Structural effects in matrix polycondensation of silicic acid

Papisov, I. M.; Bolyachevskaya, K.I.; Litmanovich, A. A.; Matveenko, V. N.; Volchkova, I. L.

doi:10.1016/s0014-3057(99)00003-8

Cited by 15 publications

(8 citation statements)

References 4 publications

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“…Silicates solubility (particularly those of lower silica/alkali ratio) justifies the quoted behavior since panels were aged previously in the HTCC [14,15]. Partial lixiviation of the soluble silicates was verified determining the retention and penetration values; although the first ones diminished as maximum 10% in panels for LOI test and 6% for those used in two-foot tunnel, the distribution in depth observed by microscopy indicated a very reduced presence on the surface (up to 1 mm, according to the impregnant-material type) and a growing profile toward the interior (starting from 2 or 3 mm, a similar homogeneous retention to the existent in the core of the sample was detected).…”

Section: Group Bmentioning

confidence: 70%

Fire Resistance of Wood Impregnated with Soluble Alkaline Silicates

Giúdice

Pereyra

2007

Research Letters in Materials Science

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The aim of this paper is to determine the fire performance of wood panels (Araucaria angustifolia) impregnated with soluble alkaline silicates. Commercial silicates based on sodium and potassium with 2.5/1.0 and 3.0/1.0 silica/alkali molar ratios were selected; solutions and glasses were previously characterized. Experimental panels were tested in a limiting oxygen chamber and in a twofoot tunnel. Results displayed a high fire-retardant efficiency using some soluble silicates.

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Section: Group Bmentioning

confidence: 70%

Fire Resistance of Wood Impregnated with Soluble Alkaline Silicates

Giúdice

Pereyra

2007

Research Letters in Materials Science

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“…The solubility of the studied alkaline silicates (particularly those of lower silica/alkali ratio) justifies the quoted behavior as the testing panels were previously immersed for 7 days in distilled water [20,21]. A partial releasing of the soluble silicates was verified determining the retention and penetration values of the impregnant material; although the first ones diminished as maximum 7% in the panels for the LOI test and 3% for those used in Two Foot Tunnel test, the distribution in depth observed by microscopy indicated a very reduced presence on the surface (up to 0.5 mm, according to the impregnant material type) and a growing profile toward the interior (starting from 1 or 2 mm a similar homogeneous retention existent in the core of the sample was detected).…”

Section: Seriesmentioning

confidence: 72%

Silica nanoparticles in high silica/alkali molar ratio solutions as fire‐retardant impregnants for woods

Giúdice

Pereyra

2009

Fire and Materials

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SUMMARYThe objective of this paper is to know the fire performance of wooden panels (Pinus radiata) impregnated with silica nanoparticles added to silica/alkali colloidal solutions. Two series of impregnated panels were prepared with diverse penetrations and retentions (a) after drying/curing the impregnants at laboratory conditions until reaching constant weight and (b) after finishing this stage with prior distiller water immersion for seven days and a later air exposition for attaining moisture balance. Panels were tested in a limiting oxygen chamber and in a two-foot tunnel. Some results displayed a high fire-retardant efficiency.

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“…The combination of the properties of a polymeric matrix and silica makes them attractive as barrier, optical, constructional, and other materials. The methods available for the preparation of the polymer–silica nanocomposites are based on the incorporation of nanoparticles of natural foliated or synthetic silica into a matrix by mixing them with a polymer melt or solution, the successive synthesis of a polymer or silica, or their simultaneous synthesis, with silica being obtained by the sol–gel method. In addition, there are some exotic approaches, such as silica precipitation in polymer plasma …”

Section: Introductionmentioning

confidence: 99%

Polyethylene–Silica Nanocomposites with the Structure of Semi‐Interpenetrating Networks

Трофимчук

Meshkov

Kandlina

et al. 2019

Macro Materials & Eng

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Organic–inorganic nanocomposites with the structure of interpenetrating or semi‐interpenetrating networks are considered as advanced materials, since they have improved thermal and mechanical properties. An alternative approach to the preparation of such hybrid systems is proposed. It is based on the synthesis of silica from the precursor of hyperbranched polyethoxysiloxane by the hydrolytic condensation reaction in the volume of pores of a polymer matrix (bulk porosity is 40 vol%) stretched via the environmental crazing mechanism. Polyethylene–silica nanocomposites with the structure of semi‐interpenetrating networks when the content of silica is not less than 20–25 wt% are obtained. These composites can undergo an additional phase separation at a temperature of 160 °C (above the melting point of polyethylene), which is accompanied by an increase in the size of the polymer phase with the formation of macrophases. At the same time, the environment (orthophosphoric acid), in which the composite is heated, fills the pores that have appeared. As a result, the content of the third component with the new functionality increases up to 50 wt%, which allowed us to impart proton‐conducting properties to the composite material and preserve its shape stability.

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Structural effects in matrix polycondensation of silicic acid

Cited by 15 publications

References 4 publications

Fire Resistance of Wood Impregnated with Soluble Alkaline Silicates

Fire Resistance of Wood Impregnated with Soluble Alkaline Silicates

Silica nanoparticles in high silica/alkali molar ratio solutions as fire‐retardant impregnants for woods

Polyethylene–Silica Nanocomposites with the Structure of Semi‐Interpenetrating Networks

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