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      Comparative study of the synergistic effect of binary and ternary LDH with intumescent flame retardant on the properties of polypropylene composites

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          Abstract

          Functional LDH lead to different fire behaviors of flame retardant polypropylene composites.

          Abstract

          Organo-modified binary (MgAl-) and ternary (MgZnAl-) layered double hydroxides (LDHs) were synthesized via a co-precipitation method, and subsequently dispersed into polypropylene (PP) in combination with an intumescent flame retardant (IFR) by a melt blending process. A comparative study on the effect of binary and ternary LDHs on the mechanical, thermal properties and flammability of flame retardant PP composites was undertaken. The incorporation of either binary or ternary LDH resulted in a slightly decreased tensile strength compared to neat PP matrix; however, the Young's modulus of PP/IFR/LDH composites was improved. The synergism between either binary or ternary LDH and IFR occurred during the combustion, but the ternary LDH showed superior char-formation ability and smoke suppression over the binary one due to the presence of the element zinc. In contrast to the binary LDH, the ternary LDH produced better quality char that effectively suppressed the spread of the flame and finally extinguished the fire.

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          Self-assembly of Ni–Fe layered double hydroxide/graphene hybrids for reducing fire hazard in epoxy composites

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            Functionalized layered double hydroxide-based epoxy nanocomposites with improved flame retardancy and mechanical properties

            Aiming at developing highly efficient nano fire retardants and fire retarding epoxy resins, a series of functionalized layered double hydroxides (LDHs) based on a multi-modifier system have been developed. These functionalized LDHs were used as novel nano flame-retardants for bisphenol epoxy resins and compared with unmodified LDHs. Functionalized layered double hydroxides (LDHs) based on a multi-modifier system composed of hydroxypropyl-sulfobutyl-beta-cyclodextrin sodium (sCD), dodecylbenzenesulfonate (DBS) and taurine (T) have been designed and fabricated in this paper, aiming at developing high performance fire retardant epoxy nanocomposites. In this multi-modifier system, sCD was utilized to improve the char yield, DBS was used to enlarge the inter-layer distance of LDH and T was used to enhance the interaction between the epoxy matrix and LDH layers. Based on these functionalized LDHs, bisphenol A epoxy resin and diamino diphenyl sulfone (DDS), a series of functionalized LDH/epoxy nanocomposites have been developed. The structural morphologies of the LDH/epoxy nanocomposites were investigated by transmission electron microscopy (TEM) and wide-angle X-ray scattering (WAXS), revealing that sCD-DBS-T-LDH/EP shows a much better dispersion state than the epoxy composites containing unmodified LDHs or single modifier modified LDHs. Importantly, with only 6 wt% functionalized LDH, the sCD-DBS-T-LDH/EP nanocomposite reached V0 rating in the UL-94 vertical burning test. Furthermore, the incorporation of sCD-DBS-T-LDH into epoxy resins led to a significant reduction in peak heat release rate, total heat release and total smoke production, which exhibited superior fire resistance over its counterparts at the equivalent filler loading. The notably improved fire resistance could be attributed to the formation of the consolidated and compact char layers during combustion which significantly suppressed heat and mass transfer between the polymer matrix and flame zone. Additionally, sCD-DBS-T-LDH/EP showed the best impact and tensile strength compared to those of other LDH/epoxy composites. This work offers a new approach to develop high performance fire retardant polymer/LDH nanocomposites.
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              Effect of MgAl-layered double hydroxide exchanged with linear alkyl carboxylates on fire-retardancy of PMMA and PS

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                Author and article information

                Journal
                RSCACL
                RSC Advances
                RSC Adv.
                Royal Society of Chemistry (RSC)
                2046-2069
                2015
                2015
                : 5
                : 96
                : 78979-78985
                Affiliations
                [1 ]IMDEA Materials Institute
                [2 ]Madrid
                [3 ]Spain
                [4 ]Leibniz-Institut für Polymerforschung Dresden e. V.
                [5 ]D-01069 Dresden
                [6 ]Germany
                Article
                10.1039/C5RA15565G
                85d9881b-3d27-4cc9-8dd5-ca88fdd5ee82
                © 2015
                History

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