Surfactant-assisted fatty acid intercalation of layered double hydroxides

Nhlapo, Nontete; Motumi, Thato; Landman, Edith; Verryn, S. M. C.; Kaci, Mustapha

doi:10.1007/s10853-007-2251-0

Cited by 73 publications

(75 citation statements)

References 49 publications

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“…Peng et al (2010) attributed such behaviour to the earlier decomposition of LDH comparated to the parent polymer. This was also observed by Nhlapo et al (2008). DTG curves (Fig.…”

Section: Characterizationsupporting

confidence: 82%

Layered Double Hydroxides as Nano Additives in Poly(ϵ-caprolactone)

Manhique

Kaci

Leuteritz

et al. 2012

Molecular Crystals and Liquid Crystals

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Poly(ε-caprolactone) MgAl -layered double hydroxides (MgAl-LDH) nanocomposites were prepared by melt intercalation. Two organically modified MgAl-LDH, stearic acid (stearate) and sodium dodecyl sulphate (SDS), were used. Nanocomposites morphology was studied by XRD and TEM. Thermal properties were analysed by TG and DSC. Although both systems showed presence of a mixed morphology, exfoliated and intercalated, MgAl-LDH stearate nanocomposites showed a better dispersion of inorganic platelets. TEM images showed the presence of individual platelets in the PCL matrix. MgAl-LDH SDS nanocomposites 1.

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“…Peng et al (2010) attributed such behaviour to the earlier decomposition of LDH comparated to the parent polymer. This was also observed by Nhlapo et al (2008). DTG curves (Fig.…”

Section: Characterizationsupporting

confidence: 82%

Layered Double Hydroxides as Nano Additives in Poly(ϵ-caprolactone)

Manhique

Kaci

Leuteritz

et al. 2012

Molecular Crystals and Liquid Crystals

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“…The stearic acid intercalated products were prepared according to a procedure described by Nhlapo et al [84]. Approximately 100 g Mn 2 Al-LDH-CO 3 or Co 2 Al-LDH-CO 3 , 47 g stearic acid and 40 g surfactant (Tween 60) were suspended in 2000 ml distilled water.…”

Section: Stearate Intercalationmentioning

confidence: 99%

Mn2Al-LDH- and Co2Al-LDH-stearate as photodegradants for LDPE film

Magagula

Nhlapo

Focke

2009

Polymer Degradation and Stability

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The layered double hydroxides (LDH) Mn 2 Al-LDH-stearate and Co 2 Al-LDH-stearate were prepared by a surfactant-assisted intercalation of the corresponding precursor LDH-CO 3 forms.These compounds were evaluated as potential photodegradant additives in low density polyethylene films with a thickness of ca. 40 mm. They were incorporated into blown polyethylene films via a 10% masterbatch. The films were subjected to accelerated ageing in a QUV weatherometer. The machine was fitted with A320 lamps and operated on a dry cycle at 63 C and an irradiance of 0.67 W/m 2 . It was found that 100 h of QUV exposure was sufficient to cause mechanical embrittlement of films containing as little as 0.1% of either active.

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“…O HDL foi sintetizado pelo método de coprecipitação [18,19] . Para início da síntese, foram adicionados ao reator água deionizada (~600 mL) e os ácido láurico e ácido palmítico, em uma mistura de 0,066/0,066 mol respectivamente, de um total de 0,132 mol.…”

Section: Síntese Do Hdlunclassified

“…Quando são comparados os resultados obtidos com o valor de espaçamento basal do ZnAl sem modificação (com ânion cloreto), 7,74 Å [8,19,22] [21][22][23] , como demonstram os resultados obtidos. Para a efetiva síntese dos nanocompósitos, a expansão do espaçamento basal dos HDLs é de fundamental importância, pois através deste aumento as forças que mantêm as lamelas do HDL unidas diminuem, permitindo a adsorção de compostos orgânicos neste domínio.…”

Section: Estrutura E Morfologia Dos Nanocompósitos De Ps/ Znal -Lpunclassified

Preparação e avaliação de nanocompósitos de poliestireno - hidróxido duplo lamelar HDL de ZnAl – organofuncionalizado com laurato/palmitato

et al. 2015

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ResumoEste trabalho descreve a síntese e caracterização de nanocompósitos de poliestireno (PS) e hidróxido duplo lamelar (HDL) formado pelos cátions de ZnAl via polimerização in situ. O HDL utilizado neste trabalho foi modificado com uma mistura de dois ânions, laurato e palmitato. Para caracterização da estrutura e morfologia dos nanocompósitos sintetizados, foram realizadas análises por difração de raios X (DRX) e microscopia eletrônica de transmissão (MET). As caracterizações térmicas, mecânicas e de flamabilidade foram realizadas via análise termogravimétrica (TGA), ensaio de flexão e ensaio de flamabilidade, respectivamente. Os resultados obtidos neste trabalho sugerem que os nanocompósitos sintetizados possuem, de uma forma geral, uma morfologia intercalada/esfoliada com melhoras em suas propriedades térmicas e mecânicas, quando comparados com o PS puro. Entretanto, não foi observado melhora na propriedade de flamabilidade. Palavras-chave: nanocompósitos, poliestireno, hidróxido duplo lamelar, propriedade térmica, propriedade mecânica. AbstractThis work describes the synthesis and characterization of polystyrene (PS) and layered double hydroxide (LDH) nanocomposites formed by ZnAl cations via in situ polymerization. The LDH used in this study was modified with a mixture of two anions: laurate and palmitate. The characterization of structure and morphology for the synthesized nanocomposites was developed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The thermal, mechanical and flammability characterizations properties were carried out via thermogravimetric analysis (TGA), bending test and flammability test, respectively. The results suggest that the nanocomposites have in general intercalated/ exfoliated morphology with improvements in thermal and mechanical properties compared to the neat PS. However no significant improvement was observed on the flammability property.

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Surfactant-assisted fatty acid intercalation of layered double hydroxides

Cited by 73 publications

References 49 publications

Layered Double Hydroxides as Nano Additives in Poly(ϵ-caprolactone)

Layered Double Hydroxides as Nano Additives in Poly(ϵ-caprolactone)

Mn2Al-LDH- and Co2Al-LDH-stearate as photodegradants for LDPE film

Preparação e avaliação de nanocompósitos de poliestireno - hidróxido duplo lamelar HDL de ZnAl – organofuncionalizado com laurato/palmitato

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