Influence of the Structure of Acrylate Groups on the Flame Retardant Behavior of Ethylene Acrylate Copolymers Modified with Chalk and Silicone Elastomer

Abstract

This study treats the flame retardant effects of different ethylene acrylate copolymers used in a chalk and silicone elastomer system, specifically the flame retardant chemistry and behavior at lower temperatures. The presence or absence of ester pyrolysis, formation of ionomers or other crosslinks, viscosity, and the effects of these factors on the formation and stability of the intumescent structure formed during heating are discussed. The effects of the acrylate content and melt flow rate in flame retardant compounds based on ethylene butyl acrylate copolymer and ethylene ethyl acrylate copolymer are examined. Results of oxygen index, cone calorimetry (including visual observations), dripping, viscosity measurement, thermogravimetric analysis, and infrared spectroscopy are reported.

Keywords

flame retardant ethylene acrylate copolymer calcium carbonate silicone elastomer ester pyrolysis ionomer formation intumescent structure.

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References

Hermansson, A. , Hjertberg, T. and Sultan, B.-Å. (2003). The Flame Retardant Mechanism of Polyolefins Modified with Chalk and Silicone Elastomer, Fire and Materials, 27: 51—70.

Sultan, B.-Å. and Sörvik, E. (1991). Thermal Degradation of EVA and EBA — A Comparison. II. Changes in Unsaturation and Side Group Structure, Journal of Applied Polymer Science, 43: 1747—1759.

Sultan, B.-Å. and Sörvik, E. (1991). Thermal Degradation of EVA and EBA — A Comparison. I. Volatile Decomposition Products, Journal of Applied Polymer Science, 43: 1737—1745.

Sultan, B.-Å. , Ericson, K. , Hirvensalo, M. , et al. (1998). Novel Halogen Free Flame Retardant Polyolefins Intended for Internal Wiring — Properties and Flame Retardant Mechanism , In: Proceedings of International Wire and Cable Symposium, 47th, Philadelphia.

Brauman, S. (1979). Char-forming Synthetic Polymers. 2. Char Characterization , Journal of Fire Retardant Chemistry, 6: 266.

Iso4589 :1984 (1984). Plastics- Determination of Flammability by Oxygen Index, International Organization for Standardization.

Iso5660-1 :1993 (1993). Fire Tests- Reaction to Fire Part 1: Rate of Heat Release from Building Products (Cone calorimeter method), International Organization for Standardization.

Nf P92-505 (1995). Bâtiment- Essais de réaction au feu des matériaux, l'Association Francaise de Normalisation (AFNOR).

Holmström, A. and Sörvik, E. (1970). Thermal Degradation of Polyethylene in a Nitrogen Atmosphere of Low Oxygen Content, Journal of Chromatography, 53: 95—108.

10.

Hummel, D.O. and Scholl, F. (1981). Atlas der Polymer — und Kunststoffanalyse , Carl Hanser Verlag/Verlag Chemie.

11.

Pouchert, C.J. (1985). The Aldrich Library of FT-IR Spectra, Milwaukee, Aldrich Chemical Company, Inc., USA.

12.

Colthup, N. , Daly, D.H. and Wiberley, S.E. (1964). Introduction to Infrared and Raman Spectroscopy, New York and London, Academic Press.

13.

Grassie, N. and Scott, G. (1985). Polymer Degradation and Stabilisation, Cambridge University Press, Cambridge.

14.

Hermansson, A. , Hjertberg, T. and Sultan, B.-Å. (2005). Linking the Flame Retardant Mechanism of an Ethylene-acrylate Copolymer, Chalk and Silicone Elastomer System with its Intumescent Behaviour, Fire and Materials, 29(6): 407—423.

15.

Mc Neill, I.C. and Mohammed, M.H. (1995). A Comparison of the Thermal Degradation Behaviour of Ethylene-ethyl Acrylate Copolymer, Low Density Polyethylene and Poly(ethyl acrylate). Polymer Degradation and Stability, 48: 175—187.

16.

Geyssant, J. (2001). Geology of Calcium Carbonate , In: Tegethoff, F.W. (ed.), Calcium Carbonate. From the Cretaceous Period into the 21st Century, 2001 English edition ed. Basel, Birkhäuser Verlag .

17.

Mcneill, I.C. , Jamieson, A. , Toshand , D.J. , et al. (1976). The Thermal Degradation of Copolymers of Vinyl Acetate with Methyl Methacrylate and Other Monomers, European Polymer Journal, 12(5): 305—312.

18.

Jäger, K.-M. , Dammert, R. and Sultan, B.-Å. (2002). Thermal Degradation Studies of Different Polar Polyethylene Copolymers, Journal of Applied Polymer Science, 84(7): 1465—1473.

19.

Zeng, W.R. , Li, S.F. and Chow, W.K. (2002). Preliminary Studies on Burning Behaviour of Polymethylmethacrylate (PMMA), Journal of Fire Sciences, 20(4): 297—317.