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30 results on '"Machotova, Jana"'

28. Synthesis and Application of Hexaallylamino- cyclo -triphosphazene as Flame Retardant in Latex Coatings.

Author

Machotova, Jana, Zarybnicka, Lucie, Ruckerova, Adela, Bacovska, Radka, Rychly, Jozef, and Imramovsky, Ales

Subjects
*PHOSPHAZENES, *FIREPROOFING agents, *NUCLEOPHILIC substitution reactions, *ALLYLAMINES, *COPOLYMERS, *EMULSION polymerization
Abstract

The paper deals with a novel flame retardant and its application in waterborne coatings. The flame retardant was synthesized from hexachloro-cyclo-triphosphazene by nucleophilic substitution with allylamine. Functionalized emulsion copolymers bearing in the structure hexaallylamino-cyclo-triphosphazene were prepared by the semicontinuous emulsion polymerization. The latexes were used as the main component of transparent coating systems cured by melamine formaldehyde resin. The incorporation hexaallylamino-cyclo-triphosphazene did not affect transparency, flexibility, and toughness of resulting coatings and increased their flame stability in terms of the amount of smoke release and maximum average rate of heat emission indicating a slower flame spread during the material combustion. [ABSTRACT FROM AUTHOR]

Published
2017
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30. Effect of Cyclotriphosphazene-Based Curing Agents on the Flame Resistance of Epoxy Resins.

Author

Zarybnicka, Lucie, Machotova, Jana, Kopecka, Radka, Sevcik, Radek, Hudakova, Martina, Pokorny, Jaroslav, and Sal, Jiri

Subjects
*EPOXY resins, *ENTHALPY, *CURING, *CHEMICAL properties, *FLAME spread, *FLAME
Abstract

Epoxy resins are characterized by excellent properties such as chemical resistance, shape stability, hardness and heat resistance, but they present low flame resistance. In this work, the synthesized derivatives, namely hexacyclohexylamino-cyclotriphosphazene (HCACTP) and novel diaminotetracyclohexylamino-cyclotriphosphazene (DTCATP), were applied as curing agents for halogen-free flame retarding epoxy materials. The thermal properties and combustion behavior of the cured epoxy resins were investigated. The obtained results revealed that the application of both derivatives significantly increased flame resistance. The epoxy resins cured with HCACTP and DTCATP exhibited lower total heat release together with lower total smoke production compared to the epoxy materials based on conventional curing agents (dipropylenetriamine and ethylenediamine). Comparing both derivatives, the HCACTP-cured epoxy resin was found to provide a higher flame resistance. The designed novel class of epoxy materials may be used for the preparation of materials with improved flame resistance properties in terms of flame spreading and smoke inhibition. [ABSTRACT FROM AUTHOR]

Published
2021
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