Formation of strong ceramified ash from silicone-based compositions

Mansouri, Jaleh; Burford, R. P.; Cheng, Yi‐Bing; Hanu, Laura Georgeta

doi:10.1007/s10853-005-1427-8

Cited by 75 publications

(50 citation statements)

References 14 publications

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“…The eutectic liquid penetrates the structure of composite, acting as a bridge between silica and filler to form a coherent structure at the fire temperature. As shown, the properties of eutectic phase depend on both particle size and chemical composition of fillers incorporated into the SR [31]. The formation of the eutectic phase-bonding mineral fillers with silica proceeds at a temperature above 800°C.…”

Section: Flammability Of Silicone Rubber Compositesmentioning

confidence: 95%

Effect of cenospheric fillers on the flammability and fire hazard of silicone rubber composites

Rybiński

Żukowski

Bradło

2016

J Therm Anal Calorim

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This paper presents the results of testing the flammability of silicone rubber composites containing fillers, such as cenospheres, cenospheres covered with iron, attapulgite, wollastonite, aluminum hydroxide and silica. In order to increase the insulating character of boundary layer, boron trioxide was incorporated into the composites of silicone rubber as a ceramization additive. The flammability of the composites was tested with the use of a cone calorimeter. The composition of the gaseous products of thermal decomposition was determined quantitatively and qualitatively in the system with intensive stirring in the fluidal bed, under isothermal conditions at temperatures T = 550, 650 and 750°C. All the test results show that the fillers used, especially with ceramization additives considerably reduce the fire hazard of silicone rubber composites containing these fillers.

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Section: Flammability Of Silicone Rubber Compositesmentioning

confidence: 95%

Effect of cenospheric fillers on the flammability and fire hazard of silicone rubber composites

Rybiński

Żukowski

Bradło

2016

J Therm Anal Calorim

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“…Ceramization effect is based on sticking mineral particles dispersed in polymer matrix together in different processes, generally in the presence of fluxing agent [1][2][3][4][5][6][7][8]. Even without the addition of inorganic filler of relatively low softening point temperature (fluxing agent like glass oxide frits), the effect of fire char formation can be observed, but its durability and shape preservation leave much to be desired, especially when ceramization occurs at quite low temperature (550-800°C) [9][10][11][12][13][14][15]. Polymer materials (especially based on fully organic thermoplastics or elastomers) exposed to fire undergo strong thermal degradation and destruction [16][17][18][19][20][21] very often accompanied by the effect of burning drops, which can significantly increase the spread of flames [22].…”

Section: Introductionmentioning

confidence: 99%

“…The composites exposed to flames and elevated temperature create ceramic phase protecting wire and ensure electric integration of the circuit up to 120 min. The family of these materials is still increasing, being the result of more and more research devoted to this issue [1][2][3][4][5][6][7][8][9][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of surface-modified montmorillonites on properties of silicone rubber-based ceramizable composites

Anyszka

Bieliński

Pędzich

et al. 2014

J Therm Anal Calorim

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Ceramizable (ceramifiable) silicone rubberbased composites are modern elastomeric materials for fire protection application. The most important sector of economy using such materials is cable industry because there are special types of electric circuits that have to keep working in the case of fire. These kinds of composites can create ceramic phase protecting copper wire from melting under high temperature. When temperature increases, polymer matrix degrades (creating silica residue as one of the products) and mineral particles dispersed in silicone rubber matrix stick together creating stiff, durable, insulating and porous ceramic skin. In this paper, the influence of surface modification of montmorillonite with quaternary ammonium salts on ceramization of their silicone rubber composites is presented. Filler modification was studied, determining changes to its surface energy and thermal stability. Mechanical properties, flammability and thermal stability of composites were determined. Ceramization of the composites was discussed from the point of view of their mechanical properties and structure of ceramic phase after heat treatment, determined by compression stress tests, porosimetry and scanning electron microscopy adequately. Results show that type of modifier applied strongly affects properties of silicone rubber-based ceramizable composites before and after ceramization. Samples containing surface-modified montmorillonite produce significantly less heat during their thermal decomposition than composite filled with unmodified montmorillonite. Moreover, incorporation of montmorillonite modified with ammonium salt of linear organic chain causes the creation of nano-porous structure after ceramization. On the one hand, it facilitates heat insulation, but on the other hand, high total volume of pores adversely affects mechanical endurance of the ceramic phase.

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“…The silica powder from silicone is of insufficient mechanical strength to maintain a cohesive residue . Figure presents the microstructures of the residue obtained by silicone at different temperatures.…”

Section: Resultsmentioning

confidence: 99%

High strength retention and dimensional stability of silicone/alumina composite panel under fire

et al. 2011

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SUMMARY Compact silicone/alumina composite was obtained by highly filling aluminum oxides and hydroxides in silicone resin. The flexural strength and dimensional change of the silicone/alumina composite after being fired has have been studied. It presented a special fire resistance, which could well coordinate the contradiction between the mechanical strength retention and the dimensional stability of silicone‐based composite in case of catching fire. Thermogravimetric analysis, scanning electron microscopy, X‐ray diffraction, transmission electron microscopy, and electron dispersion spectroscopy were applied to systematically explore the process of the in‐suit organic‐to‐inorganic transformation. A possible mechanism was proposed to illustrate the phenomenon of the high strength retention and dimensional stability of silicone/alumina composite under fire. Copyright © 2011 John Wiley & Sons, Ltd.

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Formation of strong ceramified ash from silicone-based compositions

Cited by 75 publications

References 14 publications

Effect of cenospheric fillers on the flammability and fire hazard of silicone rubber composites

Effect of cenospheric fillers on the flammability and fire hazard of silicone rubber composites

Influence of surface-modified montmorillonites on properties of silicone rubber-based ceramizable composites

High strength retention and dimensional stability of silicone/alumina composite panel under fire

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