Compósitos de poli(álcool vinílico) contendo hidroxissais lamelares de zinco, intercalados com corantes aniônicos azo (tropaeolina 0 e tropaeolina 00)

Silva, Marlon Luiz Neves da; Marangoni, Rafael; Silva, Aline Hara da; Schreiner, W. H.

doi:10.1590/s0104-14282013005000026

Cited by 5 publications

(5 citation statements)

References 32 publications

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“…The thermal properties and flame retardancy of polyolefins can be improved by adding small amounts of inorganic particles [e.g., Mg(OH) 2 ], which are mechanically mixed with the polymer. However, this process results in poor dispersion, which can negatively impact the performance of the polymer …”

Section: Introductionmentioning

confidence: 99%

“…To try to overcome this and other problems, organomodified LDHs have recently been proposed as alternative inorganic materials to be used as flame‐retardant (FR) multifunctional fillers in the formulation of polymeric nanocomposite, including as FR . However, LDHs with different metal contents and different organic anions can affect otherwise thermal and flammability properties of nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Thermal and flammability properties influenced by Zn/Al, Co/Al, and Ni/Al layered double hydroxide in low‐density polyethylene nanocomposites

Jaerger¹

2019

J of Applied Polymer Sci

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Layered double hydroxide (LDH) containing different metal constituents (Zn, Co, and Ni) was intercalated with different organic anions and has been used as fillers in low‐density polyethylene (LDPE), and its thermal and flammability behavior was evaluated. The best thermal stability (∆T0.5 = 21 °C) was obtained with the LDPE‐Ni/Al‐dodecyl sulfate (4 wt %) nanocomposite. Addition of hydrophobic LDHs systematically decreases the enthalpy of melting and crystallization compared to the neat polymer. In LDPE‐Co/Al‐dodecyl sulfate (2 wt %) nanocomposite, the melting and crystallization enthalpies declined by about 45 J/g, indicating a good interaction of the filler with the polymer matrix. A reduction of 20% of the flammability for the LDPE‐Ni/Al‐stearate (4 wt %) nanocomposite was obtained. On the other hand, Zn–Co LDH as filler in LDPE nanocomposite did not affect effectively the same property. In an innovative study, results indicate that different metal constituents and interlayer anion of LDH as filler can change thermal and flammability properties of the polymer nanocomposite. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48737.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal and flammability properties influenced by Zn/Al, Co/Al, and Ni/Al layered double hydroxide in low‐density polyethylene nanocomposites

Jaerger¹

2019

J of Applied Polymer Sci

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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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“…Esses ânions derivados de corantes azo e outros ânions hidrofóbicos já foram anteriormente intercalados em HDLs e outra classe de materiais lamelares e utilizadas como cargas funcionais em nanocompósitos poliméricos hidrofílicos e hidrofóbicos, especialmente no nosso grupo de pesquisas [6][7][8][9][10][11][12][13][14][15][16] , porém não em polietileno de alta densidade.…”

Section: -Nanocompósitos Poliméricos De Polietileno De Alta Densidadeunclassified

Nanocompósitos poliméricos de polietileno de alta densidade contendo hidróxidos duplos lamelares intercalados com anions derivados de corantes azo

2014

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Resumo: O presente trabalho descreve a síntese e caracterização de hidróxidos duplos lamelares (HDL) de Zn/Al na razão molar 2:1, os quais foram intercalados com íons cloreto hidratados e ânions derivados dos corantes azo alaranjado de metila (AM) e alaranjado II (AII). Após caracterização, os materiais foram utilizados como cargas em polietileno de alta densidade (PEAD) e nanocompósitos foram preparados por extrusão e injeção, seguindo a norma ASTM D638-10. Os teores de cargas variaram de 0,1 até 2% (incluindo-se os sais de sódio dos corantes) e os nanocompósitos homogêneos foram avaliados em relação as suas propriedades estruturais, térmicas e mecânicas. De modo geral, após a adição das cargas existe somente uma pequena influência na temperatura de fusão e cristalização do PEAD. Para os HDLs contendo o pigmento intercalado com o ânion do corante AM e sais de sódio de ambos os corantes, as propriedades mecânicas apresentaram leve aumento do módulo e tensão de ruptura e diminuição do alongamento em relação ao polímero puro e um comportamento inverso foi observado para o ânion AII, além do HDL contendo ânions cloreto hidratados. Palavras-chave: Polietileno de alta densidade, nanocompósitos, hidróxidos duplos lamelares, corantes azo, intercalação. High-Density Polyethylene Nanocomposites Containing Layered Double Hydroxides, Intercalated with Anions Derived from Azo Dyes.Abstract: The present work describes the synthesis and characterization of Zn/Al layered double hydroxides (HDL) in the molar ratio 2:1, which were intercalated with hydrated chlorine ions and anions derived from the azo dyes methylorange (AM) and orange II (AII). After characterization, the materials were used as fillers into high density polyethylene (HDPE) and the nanocomposites were prepared by extrusion and injection, following the norm ASTM D638-10. The filler contents varied from 0.1 to 2% (including the sodium dye salts) and the homogeneous nanocomposites were evaluated in relation to their structural, thermal and mechanical properties. In general, after the fillers' addition there is only a small influence in the melting and crystallization temperature of HDPE. For HDLs intercalated with the anionic dye AM and both sodium dyes, the mechanical properties presented a small influence on Young's modulus and tensile strength and an increase in elongation compared to pure HDPE and an inverse behavior was observed for the anion AII, in addition to the HDL containing hydrated chlorine anions. Keywords: High density polyethylene, nanocomposites, layered double hydroxides, azo dyes, intercalation. IntroduçãoMateriais nanocompósitos poliméricos tiveram o seu descobrimento nos laboratórios de pesquisa da Toyota no Japão (Toyota Central Research Development Laboratories-TCRDL), no início dos anos 90 do século passado [1][2][3] . Primeiramente os materiais utilizados como cargas foram os argilominerais trocadores catiônicos do tipo 2:1, os quais para compatibilização com polímero hidrofóbicos foram submetidos a reações de troca iônica, com cátions de s...

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Compósitos de poli(álcool vinílico) contendo hidroxissais lamelares de zinco, intercalados com corantes aniônicos azo (tropaeolina 0 e tropaeolina 00)

Cited by 5 publications

References 32 publications

Thermal and flammability properties influenced by Zn/Al, Co/Al, and Ni/Al layered double hydroxide in low‐density polyethylene nanocomposites

Thermal and flammability properties influenced by Zn/Al, Co/Al, and Ni/Al layered double hydroxide in low‐density polyethylene nanocomposites

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

Nanocompósitos poliméricos de polietileno de alta densidade contendo hidróxidos duplos lamelares intercalados com anions derivados de corantes azo

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