Multiblock Copoly(urethane–imide)s with the Properties of Thermoplastic Elastomers

Диденко, А. Л.; Kuznetsov, Denis A.; Vaganov, G. V.; Smirnova, V. E.; Попова, Е. Н.; Иванов, А. Г.; Svetlichnyi, V. M.; Yudin, V. E.; Kudryavtsev, V. V.

doi:10.1134/s1811238220020046

Cited by 13 publications

(9 citation statements)

References 15 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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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

et al. 2022

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“…The CPUI synthesis was carried out at the intermediate stage of the creation of macromonomers with terminal anhydride groups [17]. These polymer systems were analyzed by the methods of thermogravimetry, differential scanning calorimetry, dynamic mechanical analysis, and melt rheology.…”

Section: Preamblementioning

confidence: 99%

The Co-Poly(Urethane-Imide) Heat Resistant Thermoplastic Elastomers

Диденко

Kuznetcov

Smirnova

et al. 2022

NHC

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Co-Pоly (Urethane-Imide) s (CPUI) based on pоly (diethyleneglycol) adipate diol, tolylenediisocyanate, multinucleate dianhydrides and diamines were synthesized. The films and moldings from CPUI were processed and their mechanical characteristics were evaluated. Distinctions of specifications of the films formed from polymer solutions and the moldings formed from melt polymers are indicated when using the same starting CPUI. It appears that films and moldings possess typical properties of elastomers. The reprocessing of studied copolymers by using the injection molding method allows to assign CPUI to the thermoplastic elastomers or so-called thermoelastoplasts.

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“…As the imide content (HS content) increases, the glass transition temperature (T g ), rubber plateau temperature, thermal decomposition temperature, and modulus of PUI also increase. 17,18 This phenomenon has a direct effect on material flexibility, indicating the importance of ensuring an appropriate amount of HS content. During the adjustment of HS content, increasing the number of flexible chain segments with O or S structures or introducing a crankshaft configuration can improve the material's processability and its solubility in common solvents.…”

Section: Introductionmentioning

confidence: 99%

“…According to these studies, incorporating an imide structure into PU results in microphase separation. As the imide content (HS content) increases, the glass transition temperature ( T g ), rubber plateau temperature, thermal decomposition temperature, and modulus of PUI also increase 17,18 . This phenomenon has a direct effect on material flexibility, indicating the importance of ensuring an appropriate amount of HS content.…”

Section: Introductionmentioning

confidence: 99%

Casting poly(urethane‐imide) elastomers with improved thermoviscoelasticity

Lin,

Lou,

Cheng

et al. 2023

J of Applied Polymer Sci

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Polyurethane (PU) is a versatile material that can be customized to meet specific commercial requirements in different industries because of its favorable mechanical properties. However, it is not resistant to high temperatures, and it requires structural modifications before it can be used in high‐temperature structural materials. In this study, isocyanates and anhydrides are copolymerized at high temperatures to obtain a solvent‐free oligomer, thus eliminating the risks associated with highly polar aprotic solvents. A casting technique is used to synthesize a solid poly(urethane‐imide) (PUI) elastomer. According to the results, casting PUI (CPUI) exhibits optimal physical properties at a hard segment content of 30.5%. Incorporating an ether, symmetric, or imide structure into CPUI may reduce its hysteresis and improve its thermal creep performance. Compared with PU, CPUI exhibits considerably higher creep aging resistance. In dynamic load application tests, CPUI wheels take a substantially longer time to reach failure compared with PU wheels. Overall, CPUI is an environmentally friendly material with high elasticity, low creep, and high heat aging resistance and is suitable for static and dynamic manufacturing applications.

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Multiblock Copoly(urethane–imide)s with the Properties of Thermoplastic Elastomers

Cited by 13 publications

References 15 publications

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

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

The Co-Poly(Urethane-Imide) Heat Resistant Thermoplastic Elastomers

Casting poly(urethane‐imide) elastomers with improved thermoviscoelasticity

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