Heterogeneous-Heterophase Mechanism Of The Hydrophobic Compound Dissolution In Water

Mikheev, Yu. A.; Guseva, L. N.; Davydov, E. Ya.; Заиков, Г. Е.

doi:10.1163/ej.9789004164109.i-654.46

Cited by 5 publications

(8 citation statements)

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“…All the compounds used are characterized in the literature by a close solubility index ␦ (J/mL) 0.5 : polymers, 19.0; methylene chloride, 19.86; chloroform, 19.0; DBP, 19.8; naphthalene, 20.4. They contained different amounts of spectrally pure additives of two aromatic compounds: the liquid plasticizer dibutylphthalate (DBP, T boil ϭ 340°C) and naphthalene (T boil ϭ 80.2°C).…”

Section: Methodsmentioning

confidence: 99%

Sponge effects in polymers interacting with low‐molecular weight compounds

Mikheev

Guseva

Заиков

2000

J. Appl. Polym. Sci.

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The competition between additives for a place in the polymer matrix are discovered when the blending components ensure the enthalpy of mixing to be nearly zero. The competition of the additives exists as the process of accelerated exudation of one another from glasslike or jellylike films. This is inconsistent with the entropic nature of the mixtures assumed for the homogeneous polymer solutions. The considered effects are beyond the statistical thermodynamics of solutions, and they are explained by the specificity of the chain-sponge organization of a noncrystalline polymer matrix. The equilibrium sorption of volatile compounds by polymer samples is explained by the mechanism of structural entropic solvation and is described by the equation of the micropore volume filling theory.

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Section: Methodsmentioning

confidence: 99%

Sponge effects in polymers interacting with low‐molecular weight compounds

Mikheev

Guseva

Заиков

2000

J. Appl. Polym. Sci.

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“…Equilibrium sorption of these compounds by CTA and PMMA films reaches only several percents, but up to 30% of naphthalene and 90% of DBP are introduced into them from solutions in MC or chloroform. It is characteristic that CTA gels with 90% of DBP are insoluble in the excess of liquid DBP even at T = 100°C [6]. Dependency of the result of mixing on its way of performance does not respond to the statistic thermodynamics and is neglected in determination of the polymer solubility index.…”

Section: Intrastructural Exudationmentioning

confidence: 99%

“…169 Downloaded by [Gazi University] at 15:11 27 December 2014 aggregated chains. Existence of supermolecular carcass is responsible for the failure of homogeneous statistics to explain, for example, the features of cold flow, memory effects and non-Newton flow of melts [2], plasticization anomalies, anti-plasticization and properties of polymer gels [3,4], sorption [5], and the phenomenon of thermodynamic affinity splitting in the single "polymer-nonsolvent liquid" pair [6].…”

Section: Introductionmentioning

confidence: 99%

“…The suggested supposition is probable because crystallite elements are rather stable and are preserved in the melts of polyolefins in a wide temperature range [13]. Elaborating one of the variants of colloid-chemical modeling of the non-crystalline polymer phase, the authors of [9 -121 have limited their considerations to a narrow range of easily crystallizing objects and did not take into account the role of chain-sponge structures [6,8,141. The present review presents the data on the chain sponge responsibility for the processes of interaction with low-molecular compounds which are anomalous from the point of view of the liquid-phase thermodynamics and the theory of rigid sorption centers.…”

Section: Introductionmentioning

confidence: 99%

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Sponge Effects at the Interaction of Polymers with Low-molecular Compounds

Mikheev

Guseva

Заиков

1999

International Journal of Polymeric Materials

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A competition among additives for a place in the polymer matrix under levelling effect of the blending enthalpy was found. The competition apparently contradicts the entropy nature of the mixtures exhibiting accelerated desorption of the added compound from films in a glassy-or jelly-like state. The effects considered cannot be treated by statistical of thermodynamics of solutions and the theory of "the chaos elements in the close order range". They are however, explainable by taking into account the specificity of the chainsponge structure function. The processes of the equilibrium sorption of vaporized compounds by polymers are explained by the mechanism of structural entropic solvation and described by the equation of the micropore volume filling theory.

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“…The mesophase of the polymer substrate is formed by addition of chains that aggregate into domain formations. We believe it possible to base the gel fibre model on the backbone-micellar model of hydrophobic polymers [16,17]. According to this model, the amorphous phase of the gel fibre is included in the system of micellar structures joined by the mesophase backbone (Fig.…”

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confidence: 99%

Experimental study of the structure of polyacrylonitrile gel fibres

2004

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The structure of PAN gel fibres spun by the water-thiocyanate method is investigated. It is shown that in identical spinning conditions, the packing density of the structural elements in gel fibres based on poly(ANco-MA-co-ItA) terpolymer is lower than in gel fibres based on poly(AN-co-MA-co-AMPS). A structural model of PAN gel fibre is proposed and substantiated. It is shown that the lower packing density of the structural elements in PAN gel fibres is responsible for the higher sorption power with respect to different inorganic and organic compounds and higher rate of polymer-analog transformations.The important amount of scientific and technical information accumulated in this area suggests that the structural and mechanical properties of polyacrylonitrile (PAN) fibres used both directly in fabrication of textiles and as precursors for manufacture of carbon and chemisorption fibres are predetermined by the primary structure and molecular-weight characteristics of fibre-forming copolymers and the spinning conditions.The basic industrial methods of fabrication of PAN fibres are different versions of wet spinning based on terpolymers of acrylonitrile (90-93 wt. %) with comonomers containing ester (5-8%) and acid (1-2%) functional groups. The structure of wet spun fibres after washing up to heat treatments (drying, thermofixation, hot drawing) is modeled by oriented gels that include water. The specific surface area (S sp ) of these gel fibres and ordering of their structural elements are determined by the conditions of realization of phase transitions during spinning and plasticization drawing [1].The study of the structural features of gel fibres of the composition poly[acrylonitrile(92.3%)-co-methyl acrylate(6.4%)-co-itaconic acid (1.3%)] spun with the water-dimethylformamide and water-thiocyanate methods in identical conditions of orientation drawing showed that spinning using hydrotropic solvents (for example, 51.5% aqueous solution of NaSCN) produces looser packing of the structural elements of the gel fibres than when aprotic solvents are used [for example, dimethylformamide (DMF)] [2]. The kinetics of fibre formation in manufacture of PAN fibres with the water-thiocyanate (salt) method was investigated previously in [3][4][5]. Diffusion of water into the spinning solution jet takes place at a higher rate than diffusion of NaSCN into the spinning bath. This initially causes slight swelling of the spun gel fibre and then insignificant compaction of its structure (before leaving the spinning bath).The two-phase character of the structure of PAN fibres not treated with heat was hypothesized in [6][7][8]. Heating PAN fibres above the glass transition temperature (T g ) intensifies relaxation processes that lead to transition of amorphous regions in the polymer substrate to a more ordered mesophase.We report the results of a systematic study of the structure of PAN gel fibres based on terpolymers of acrylonitrile (AN), methyl acrylate (MA), and itaconic acid (ItA) or 2-acrylamide-2-methylpropanesulfonic acid (AM...

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Heterogeneous-Heterophase Mechanism Of The Hydrophobic Compound Dissolution In Water

Cited by 5 publications

References 0 publications

Sponge effects in polymers interacting with low‐molecular weight compounds

Sponge effects in polymers interacting with low‐molecular weight compounds

Sponge Effects at the Interaction of Polymers with Low-molecular Compounds

Experimental study of the structure of polyacrylonitrile gel fibres

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