrich Co. LLC with melting point (T m )~50 °C; 2,4- toluene diisocyanate with melting point (T m )~20–22 °C, Sigma-Aldrich Co., LLC; 4,4′-diaminodiphenyl ether with melting point (T m )~188–192 °C, Sigma-Aldrich Co., LLC.…”

Section: Methodsmentioning

confidence: 99%

“…As a comparison object, a multiblock (segmental) copoly(urethane-imide) ( Scheme 2 ) which contained one aromatic and one aliphatic block in a repeating link was synthesized. Synthesis of multiblock copoly (urethane-imide) was carried out under working conditions [ 39 , 40 , 41 , 42 ]. The molar ratio of the initial monomers of pyromethyl anhydride, diamine and caprolactone was 2:1:1.…”

Section: Methodsmentioning

confidence: 99%

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Selective Destruction of Soluble Polyurethaneimide as Novel Approach for Fabrication of Insoluble Polyimide Films

et al. 2022

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Polymeric coatings and membranes with extended stability toward a wide range of organic solvents are practical for application in harsh environments; on the other hand, such stability makes their processing quite difficult. In this work, we propose a novel method for the fabrication of films based on non-soluble polymers. The film is made from the solution of block copolymer containing both soluble and insoluble blocks followed by selective decomposition of soluble blocks. To prove this concept, we synthesized copolymer [(imide)n-(polyurethane)]m, in which the imide blocks were combined with polyurethane blocks based on polycaprolactone. By selective hydrolysis of urethane blocks in the presence of acid, it was possible to obtain the insoluble polyimide film for the first time. It was shown that the combination of thermal and acid treatment allowed almost complete removal of urethane blocks from the initial copolymer chains. IR spectroscopy, TGA, DSC and DMA methods were used to study the evaluation of the structure and properties of polymeric material as a result of thermal oxidation and hydrolysis by acid. It was shown that the polymeric films obtained by controlled decomposition were not soluble in aprotic solvent, such as dimethylformamide, n-methylpyrrolidone and dimethyl sulfoxide, and showed very close similarity to the homopolymer consisting of the same imide monomer, poly-(4,4′oxydiphenylene)pyromellitimide, confirming the feasibility of the proposed concept and its perspectives for fabrication of organic solvent-resistant membranes.

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