One-Step Synthesis of Organic LDH and Its Comparison with Regeneration and Anion Exchange Method

Wang, De‐Yi; Costa, Francis Reny; Vyalikh, Anastasia; Leuteritz, Andreas; Scheler, Ulrich; Jehnichen, Dieter; Wagenknecht, Udo; Häußler, Liane; Heinrich, Gert

doi:10.1021/cm901238a

Cited by 125 publications

(92 citation statements)

References 30 publications

(31 reference statements)

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“…There are several methods reported in the literature for preparing organo-modified LDHs, i.e. anionexchange of a precursor LDH, regeneration, thermal reaction, direct synthesis by coprecipitation, and the more recent one-step synthesis method [15][16][17]. Among all of the methods described, anion exchange is one of the more commonly used and several anionic species, such as phosphates, carboxylates, sulfonates, and sulfates, have been used [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of surfactant alkyl chain length on the dispersion, and thermal and dynamic mechanical properties of LDPE/organo-LDH composites

Muksing¹,

Magaraphan²,

Coiai³

et al. 2011

Express Polym. Lett.

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Abstract. Low density polyethylene/layered double hydroxide (LDH) composites were prepared via melt compounding using different kinds of organo-LDHs and polyethylene-grafted maleic anhydride as the compatibilizer. The organo-LDHs were successfully prepared by converting a commercial MgAl-carbonate LDH into a MgAl-nitrate LDH, which was later modified by anion exchange with linear and branched sodium alkyl sulfates having different alkyl chain lengths (n c = 6, 12 and 20). It was observed that, depending on the size of the surfactant alkyl chain, different degrees of polymer chain intercalation were achieved, which is a function of the interlayer distance of the organo-LDHs, of the packing level of the alkyl chains, and of the different interaction levels between the surfactant and the polymer chains. In particular, when the number of carbon atoms of the surfactant alkyl chain is larger than 12, the intercalation of polymer chains in the interlayer space and depression of the formation of large aggregates of organo-LDH platelets are favored. A remarkable improvement of the thermal-oxidative degradation was evidenced for all of the composites; whereas only a slight increase of the crystallization temperature and no significant changes of both melting temperature and degree of crystallinity were achieved. By thermodynamic mechanical analysis, it was evidenced that a softening of the matrix is may be due to the plasticizing effect of the surfactant.

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Section: Introductionmentioning

confidence: 99%

Effect of surfactant alkyl chain length on the dispersion, and thermal and dynamic mechanical properties of LDPE/organo-LDH composites

Muksing¹,

Magaraphan²,

Coiai³

et al. 2011

Express Polym. Lett.

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“…For example, the temperature at 10% weight loss for neat PBA was 336. 8 C, and surprisingly, it increased to 385.8 C with the loading of 0.1 wt % m-LDH. With the addition of more m-LDH to the PLLA matrix, the temperature at 10% weight loss decreased to 353.1 and 338.2 C for the 0.2 and 0.5 wt % PBA/m-LDH nanocomposites, respectively.…”

Section: Characterization Of the Prepared M-ldhmentioning

confidence: 92%

“…Layered double hydroxides (LDHs) belong to a class of synthetic twodimensional inorganic materials with lamellar structures. 8 Compared to two-dimensional montmorillonite, LDHs retain strong electrostatic interactions and a high charge density between hydroxide layers; this makes the delamination of LDHs within the polymer matrix more challenging. 9 One resolution is to expand the interlayer distance of LDH platelets with organomodifiers; this would also modify the surface properties of the LDHs from the hydrophilic attributes into hydrophobic ones.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties and degradation behavior of poly(1,4‐butylene adipate)/modified layered double hydroxide nanocomposites

Chu

Hang

Chen

et al. 2015

J of Applied Polymer Sci

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In this study, poly(1,4-butylene adipate) (PBA)/organomodified layered double hydroxide (m-LDH) nanocomposites were synthesized and characterized as a new material for green materials use. m-LDH was initially prepared with magnesium nitrate hexahydrate, aluminum nitrate-9-hydrate, oleic acid, and sorbitol by a novel one-step coprecipitation method to intercalate the oleic acid and sorbitol organomodifier into the interlayer of the layered double hydroxide. The solution mixing process was then applied and shown to be an efficient method for fabricating the PBA/m-LDH nanocomposites. The m-LDH characterized by X-ray diffraction (XRD) showed a high interlayer spacing of 58.8 Å . The morphology and thermal properties of the PBA/m-LDH nanocomposites were characterized with XRD, transmission electron microscopy, and thermogravimetric analysis. It was shown that the m-LDH was well distributed in the PBA matrix and that the thermal properties of the PBA/m-LDH nanocomposites significantly improved with a loading of 0.1 wt % m-LDH. Finally, the biodegradability of the PBA/m-LDH nanocomposites was tested with lipase from Pseudomonas fluorescens as a microbial catalyst. It was shown that an addition of m-LDH up to 0.5% resulted in a significant difference in terms of the biodegradability. After 120 h of degradation, the residual weight and surface morphology of the composite films were affected by the presence of m-LDH.

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“…In addition, the stretching vibrations of ACH 2 and ACH 3 are detected as sharp peaks at 2924 and 2853 cm 21 . Peaks at 1181 and 1037 cm 21 are related to the symmetric and antisymmetric stretching vibrations of sulfonate groups [27,29]. The presence of ACH 2 and sulfonate groups indicates that SDBS is present in the interlayer galleries of MAl LDHs.…”

Section: Structure and Morphologymentioning

confidence: 99%

Preparation and flame retardancy of polystyrene nanocomposites based on layered double hydroxides

Han

Shen

et al. 2015

Polym. Compos.

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Various layered double hydroxides (LDHs), including MgAl, CoAl, NiAl, and ZnAl-LDHs, were synthesized and modified using sodium dodecyl benzene sulfonate. Nonhalogen flame-retardant PS/LDHs nanocomposites were prepared via melt mixing method. The structure of PS/LDHs nanocomposites was investigated by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) pattern technique, and scanning electronic microscope. Results from XRD indicated that intercalated/exfoliated structure was achieved in the polystyrene matrix. Dynamic mechanical thermal analysis suggested that the storage modulus and T g for the PS/LDHs nanocomposites was efficiently improved. Thermal and flammability properties of PS nanocomposites were investigated using thermogravimetry and cone calorimetry. Thermal analysis was evaluated and the prepared nanocomposites showed slightly lower thermal stability probably due to the presence of LDH, which starts to decompose at a lower temperature. Compared with neat PS, the peak heat release rate of PS/MgAl and PS/ZnAl-LDHs nanocomposites filled with 5 wt% LDHs is reduced by 7 and 12%, respectively. Among all LDHs, MgAl, and ZnAl-LDHs had a better smoke suppression effect with a reduction of peak smoke production rate and CO release rate of 37 and 44%, respectively. POLYM. COMPOS., 00:000-000, 2015.

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One-Step Synthesis of Organic LDH and Its Comparison with Regeneration and Anion Exchange Method

Cited by 125 publications

References 30 publications

Effect of surfactant alkyl chain length on the dispersion, and thermal and dynamic mechanical properties of LDPE/organo-LDH composites

Effect of surfactant alkyl chain length on the dispersion, and thermal and dynamic mechanical properties of LDPE/organo-LDH composites

Thermal properties and degradation behavior of poly(1,4‐butylene adipate)/modified layered double hydroxide nanocomposites

Preparation and flame retardancy of polystyrene nanocomposites based on layered double hydroxides

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