A synthetic variety of chukhrovite

Sokolova, N G; Konovalova, S. L.

doi:10.1080/00206818209451017

Cited by 3 publications

(3 citation statements)

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“…Thus, the existence of relaxation transitions is related to the heterogeneous elastomer structure due to the presence of supramolecular entities [6][7][8][11][12][13]. Their positions on the temperature scale and the effective activation energy in portions of the curves before and after the relaxation transition are different for different rubbers with the same content of AN units and even with similar contents of trans-1,4 isomers of butadiene ( Table 2).…”

Section: Resultsmentioning

confidence: 99%

The Structure of Acrylonitrile-Butadiene Rubbers: Paramagnetic-Probe Study

Livanova

Карпова²,

Заиков³

2013

ChChT

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Chain microstructures and supramolecular structures of nitrile-butadiene rubbers are studied by ESR spectroscopy. On the temperature dependences of the rotational mobility (correlation time τ c) of paramagnetic probe 2,2,6,6-tetramethylpiperidine-1-oxyl, relaxation transitions are observed. It is shown that there is a correlation between the Arrhenius parameters of rotational mobility of radical and the copolymer composition and that different brands of rubbers differ in microstructure and supramolecular structure.

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Section: Resultsmentioning

confidence: 99%

The Structure of Acrylonitrile-Butadiene Rubbers: Paramagnetic-Probe Study

Livanova

Карпова²,

Заиков³

2013

ChChT

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“…The total amorphization attests to a random distribution of trans-1,4-units. Hence, at a high content of acrylonitrile units, BNKS-40 contains the greatest amounts of structures formed by both strong dipole−dipole bonds between nitrile groups and trans-1,4butadiene sequences [7,12,22].…”

Section: Resultsmentioning

confidence: 99%

The Structure of Polybutadienes and Butadiene-Acrylonitrile Copolymers

Livanova¹,

Карпова²

2011

ChChT

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The paramagnetic probe method with the use of free radicals of different dimensions (2,2,6,6-tetramethyl-1-piperidinyloxy and 4-benzoate-2,2,6,6-tetramethyl-1piperidinyloxy) has been employed to study the effect of the isomeric composition of butadiene units in polybutadienes and butadiene-acrylonitrile copolymers on the number and dimensions of ordered structures. The nature of density fluctuations and defective regions, that is, the regions in which the radicals are sorbed, has been ascertained. It has been shown that the ordered regions are composed of stereoregular chain fragments, while defective regions are enriched with butadiene isomers different from those present in prevailing amounts.

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“…Some investigators [1][2][3][4] reported that these crystals occur within the whole range of concentration, but others [5][6][7][8] found a point of discontinuity of peritonic type. The X-ray diffraction patterns [9] of the equilibrium solid phases also suggest the existence of a region of breaking continuity.…”

Section: Introductionmentioning

confidence: 99%

Enthalpies of crystallization of equilibrium solid phases occurring in the system K2SO4-(NH4)2SO4-H2O at 298.15 K

Chmarzyński

1992

Journal of Thermal Analysis

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The concentration dependences of the differential enthalpies of solution were measured along several crystallization paths in the above-mentioned system, and the enthalpies of crystallization of mixed crystals occurring as a stable solid phase in the system were calculated on this basis. The obtained results confirmed the existence of a region of breaking continuity in the equilibrium solid phases.

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A synthetic variety of chukhrovite

Cited by 3 publications

References 0 publications

The Structure of Acrylonitrile-Butadiene Rubbers: Paramagnetic-Probe Study

The Structure of Acrylonitrile-Butadiene Rubbers: Paramagnetic-Probe Study

The Structure of Polybutadienes and Butadiene-Acrylonitrile Copolymers

Enthalpies of crystallization of equilibrium solid phases occurring in the system K2SO4-(NH4)2SO4-H2O at 298.15 K

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