Aspectos do comportamento de polímeros em condições de incêndio

Gallo, Jorge B.; Agnelli, José Augusto Marcondes

doi:10.1590/s0104-14281998000100005

Cited by 24 publications

(26 citation statements)

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“…The basic physical and chemical aspects of gas-phase ignition reactions have been studied by several researchers [7,8,22] . Thus, the introduction of flame retardants is required in those situations [7,8,16,23] . Flame retardants are intended to inhibit or stop the polymer combustion process.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on their nature, they can act physically (by cooling, forming a dilution layer or fuel protection) or chemically (gas or condensed phase reaction). They can interfere with different processes involved in the polymer combustion (heating, pyrolysis, ignition, and propagation of thermal degradation) [13,16,23] .…”

Section: Introductionmentioning

confidence: 99%

“…There is a large number of flame-retardant additives, which are divided into halogenated and non-halogenated compounds [3,13,16,[23][24][25][26][27][28] . The halogenated flame retardants are more efficient than the non-halogenated composites, although they are more toxic during the burning process [23,26,27] .…”

Section: Introductionmentioning

confidence: 99%

“…The halogenated flame retardants are more efficient than the non-halogenated composites, although they are more toxic during the burning process [23,26,27] .…”

Section: Introductionmentioning

confidence: 99%

“…When they decompose, they interfere with the combustion process, both in the gaseous combustion and in the condensed phase. However, fluorine-and iodine-based retardants are not commonly used because none of them interferes with the exact point of ignition of the combustion process [22,23,25,26] .…”

Section: Introductionmentioning

confidence: 99%

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Investigating the influence of conduit residues on polyurethane plates

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The halogenated flame retardants are more efficient than the non-halogenated composites, although they are more toxic during the burning process [23,26,27] .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigating the influence of conduit residues on polyurethane plates

et al. 2017

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Vinyl ester resin modified with silicone‐based additives: II. Flammability properties

Mazali

Felisberti

2005

J of Applied Polymer Sci

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Silicone-based additives have been used as fire retardants for thermoplastics, presenting the advantages of improving processing and impact resistance of the polymers. In this work we used three different silicone-based additives as modifiers of a thermoset based on a vinyl ester resin. The additives are fine powders made up of about 50 wt % ultra high molecular weight polydimethylsiloxane and 50 wt % silica. The differences between them are the functional groups inserted on the additives and the size and size distribution of the particles. The additives were dispersed in resin containing 35 wt % of styrene. For curing the mixture a conventional catalyst and initiator were used and the reaction was carried out in two ways, differing in the curing temperature, the post curing temperature, and the time, and in the addition of dimethylaniline (DMA) as a promoter of the polyaddition reaction. The samples were characterized by thermogravimetric analyses and swelling experiments. The fire retardances of the samples were evaluated by the determination of the flash-ignition, self-ignition, and pyrolysis temperatures (ASTM D1919 -91a), and of the oxygen index (ASTM D-2863-91). The results obtained showed that the silicone-based additives and the methods used in the preparation of the modified resin influence the flash-ignition, self-ignition, and pyrolysis temperatures, but not the oxygen index. Samples cured by different methods present different network characteristics, which influence their thermal decomposition. The volatile species produced by thermal decomposition may be a combination of inert and active species. The network structure may influence only the inert fraction of the volatiles, not the combustibles. These volatile inert species (smoke-black, water vapor, carbon dioxide, etc.) probably dilute the combustibles in the solid and in the gaseous phase, increasing the flash-ignition temperature of the samples.

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Enhancement of fire retardancy properties of glass fibre–reinforced polyesters composites

et al. 2019

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Summary This paper presents the results of an experimental investigation on the fire retardancy properties of glass fibre–reinforced polyester (GFRP) composites with bisphenol‐A vinylester and isophthalic polyester as matrices and low electrical conductivity E‐glass fibres as reinforcement. The fire protection systems tested were alumina trihydrate (ATH), decabromodiphenyl ether (DBDE), and antimony trioxide (Sb2O3). A mass loss cone calorimeter was used to obtain the properties of heat release rate (HRR), peak HRR, total heat released, total mass loss, time to ignition, and time of combustion. Moreover, limiting oxygen index (LOI), UL‐94, and glow‐wire tests were also performed. The fire tests were carried out in order to investigate if the combination of ATH and DBDE could have “additive,” “antagonistic,” or “synergistic” effects on the flame retardant properties of the GFRP studied in this work. In addition, the influence of the ATH content variation on flame retardant properties was also evaluated. The results indicate that the sole addition of ATH at 47.7 phr could lead to the complete inhibition of the composites ignition, while the materials containing DBDE exhibit ignition and flame propagation in the cone calorimeter test.

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Aspectos do comportamento de polímeros em condições de incêndio

Cited by 24 publications

References 1 publication

Investigating the influence of conduit residues on polyurethane plates

Investigating the influence of conduit residues on polyurethane plates

Vinyl ester resin modified with silicone‐based additives: II. Flammability properties

Enhancement of fire retardancy properties of glass fibre–reinforced polyesters composites

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