Structure and morphology of an intumescent polypropylene blend

Almeras, X.; Renaut, Nicolas; Jama, Charafeddine; Bras, Michel Le; Tóth, A.; Bourbigot, Serge; Marosi, Gy.; Poutch, Franck

doi:10.1002/app.20470

Cited by 25 publications

(17 citation statements)

References 41 publications

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“…While migration is also driven by the interfacial tension between additive and matrix, the use of a compatibilizer can reduce its rate. Almeras et al have observed that EVA (with 24 wt% of vinyl acetate) prevents the exudation of APP during processing in PP/PA6/APP blends . Nevertheless, in another study, the same group noted that EVA fails to prevent APP exudation during weathering (as already discussed above).…”

Section: How To Limit the Influence Of Ageing On Flame Retardancymentioning

confidence: 87%

Effects of ageing on the fire behaviour of flame-retarded polymers: a review

2014

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International audienceThe influence of environmental ageing on the reaction to fire of flame-retarded polymers is reviewed. Six types of stimuli have been identified as the most relevant parameters inducing fire behaviour modification: temperature, moisture, UV radiation, ionizing radiation, chemical solvent and physical stress. This review provides a state of the art and current comprehension of the effects of ageing on flame retardancy of polymers. Various physical and chemical phenomena lead to ageing and deterioration (or sometimes improvement) of the flame retardancy of polymers: release of additives (not only flame retardants) through thermal migration, solubilization, abrasion, etc., chemical degradation of the flame-retardant system, and chemical or physical modification of the polymer structure (chain scission, crosslinking, diffusion of water, etc.). Obviously, ageing effects strongly depend on the material and the ageing scenario considered. Solutions to maintain flame-retardant efficiency in aggressive conditions are also presented

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Section: How To Limit the Influence Of Ageing On Flame Retardancymentioning

confidence: 87%

Effects of ageing on the fire behaviour of flame-retarded polymers: a review

2014

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“…Dipentaerythritol (DPER) and tripentaerythritol (TPER) with lower water‐solubility but higher price were used as a charring agent in intumescent systems,13 but the migration and thermal instability problems still remained. On the other hand, some macromolecular charring agents such as polyamide (PA) and TPU were adopted 14–17. Bugajny et al16,17 found that TPU as a char‐forming polymer possessed better stability in the PP/APP/TPU intumescent system, but, unfortunately, poorer flame retardancy than using PER as the charring agent in this system.…”

Section: Introductionmentioning

confidence: 99%

Flame‐Retarded Poly(propylene) with Melamine Phosphate and Pentaerythritol/Polyurethane Composite Charring Agent

Liu

Wang

2007

Macro Materials & Eng

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In this paper, a novel intumescent system including MP as well as PER/TPU which acts as composite charring agent, is adopted to flame‐retarded PP. The encapsulation of charring agent PER by TPU effectively avoids the reaction of PER with MP during the compounding with PP at high temperature and also prevents the leaching out of polar PER from nonpolar PP matrix, thus remarkably enhancing the stability and water‐resistance of the intumescent system. PER and TPU have different but complementary charring mechanisms. So flame‐retarded PP with MP/composite charring agent shows a much better charring performance and flame‐retardancy than MP/PER flame‐retarded PP. The experimental results show that the former can reach UL‐94 V‐0 rating at 1.6 mm thickness at 25 wt.‐% flame retardant loading.magnified image

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“…[9,10] Furthermore, studies have focused on intumescent flame retardancy for polyolefins by using charring polymers such as PA6 as the carbonization agent. [11][12][13][14][15][16] In this work, we investigated the intumescent flame retardant system of ABS/PA6/SMA alloys with APP in which APP acted as an acid source and a blowing agent and PA6 as a carbon source. Furthermore, we employed various synergistic charring agents to investigate the synergistic effect of charring agents on the flame retardancy of ABS/PA6/SMA blends.…”

Section: Introductionmentioning

confidence: 99%