Rheological investigation of the melt state elastic and yield properties of a polyamide-12 layered silicate nanocomposite

Aubry, Thierry; Razafinimaro, Tolotrahasina; Médéric, Pascal

doi:10.1122/1.1859791

Cited by 84 publications

(69 citation statements)

References 26 publications

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“…Posteriormente foram feitos experimentos fixando taxas de aquecimento/resfriamento para analisar a influência na formação de ligações cruzadas e mudanças conformacionais, em seguida, foram feitos experimentos com 3 ciclos completos para a formação de rede e sua decomposição sob ação de dois modos de cisalhamento, podendo desta forma serem analisados o grau de ruptura das ligações cruzadas [21,22] . As análises foram feitas com variações de concentração de cloreto de sódio e sulfato de alumínio para concentrações de goma xantana de 0,5 e 1% em peso.…”

Section: Resultados E Discussõesunclassified

Caracterização reológica da goma xantana: influência de íons metálicos univalente e trivalente e temperatura em experimentos dinâmicos

Luporini¹,

Bretas

2011

Polímeros

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Resumo: As propriedades dinâmicas das soluções aquosas de goma xantana com e sem adição de NaCl ou Al 2 (SO 4 ) 3 .18H 2 O foram medidas em um reômetro de deformação controlada aplicando ciclos de aquecimento e resfriamento. O tempo de relaxação decresceu com o aumento da temperatura; no entanto, este tempo aumentou com a adição de sal nas soluções de 0,5% em peso de goma xantana, mas diminuiu com a adição de 1%. Durante o aquecimento das soluções de goma xantana pura ocorreu uma mudança de conformação a 51 °C, e durante o resfriamento foi observada a formação de duas estruturas: entre 86 e 47 °C e abaixo de 47 °C. Com a adição de sal não houve mudança conformacional durante o aquecimento, enquanto no resfriamento duas estruturas foram novamente observadas, mas para faixas de temperatura diferentes. Palavras-chave: Xantana, mudança conformacional, reologia, gel, viscoelasticidade. Rheological Characterization of Xanthan Gum: Influence from Univalent and Trivalent Metallic Ions and From the Temperature in Dynamic ExperimentsAbstract: The dynamic rheological properties of water xanthan gum solutions with and without the addition of NaCl or Al 2 (SO 4 ) 3 .18H 2 O were measured in a strain controlled rheometer applying heating and cooling cycles. The terminal relaxation time decreased with increasing temperature. This time increased with the addition of 0.5 wt. (%) of salt, but decreased when 1 wt. (%) was added. During heating a conformational change occurred at 51 °C and upon cooling two structures were observed between 86 and 47 °C and below 47 °C. When salt was added there was no conformational change during heating, but the two structures again appeared during cooling, though at different temperature ranges.

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Section: Resultados E Discussõesunclassified

Caracterização reológica da goma xantana: influência de íons metálicos univalente e trivalente e temperatura em experimentos dinâmicos

Luporini¹,

Bretas

2011

Polímeros

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“…Most experimental studies on linear viscoelastic behavior of various silicate nanocomposites show the existence of a transition from liquid-like behavior to solid-like behavior at a low silicate mass fraction usually ranging from 2 to 4 wt %. 27 The detailed study of melt rheological properties has highlighted the solid-like behavior of nanocomposites based on PLA and filled from 3 wt % of organically modified montmorillonite. 28 This property has been attributed to the formation of a ''spatially-linked structure'', because of the large aspect ratio of silicate particles.…”

Section: Introductionmentioning

confidence: 99%

Relationship between structure and rheological, mechanical and thermal properties of polylactide/Cloisite 30B nanocomposites

Zaidi

Bruzaud

Bourmaud

et al. 2009

J of Applied Polymer Sci

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Melt-state and solid state mechanical properties and thermal stability of polylactide layered silicate nanocomposites elaborated by melt intercalation were studied as a function of clay content. Wide angle X-ray scattering results, transmission electron microscopy observations, and rheological measurements indicated that the clay was finely distributed in the polylactide matrix. Contrary to nonlinear mechanical properties, thermal and linear mechanical properties were shown to increase with increasing clay fraction. The nanoindentation measurements confirm the significant increase of linear mechanical properties previously observed by tensile tests. The good correlation of linear mechanical properties at the macrometric and nanometric scales is explained by the high dispersion degree of the nanofiller in the biodegradable polymer matrix.

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“…In addition, the rheological behavior of polymer nanocomposites can be correlated with the overall dispersion and exfoliation of nanoplatelets in polymer matrices 21, 24, 25. Although the rheological behaviors of a number of polymer nanocomposite systems have been reported18, 19, 21, 23–37 and related processes have been modeled,38–43 systematic study and modeling have yet to be conducted to establish the structure‐rheology relationship. Thus, a fundamental understanding of the rheological behavior of polymer nanocomposite dispersions for engineering applications is still needed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoplatelets on the Rheological Behavior of Epoxy Monomers

Sun

Boo

Liu

et al. 2009

Macro Materials & Eng

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The effect of nanoplatelets on the rheological behavior of epoxy monomers with variations in nanoplatelet exfoliation level and aspect ratio was investigated. The results show that the presence of exfoliated nanoplatelets in epoxy can significantly influence viscosity and lead to shear‐thinning phenomena, especially when the aspect ratio of the nanoplatelets is high. By employing the Krieger‐Dougherty model, the effectiveness of nanoplatelets in altering epoxy rheological behavior was quantitatively described and compared with experimental findings. Possible physical reasons for the observed rheological behaviors are discussed. The implication of the present study for polymer nanocomposites processing is also addressed.magnified image

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Rheological investigation of the melt state elastic and yield properties of a polyamide-12 layered silicate nanocomposite

Cited by 84 publications

References 26 publications

Caracterização reológica da goma xantana: influência de íons metálicos univalente e trivalente e temperatura em experimentos dinâmicos

Caracterização reológica da goma xantana: influência de íons metálicos univalente e trivalente e temperatura em experimentos dinâmicos

Relationship between structure and rheological, mechanical and thermal properties of polylactide/Cloisite 30B nanocomposites

Effect of Nanoplatelets on the Rheological Behavior of Epoxy Monomers

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