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Applying the flame retardant LDH as a Trojan horse for molecular flame retardants

Title data

Edenharter, Andreas ; Breu, Josef:
Applying the flame retardant LDH as a Trojan horse for molecular flame retardants.
In: Applied Clay Science. Vol. 114 (September 2015) . - pp. 603-608.
ISSN 0169-1317
DOI: https://doi.org/10.1016/j.clay.2015.07.013

Abstract in another language

The direct synthesis of Mg2Al-Cl LDH (Cl-LDH) has been accomplished by combining the urea method with the addition of NH4Cl as a buffer. It has been shown, that the buffer limits the maximum pH reached during urea hydrolysis, which in turn limits the concentration of carbonate in the reaction mixture and allows for recovery of Cl-LDH. By anion exchange into Cl-LDH phenyl phosphate (PP) was incorporated as a model flame retardant. The mechanism of this anion exchange could be shown to be topotactic rather than of dissolution/re-precipitation type. Despite hydration of PP-LDH up to a d-value of 15.8Å, no exfoliation could be observed upon applying high shear forces. With a filler content of 5wt.%, PP-LDH could be shown to significantly push the flame retardant properties of polystyrene as compared to ordinary CO3-LDH as indicated by a doubling of the reduction of the peak of heat release rate (22% and 47%, respectively).

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: LDH; Anionic clay; Hydration; Topotactic anion exchange; Flame retardancy
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP B 3
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 29 Mar 2018 07:21
Last Modified: 29 Mar 2018 07:21
URI: https://eref.uni-bayreuth.de/id/eprint/43140