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Spirina T.N.,RAS Institute of Macromolecular Compounds | Saprykina N.N.,RAS Institute of Macromolecular Compounds | Andreeva O.A.,RAS Institute of Macromolecular Compounds | Kulikova E.M.,RAS Institute of Macromolecular Compounds | And 3 more authors.
Russian Journal of Applied Chemistry | Year: 2012

The morphology of hydrolysis lignin was studied. The effect of dimethyl sulfoxide, temperature, and activating additives on the surface characteristics of lignin was examined. © 2012 Pleiades Publishing, Ltd. Source


Evstigneev E.I.,St Petersburg State Academy Of Forestry Engineering
Russian Journal of Applied Chemistry | Year: 2010

The solubility of lignin in aqueous NaOH solutions and dioxane-water mixtures was studied. Factors governing the solubility of lignin in these media were determined. © 2010 Pleiades Publishing, Ltd. Source


Martynova A.I.,St Petersburg State Academy Of Forestry Engineering | Orlov V.V.,Saint Petersburg State University
Astronomy Reports | Year: 2011

Numerical simulations of near-resonant motions occurring in planar rotating systems of three bodies with equal masses are presented for the cases of prograde and retrograde motions of the inner and outer pairs. The ratios n: m of the initial periods of these pairs are within 1 ≤ m ≤ n ≤ 7. It is shown that, as a rule, retrograde are more stable than prograde motions. The k loop structures oriented inwards for prograde and outwards for retrograde motions are revealed. Empirical relations between k and n are found for the main resonances n: 1 and n: 2. © 2011 Pleiades Publishing, Ltd. Source


Evstigneev E.I.,St Petersburg State Academy Of Forestry Engineering
Russian Journal of Applied Chemistry | Year: 2011

The solubility of lignin in aqueous NaOH solutions was studied in relation to the lignin molecular weight, temperature, liquid to solid ratio, and ionic strength. A new procedure for determining the content of phenolic hydroxyls in lignin was developed. A formula was suggested for calculating the lignin solubility in aqueous alkali solutions. © 2011 Pleiades Publishing, Ltd. Source


Sazanov Y.N.,RAS Institute of Macromolecular Compounds | Popova E.N.,RAS Institute of Macromolecular Compounds | Sumerskii I.V.,St Petersburg State Academy Of Forestry Engineering | Mokeev M.V.,RAS Institute of Macromolecular Compounds | And 5 more authors.
Russian Journal of Applied Chemistry | Year: 2010

Conclusions on the reactivity of lignin in thermal processes are made on the basis of published data and results of thermal analysis of lignin samples from certain hydrolysis enterprises. © 2010 Pleiades Publishing, Ltd. Source

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