Layered double hydroxides intercalated with borate anions: Fire and thermal properties in ethylene vinyl acetate copolymer

Nyambo, Calistor; Wilkie, Charles A.

doi:10.1016/j.polymdegradstab.2009.02.001

Cited by 77 publications

(44 citation statements)

References 31 publications

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“…10 Recently, simple LDHs containing inorganic anions have been employed as inorganic UV blocking materials for the protection of asphalt and rubber against UV aging. LDHs are a class of anionic clays 7 which have received much attention from both the chemical industry and academia in view of their actual and potential applications in catalysis, 8 electrode materials 9 and polymer additives.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of host–guest UV-blocking materials by intercalation of fluorescent anions into layered double hydroxides

Wang

Xia

et al. 2015

RSC Adv.

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Materials for blocking UV light play important roles in a variety of areas such as protecting the human skin and increasing the lifetime of polymers. In this work, a new type of host-guest UV-blocking material has been synthesized by the introduction of a fluorescent anion, 2-[2-[4-[2-(4-carboxyphenyl)vinyl]phenyl]vinyl]benzoate (CPBA), into the interlayer galleries of a ZnAl-NO 3 layered double hydroxide (LDH) precursor by an anion-exchange method. The structure and the thermal and photostability of the intercalated ZnAl-CPBA-LDH were investigated by powder X-ray diffraction (XRD), infrared spectroscopy (FTIR), thermogravimetry and differential thermal analysis (TG-DTA), fluorescence spectroscopy and UVvis spectroscopy. The supramolecular layered host-guest structure of ZnAl-CPBA-LDH enables both physical shielding and absorption of UV light. Furthermore, in contrast to conventional UV blocking materials-which convert UV light into thermal energy-the CPBA anions in the LDH interlayer galleries convert UV light (in the range 250-380 nm) into lower energy fluorescence emission (l em max ¼ 430 nm), thus reducing the thermal aging of the polymer composite materials. Intercalation of the CPBA anionsinto the LDH host also markedly enhances the thermal stability of CPBA. In polypropylene (PP) aging performance tests, after adding 1-5 wt% ZnAl-CPBA-LDH to PP, the resistance to UV degradation of the resulting ZnAl-CPBA-LDH/PP composites is higher than that of pristine PP or a CPBA/PP composite. Therefore, this work provides a way to construct a new type of host-guest layered material for UVblocking applications.

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Section: Introductionmentioning

confidence: 99%

Fabrication of host–guest UV-blocking materials by intercalation of fluorescent anions into layered double hydroxides

Wang

Xia

et al. 2015

RSC Adv.

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“…LDHs with intercalated borate anions were also found to be better flame retardants in EVA when compared to conventional flame retardant fillers such as ATH, MH, or zinc hydroxide (ZH). Nyambo and Wilkie [15] found that at 40 wt% loading, borate-intercalated Mg/Al and Zn/Al LDHs showed a significantly higher reduction of the PHRR (74% and 77%) in EVA/LDH composites than those consisting of ZH (47%), MH (65%), and their combinations. However, at similar loadings, ATH and zinc borate resulted in a higher reduction in the PHRR (89%) when compared to that of LDHs (Table 2).…”

Section: Flame Retardancy Of Ldhs In Ethyleneevinyl Acetate Copolymersmentioning

confidence: 99%

“…Cone Calorimeter Data[15] for Ethylene Vinyl Acetate Composites Obtained at an Incident Heat Flux of 35 kW m À2…”

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confidence: 99%

Layered Double Hydroxides

Shanmuganathan

Ellison

2014

Polymer Green Flame Retardants

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“…Initially there is a release of acetic acid gas caused by the deacetylation followed by the production of a wide range of products such as hydroxyl or hydroperoxides, a mixture of carbonyl products (ketones and α , β ‐unsaturated groups), lactones, and a mixture of substituted vinyl products . Inorganic fillers that were said to improve the flame retardancy of EVA copolymers include metal hydroxides (Mg(OH) 2 and Al(OH) 3 ), mixtures of ammonium polyphosphate, pentaerythritol, and melamine .…”

Section: Introductionmentioning

confidence: 99%

An experimental design approach in formulating a ceramifiable EVA/PDMS composite coating for electric cable insulation

2015

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The study used D-optimal mixture design of experiments to formulate a ceramifiable EVA/PDMS composite with optimized ceramified flexural strength properties after being exposed to elevated temperatures. The ideal amounts of inorganic fillers and their interaction within the polymer composite were studied. It was found that good polymer and ceramic properties were achieved when using 59% EVA/PDMS polymer blend with inorganic fillers of 11% calcium carbonate, 10% aluminium hydroxide, 11% muscovite mica, and 9% calcined kaolinite, respectively. TGA, SEM, and PXRD were employed to study the behavioral changes of the EVA/PDMS composite during and postceramification process. Although all inorganic fillers used were important, muscovite mica played a special role not only in the ceramification process, but also in keeping the ceramic product physically stable. Microstructural analysis of the cross-sectional area of the ceramic product showed that it was multilayered with an inhomogeneous distribution of the chemical composition across its layers. POLYM. COMPOS., 00:000-000, 2015.

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Layered double hydroxides intercalated with borate anions: Fire and thermal properties in ethylene vinyl acetate copolymer

Abstract: This paper is NOT THE PUBLISHED VERSION; but the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in th citation below.

Cited by 77 publications

References 31 publications

Fabrication of host–guest UV-blocking materials by intercalation of fluorescent anions into layered double hydroxides

Fabrication of host–guest UV-blocking materials by intercalation of fluorescent anions into layered double hydroxides

Layered Double Hydroxides

An experimental design approach in formulating a ceramifiable EVA/PDMS composite coating for electric cable insulation

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