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Start Over Author "Schartel, Bernhard" Journal macromolecular materials and engineering
13 results on '"Schartel, Bernhard"'

3. Macromol. Mater. Eng. 2/2018

Author

Schwarzer, Madeleine, primary, Korwitz, Andreas, additional, Komber, Hartmut, additional, Häußler, Liane, additional, Dittrich, Bettina, additional, Schartel, Bernhard, additional, and Pospiech, Doris, additional

Published
2018
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11. A New Halogen‐Free Flame Retardant Based on 9,10‐Dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide for Epoxy Resins and their Carbon Fiber Composites for the Automotive and Aviation Industries

Author

Perret, Birgit, Schartel, Bernhard, Stöß, Kai, Ciesielski, Michael, Diederichs, Jan, Döring, Manfred, Krämer, Johannes, and Altstädt, Volker

Abstract

The pyrolysis and fire behavior of halogen‐free flame‐retarded DGEBA/DMC, RTM6 and their corresponding 60 vol.‐% carbon fibers (CF) composites were investigated. A novel phosphorous compound (DOPI) was used. Its action is dependent on the epoxy matrix. DGEBA/DMC and DOPI decompose independently of each other. Only flame inhibition occurs in the gas phase. RTM6 shows flame inhibition and a condensed phase interaction increasing charring. Both mechanisms decrease with increasing irradiance, whereas in RTM6‐CF charring is suppressed at low ones. RTM6 + DOPI shows a higher LOI (34.2%) than DGEBA/DMC + DOPI and a V‐0 classification in UL 94. Adding CF only enhances the LOI, DOPI + CF leads to a superposition in LOI for DGEBA/DMC‐CF + DOPI (31.8%, V‐0) and a synergism for RTM6‐CF + DOPI (47.7%, V‐0).

Published
2011
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12. A Novel DOPOBased Diamine as Hardener and Flame Retardant for Epoxy Resin Systems

Author

Artner, Johannes, Ciesielski, Michael, Walter, Olaf, Döring, Manfred, Perez, Raul M., Sandler, Jan K. W., Altstädt, Volker, and Schartel, Bernhard

Abstract

10Ethyl9oxa10phosphaphenanthrene10oxide 1 can be nitrated using acetic anhydride and fuming nitric acid. The nitro group is reduced using palladium on charcoal and hydrogen. These reaction conditions are used for the synthesis of an analogous DOPObased diaminic hardener 7. An evaluation of the curing behavior, mechanical properties and flammability of a neat resin made of DGEBA and 7DGEBA  7 and of a carbon fiberreinforced resin made of DGEBA, 4,4′diaminodiphenylsulfon DDS and 7DGEBA  DDS  7 shows the potential of this hardener to lead to flameretardant systems while keeping relevant properties on a high level; especially when compared to a similar system DGEBA  DDS  1.

Published
2008
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13. Surface Controlled Fire Retardancy of Polymers Using Plasma Polymerisation

Author

Schartel, Bernhard, Kühn, Gerhard, Mix, Renate, and Friedrich, Jörg

Abstract

Fire retardant coatings are deposited on polyamide-66 using plasma polymerisation. Chemical composition and thickness of deposits are adjusted varying the plasma treatment based on hexamethyldisiloxane mixed with oxygen. The fire retardancy performances are evaluated using a cone calorimeter. The correlation between fire retardancy and thickness as well as chemical composition is discussed.

Published
2002
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