Mechanism of intumescence of a polyethylene/calcium carbonate/stearic acid system

被引：35

作者：

Bellayer, S. ^{[1
]}

Tavard, E. ^{[2
]}

Duquesne, S. ^{[1
]}

Piechaczyk, A. ^{[2
]}

Bourbigot, S. ^{[1
]}

机构：

[1] ENSCL, CNRS, UMR Procedes Elaborat Revetements Fonct 8008, F-59652 Villeneuve Dascq, France

[2] Nexans Res Ctr, F-69353 Lyon 07, France

来源：

POLYMER DEGRADATION AND STABILITY | 2009年 / 94卷 / 05期

关键词：

Polyethylene; Carbonate; Intumescence; Flame retardant; ETHYLENE-ACRYLATE COPOLYMER; FLAME-RETARDANT PROPERTIES; SILICONE ELASTOMER; FLAMMABILITY; BEHAVIOR; CHALK;

D O I：

10.1016/j.polymdegradstab.2009.01.032

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

In this work, we have investigated the intumescent behaviour of linear low-density polyethylene (LLDPE) containing calcium carbonate (chalk) treated by stearic acid. This system swells during burning and creates a protective layer when exposed to an external heat flux of 50 kW/m(2) in a mass loss calorimeter. This system has been fully characterized by FTIR, XRD, TGA and SEM. The carbonation/decarbonation temperatures, the swelling phenomenon and the effect of the thermal stress on the swelling have been examined. The residue is composed of a smooth surface made of chalk and CaO and a bulk of only chalk. Stearic acid allows a good dispersion of chalk particles into the LLDPE matrix, and contributes to form a cohesive network during burning when the thermal stress is high enough. A governing parameter of the intumescent effect is the particle size, which permits the formation of an insulating and cohesive mineral network during burning. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：797 / 803

页数：7

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