Influence of residual solvent on physical and chemical properties of amorphous glassy polymer films

Kostina, Yu. V.; Бондаренко, Г. Н.; Gringolts, M. L.; Rodionov, A. S.; Rusakova, O. Yu.; Alentiev, A. Yu.; Yakimanskiĭ, A. V.; Bogdanova, Yu. G.; Герасимов, В. К.

doi:10.1002/pi.4554

Cited by 17 publications

(6 citation statements)

References 16 publications

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“…Therefore, specifically for membrane material science, the stability of gas separation properties in time and the effect of preparation technique and operation mode of the polymer membrane (film) on its gas separation characteristics are very important issues [ 1 ]. As a rule, polymer membranes are made out of polymer solutions, thus gas separation properties are sensitive to solvent type and polymer solution concentration [ 2 , 3 , 4 , 5 ], presence of residual solvent, and method of its removal [ 6 , 7 , 8 , 9 ]. Thermodynamic nonequilibrium state of glassy amorphous polymers leads to a change in nonequilibrium free volume and consequently gas separation properties of polymer membranes during exploitation due to physical aging [ 1 , 9 , 10 ] or plasticization with a separated component [ 1 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Previously, in [ 8 , 13 , 14 , 15 , 16 ], it has been shown that interaction between functional groups of polymer with a solvent with formation of hydrogen bonds leads to reorientation of these groups over the polymer backbone, changing its conformational parameters [ 13 , 14 , 15 , 16 ]. If hydrogen bond formation leads to an increase in the quantity of elementary unit conformers of the same geometry, it is appropriate to suppose ordering of conformational composition of elementary units of macromolecule, which results in chain packing ordering.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem Films

et al. 2020

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Changes of the spectral characteristics of absorption bands depending on the films’ treatment method were registered for polyetherimide Ultem films. The possibility of selection of structural criteria (the ratio of the functional groups absorption bands intensities) showing all conformational changes in elementary unit with metrological processing of the results is shown. It is demonstrated that film formation from chloroform solution leads to elementary unit fragments, Ph–O–Ph′, which have an effect on macromolecule conformation and result in increasing of space between fragments of macromolecules (local polymer matrix packing loosening). Desorption of residual chloroform from films by ethanol or supercritical CO2 leads to a change of conformers set in Im–Ph–Im′ units. Quantum chemical modeling showed the possibility of convergence of these fragments in neighboring macromolecules, and consequently of interchain π–π interaction (local densification of chain packing of the polymer matrix). After annealing at a temperature higher than glass transition temperature, the polyetherimide film exhibits the most disordered (amorphous) state at all of the fragments. It is demonstrated that the results, obtained by the combination of theoretical and experimental vibrational spectroscopy methods, are in good agreement with data of chain packing ordering found by analysis of gas separation parameters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of Conformation Order on Gas Separation Properties of Polyetherimide Ultem Films

et al. 2020

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“…One of the rapidly developing directions of poly mer materials science is related to the problem of residual solvent [1][2][3][4][5][6][7][8][9][10][11][12]. For example, for films and membranes based on polyimides, polycarbonates, and Hyflon® fluoro containing polymers solution cast and dried to constant weights at room temper ature in air or in vacuum or for films annealed above the glass transition temperature, the effects of preparation and the thermal treatment conditions on the morphology [1] and gas separating charac teristics of films [2,3,[7][8][9] are explained by the presence of residual solvent.…”

Section: Introductionmentioning

confidence: 99%

Residual water in polyvinyl alcohol

et al. 2014

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The state of sorbed water molecules in the matrix of polyvinyl alcohol is investigated via the meth ods of static sorption, DSC, TGA, IR Fourier spectroscopy, 1 H NMR spectroscopy, and quantum chemical simulation. It is shown that the sorption of water by polyvinyl alcohol characterized by an S shaped isotherm is described by the double sorption model. It is established that the low diffusion coefficients and extremely low rates of desorption processes observed in the range of low activities are determined by a shift of the equi librium toward the formation of hydrogen bonded complexes of water molecules with hydroxy groups of the polymer. A mechanism for the behavior of residual water in hydrophilic polymers is suggested. It implies that differences between polymers are determined only by the quantity of residual water immobilized in "traps" and the energy of hydrogen bond formation.

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“…The behavior of polymer and polymer‐based nanomaterials are experimentally investigated in several of the research papers. The influence of the preparation of samples of amorphous glassy polymers on their physical and chemical properties is studied by analyzing the changes in the structure of the polymer chain as a function of the type of solvent used in the formation of the films . In another paper, the influence of hydrophilic and hydrophobic imidazolium ionic liquids on the curing kinetic, mechanical, morphological and ionic conductivity properties of nitrile rubber composites was studied, and it is proved the addition of such liquids can change the glass transition temperature .…”

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confidence: 99%