Effect of DOP-based compounds on fire retardancy, thermal stability, and mechanical properties of DGEBA cured with 4,4′-DDS |
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Authors: | R M Perez J K W Sandler V Altstädt T Hoffmann D Pospiech M Ciesielski M Döring |
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Affiliation: | 1. Polymer Engineering, University of Bayreuth, Universit?tsstra?e 30, D-95447, Bayreuth, Germany 2. Dept. of Polymer Structures, Faculty of Macromolecular Chemistry, Leibniz-Institute of Polymer Research Dresden, Hohe Str. 6, D-01069, Dresden, Germany 3. Institute of Technical Chemistry, Research Center Karlsruhe GmbH, D-76021, Karlsruhe, Germany
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Abstract: | The structure-property-relationships, thermal stability and flame retardancy of a DGEBA-DDS system containing various organo-phosphorus
compounds as flame retardants is investigated. Three non-reactive (DOP-ethyl, DOP-ethylhexyl and DOP-cyanur) and one reactive
(DOP-glycidyl) phosphorous compounds are added separately to the epoxy resin and the mixtures are cured with 4,4′-DDS in a
substoichiometric ratio. The addition of such DOPO-compounds leads to improved flame retardancy at low phosphorus contents
of about 2 wt.% (about 20 wt.% of additive) without significantly affecting other important properties such as fracture toughness
(Klc) and glass transition temperature (Tg) of the matrix. Neither the type nor the amount of additive affects the fracture toughness of cured epoxies up to additive
concentrations of between 18 and 24 wt.%. Furthermore, the loss in glass transition temperature of the cured resin can be
correlated with the amount and chemical reactivity of the organo-phosphorus additive. The reactive DOP-glycidyl and the non-reactive
DOP-cyanur additive are observed to maintain the highest glass transition temperature of the epoxy system mainly due to a
higher extent of the cross-linking reaction. The results presented in this study highlight the potential of optimising the
flame retardancy and the resulting physical and mechanical properties of epoxy systems for liquid composite moulding applications
by varying the chemical structure of the organo-phosphorus compounds. |
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