Carretera de Madrid A Rivas Jarama
Carretera de Madrid A Rivas Jarama
Liu Y.,Wuhan Textile University |
Liu Y.,IMDEA Madrid Institute for Advanced Studies |
Kong Q.-H.,IMDEA Madrid Institute for Advanced Studies |
Zhao X.-M.,IMDEA Madrid Institute for Advanced Studies |
And 5 more authors.
Polymers for Advanced Technologies | Year: 2017
As-received sepiolite/epoxy systems and Fe3O4-doped sepiolite/epoxy systems were prepared, and the contents of sepiolite and Fe3O4-doped sepiolite were kept as 2 and 4 wt%, respectively. Compared with sepiolite, the effect of Fe3O4-doped sepiolite on the flame retardancy, combustion properties, thermal degradation, thermal degradation kinetics and thermomechanical properties of epoxy resin was investigated systematically by limiting oxygen index (LOI), cone calorimeter (Cone), thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). Some interesting results had been acquired. The addition of sepiolite decreased heat release rate, total smoke production and smoke production rate, and obviously improved LOI values of epoxy composites. Compared with sepiolite, the addition of Fe3O4-doped sepiolite further reduced parameters mentioned above of epoxy composites, and further enhanced LOI values and char residues after cone test. There might be a synergistic effect between sepiolite and Fe3O4 on flame retardant epoxy composite. TGA results indicated that the addition of sepiolite had a slight effect on the thermal degradation of epoxy composites; however, the addition of Fe3O4-doped sepiolite accelerated the thermal degradation of epoxy composites. DMA results showed that the addition of both sepiolite and Fe3O4-doped sepiolite increased the glass transition temperature (Tg) of epoxy composite. The results obtained in this paper supplied an effective solution for developing excellent flame retardant properties of polymeric materials. Copyright © 2015 John Wiley & Sons, Ltd. Copyright © 2015 John Wiley & Sons, Ltd.
Zhang J.,IMDEA Madrid Institute for Advanced Studies |
De Juan S.,IMDEA Madrid Institute for Advanced Studies |
Esteban-Cubillo A.,Carretera de Madrid A Rivas Jarama |
Santaren J.,Carretera de Madrid A Rivas Jarama |
Wang D.-Y.,IMDEA Madrid Institute for Advanced Studies
Chinese Journal of Chemistry | Year: 2015
The objective of the study was to investigate the effect of the organo-modified nanosepiolite (ONSep) on improving the fire safety of polypropylene (PP). The composites based on PP, flame retardant master batch (MB-FR, 25 wt% PP?50 wt% decabromodiphenyl ether (DBDPE)?25% antimony trioxide (ATO)) and ONSep were prepared via melt blending. The results of the limiting oxygen index (LOI) and vertical burning rating (UL-94) test indicated that PP/40 wt% MB composites had no rating with seriously dripping phenomenon, while the LOI value was only 22.5. However, as 4 wt% ONSep was added in PP/40 wt% MB composites, the composites achieved UL94 V-0 rating and the LOI value was 24.3. In comparison, PP/50 wt% MB composites could not reach the V-0 rating either. The TGA results revealed that the addition of ONSep enhanced the thermal stability of the PP/MB-FR composites. The cone calorimeter results indicated that the heat release rate, average mass loss rate, smoke production rate and smoke temperature of the PP/40 wt% MB-FR/4 wt% ONSep composites decreased in comparison with those of PP/40 wt% MB-FR composites. Simultaneously, the Young modulus and impact strength were also much better improved with the increase of ONSep loading. Therefore, the synergistic flame retardancy of ONSep in PP/MB-FR matrix significantly containing a halogen based flame retardant (DBDPE) significantly improved the fire safety and mechanical properties of the composites, and allowed to decrease the total amount of brominated fire retardants. © 2015 SIOC, CAS, Shanghai, & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.