Synthetic zinc layered hydroxide salts intercalated with anionic azo dyes as fillers into high-density polyethylene composites: first insights

Zimmermann, Ademir; Jaerger, Silvia; Zawadzki, Sônia Faria; Wypych, Fernando

doi:10.1007/s10965-013-0224-3

Cited by 30 publications

(16 citation statements)

References 31 publications

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“…16 When one talks about colored nanocomposites, many obstacles can be taken into account as often when dyes or pigments are added, it can cause degradation changing polymer properties and promote dye salts migration and exudation to the environment due to the low chemical affinity with the polymer. One advantage is the possibility of producing colored polymers by the intercalation of anionic dyes into layered materials avoiding migration and exudation, [22][23][24] the use of colored cations in the layer composition as pigments or even both alternatives. Although there are advantages to use multifunctional filler having also the capacity to attribute color to the polymer, according to the authors knowledge, the last two alternatives were never reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

New Alternative to Produce Colored Polymer Nanocomposites: Organophilic Ni/Al and Co/Al Layered Double Hydroxide as Fillers into Low-Density Polyethylene

Jaerger¹,

Zawadzki²,

Leuteritz³

2017

J. Braz. Chem. Soc.

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) and pink (Co 2+ /Al 3+ ) layered double hydroxides (LDH) (molar ratio of 3:1) were intercalated with several organic anions and used as functional colored fillers into low density polyethylene (LDPE) by melt mixing in amounts of 0.2 to 7 wt.%. Scanning electron microscopic (SEM) results of LDPE nanocomposites indicated that with low percentage of filler, all the LDH samples showed efficient delamination/exfoliation in the polymer matrix. Fillers added to LDPE with concentrations of 0.2, 0.5, 2 and 5% presented, in general, maintenance of Young's modulus and tensile strength, tending to the reduction with a loading of 7%. Most of the nanocomposites presented similar elongations, although NiUS stood out, with an elongation increase of 300%. Differential scanning calorimetry (DSC) indicated the effect of the Co/Al-LDH in inducing the formation of LDPE crystalline domains, especially at higher temperature than neat LDPE.

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Section: Introductionmentioning

confidence: 99%

New Alternative to Produce Colored Polymer Nanocomposites: Organophilic Ni/Al and Co/Al Layered Double Hydroxide as Fillers into Low-Density Polyethylene

Jaerger¹,

Zawadzki²,

Leuteritz³

2017

J. Braz. Chem. Soc.

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“…Layered double hydroxides (LDH) [7] and layered hydroxide salts (LHS) [8] belong to this family of compounds, and even though the former has been fairly well-studied, the latter is rarely found in the literature, especially when used as fillers in polymer composites [9][10][11][12][13] . For example, improvement of the thermal-oxidative degradation of LDPE and a slight increase in crystallization temperature was evidenced by Muksing et al [14] , whereas significant improvement of the thermal-oxidative stability and remarkable reduction of the oxygen permeability of LDPE was reported by Coiai et al [15] .…”

Section: Introductionmentioning

confidence: 99%

Zinc layered hydroxide salts: intercalation and incorporation into low-density polyethylene

et al. 2014

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Abstract:In this study, polymer composites using low-density polyethylene (LDPE) and layered hydroxide salts (LHS) were synthesized. The following compositions of LHS were obtained Zn 5 (OH) 8 (A n-) 2/n .yH 2 O, where A was varied in order to obtain hydrophilic (A = NO 3 -) or hydrophobic (A = DDS --dodecyl sulfate or DBS --dodecyl benzene sulfonate). Synthesis was carried out by co-precipitation in alkaline medium and drying, being followed by characterization via Fourier-transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy. A variable amount of filler was then incorporated into the LDPE via extrusion, which was then injection molded to obtain specimens for evaluating tensile properties (Young's modulus, tensile strength, strain at break and toughness). For comparison, the sodium salts of the surfactants (NaDDS and NaDBS) were also used as fillers in LDPE. The X-ray diffraction results indicated that the hydrophobic LHS were exfoliated in the polymer matrix, whereas the hydrophilic LHS was only delaminated. In the LDPE composites, melting and crystallization temperatures were nearly constant, along with the crystallinity indexes. The mechanical properties were mainly varied when the organophilic LHS was used. Overall, fillers based on LHS, especially those containing hydrophobic anions, may be interesting alternatives in the production of reinforced thermoplastics.

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“…The steam treatment of the dye-free film induced the formation of the layered zinc hydroxide salt and ZnO, which exhibited broad peaks at ca. [45][46][47]. It has been reported that the layered zinc hydroxide salts can exchange the anions between the interlayers for some anions [42].…”

Section: Resultsmentioning

confidence: 99%

Interaction between dye and zinc in the dye-dispersing ZnO films prepared by a wet process

et al. 2014

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Dye-dispersing ZnO precursor gel films were prepared on indium tin oxide electrodes from a zinc acetate solution containing eosin Y by dip-coating, steam treatment, and then heating at a low temperature. The electronic interaction between the dye and zinc in the dye-dispersing gel films were investigated by spectroscopic and electrochemical measurements. A photocurrent was observed in the dye-dispersing gel electrodes before the steam treatment. The photocurrent value increased by the steam treatment and heating due to crystallization of the gel and removal of organic impurities. The dye molecules existed between the interlayers of the layered zinc hydroxide coexisting with the ZnO. The photoexcited electron in the dye should be injected into the ZnO conduction band via the layered zinc hydroxide. The value increased with an increase in the dye content even though the ZnO crystallinity decreased.The dye-zinc interaction, i.e., the complex formation and photoinduced electron injection, played an important role in the electron transport and photoelectric conversion.

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Synthetic zinc layered hydroxide salts intercalated with anionic azo dyes as fillers into high-density polyethylene composites: first insights

Cited by 30 publications

References 31 publications

New Alternative to Produce Colored Polymer Nanocomposites: Organophilic Ni/Al and Co/Al Layered Double Hydroxide as Fillers into Low-Density Polyethylene

New Alternative to Produce Colored Polymer Nanocomposites: Organophilic Ni/Al and Co/Al Layered Double Hydroxide as Fillers into Low-Density Polyethylene

Zinc layered hydroxide salts: intercalation and incorporation into low-density polyethylene

Interaction between dye and zinc in the dye-dispersing ZnO films prepared by a wet process

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