Arrangement of layered double hydroxide in a polyethylene matrix studied by a combination of complementary methods

Purohit, Purv J.; Wang, De‐Yi; Emmerling, Franziska; Thünemann, Andreas F.; Heinrich, Gert; Schönhals, Andreas

doi:10.1016/j.polymer.2012.03.041

Cited by 41 publications

(21 citation statements)

References 66 publications

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“…Moreover, since the chemical composition can be precisely controlled, these materials can find applications where the chemical purity is required, for example in food, medical, and microelectronic industries . In general, LDH has a layered structure similar to silica clays, but the layers positively charged with an anionic interlayer gallery can be exchanged by bulk organic anions; when the interlayer distance is increased, polymer chains can intercalate into the gallery and thus nanocomposites with an intercalated and/or exfoliated morphology can be obtained …”

Section: Introductionmentioning

confidence: 99%

Melt spinning and drawing of polyethylene nanocomposite fibers with organically modified hydrotalcite

Fambri

Dabrowska

Pegoretti

et al. 2013

J of Applied Polymer Sci

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Fibers of high density polyethylene (HDPE)/organically modified hydrotalcite (LDH) were produced by melt intercalation in a two‐step process consisting of twin‐screw extrusion and hot drawing. The optimum drawing temperature was 125°C at which the draw ratios up to 20 could be achieved. XRD analysis revealed intercalation with a high degree of exfoliation for the composites with 1–2% of LDH. Higher thermal stability of nanofilled fibers was confirmed by TGA analysis. DSC data indicated that dispersed LDH particles act as a nucleating agent. Crystallization kinetics of the HDPE matrix in the composite fibers is characterized by two transition temperatures, that is, for Regimes I/II at 123°C and for Regimes II/III ranging between 114–119°C as a function of the nanocomposite composition. Fibers with 1–2% of LDH show for the drawing ratios up to 15 a higher elastic modulus, 9.0–9.3 GPa (with respect to 8.0 GPa of the neat HDPE), maintain tensile strength of 0.8 GPa and deformation at break of 20–25%. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40277.

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Section: Introductionmentioning

confidence: 99%

Melt spinning and drawing of polyethylene nanocomposite fibers with organically modified hydrotalcite

Fambri

Dabrowska

Pegoretti

et al. 2013

J of Applied Polymer Sci

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show abstract

“…This is in agreement with superimposed MЈЈ(ω) spectra and is explained here by the presence of PVP, which is very weakly polar (Figure 12, a). [45] Of the same amplitude at low temperature, ΔM is largely decreased at high temperature, which is expected since ΔM is proportional to the density of fluctuating dipole. This is due once again to the localization of the polymer dipole (Figure 12, b).…”

Section: Dielectric Propertiesmentioning

confidence: 72%

Formation of Single‐Layered Double‐Hydroxide Platelets in Poly(vinylpyrrolidone) and Alginate Medium: Conductive, Capacitive, and Dielectric Properties of the Hybrid Films

et al. 2012

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Direct synthesis from an adapted salt coprecipitation of single-crystalline layered double-hydroxide (LDH) platelets can be realized by using polyvinylpyrrolidone (PVP) assisted by an organo-modifying agent, alginate (ALG). The formation of LDH inorganic platelets with a Zn/Al cation composition of 2:1 was demonstrated by TEM observations as well as by a topotactic restacking reaction that used the terephthalate molecule pillaring effect. From the perspective of PVP, LDH platelets can be viewed as hybrid filler. With regards to the inorganic platelets, the dispersive medium supplied by PVP chains in association with the biopolymer is an elegant process for generating single platelets, the whole of which can form an exfoliated polymer nanocomposite structure. The resulting transparent, crack-free PVP films obtained from solvent casting were studied by electrochemical impedance spectroscopy (EIS) to evaluate their conductive, capacitive, and dielectric properties. Single LDH platelets [a]

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“…However, there are only few literatures which consider adsorption of surfactant to the layers of the nanofiller. Purohit et al . reported that the alkyl tails of SDBS were desorbed from the surface of the LDH and mixed with the polyethylene and polypropylene segments.…”

Section: Resultsmentioning

confidence: 99%

“…The two observed relaxation processes were assigned to two different regions of molecular mobility of the PESEKK segments, depending on the distance from the fGR surface. Several studies considered the structure and dynamics of nanocomposites with clay galleries via dielectric spectroscopy or NMR . These studies showed that the interfacial region had certain molecular mobility, which depended strongly on temperature.…”

Section: Resultsmentioning

confidence: 99%

Segmental dynamics of functional graphene‐filled poly(ether sulfone ether ketone ketone) nanocomposites

Shi

Wang

2016

J of Applied Polymer Sci

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The segmental dynamics of functional graphene (fGR)/poly(ether sulfone ether ketone ketone) (PESEKK) nanocomposites were investigated via differential scanning calorimetry and dynamic mechanical analysis (DMA) measurements. First, fGR was prepared using graphene oxide and sodium dodecylbenzene sulfonate. Subsequently, a series of fGR/PESEKK nanocomposites were prepared through solution blend. When the sulfone groups were introduced into the segments of PESEKK polymers, the glass transition temperature (Tg) of PESEKK was higher than that of free sulfone functionalized poly(ether ketone ketone). The fGR/PESEKK nanocomposites displayed a uniform nanostructure because of the strong interfacial interaction between fGR and PESEKK. With the increase in the fGR contents, the Tg values of fGR/PESEKK nanocomposites decreased. Two loss factor peaks were noted in the fGR/PESEKK nanocomposites, which were characterized via DMA. The α′‐relaxation of the nanocomposites at low temperature was assigned to polymer chains close to the polymer/filler interface with mobility higher than that in the bulk unfilled PESEKK (α‐relaxation). © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44391.

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Arrangement of layered double hydroxide in a polyethylene matrix studied by a combination of complementary methods

Cited by 41 publications

References 66 publications

Melt spinning and drawing of polyethylene nanocomposite fibers with organically modified hydrotalcite

Melt spinning and drawing of polyethylene nanocomposite fibers with organically modified hydrotalcite

Formation of Single‐Layered Double‐Hydroxide Platelets in Poly(vinylpyrrolidone) and Alginate Medium: Conductive, Capacitive, and Dielectric Properties of the Hybrid Films

Segmental dynamics of functional graphene‐filled poly(ether sulfone ether ketone ketone) nanocomposites

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