Synthesis and characterization of elastomeric polyurethane/clay nanocomposites

Ma, Jisheng; Zhang, Shufan; Zhang, Qi

doi:10.1002/app.1982

Cited by 147 publications

(90 citation statements)

References 7 publications

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“…However, processing is usually not the focal point of these studies [7][8][9] and normally not investigated systematically. Furthermore, the processing for elastomeric systems tends to be less complex than the more reactive rigid PU systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of different preparation routes on the structure and properties of rigid polyurethane‐layered silicate nanocomposites

Woo

Halley

Martin

et al. 2006

J of Applied Polymer Sci

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To identify the effect of reactive preparation on the structure and properties of rigid polyurethane (PU)-layered silicate nanocomposite, a range of nanocomposites were prepared by combining the various precursors in different sequences. The morphology of the samples was characterized by XRD and TEM. Tensile properties and dynamic mechanical thermal properties were measured. The reactions between the layered silicates and PU precursors were monitored via FTIR to gain an understanding of the participation of nanofiller in the polymerization reaction, and the impact of this on system stoichiometry. The XRD and TEM results provided evidence that morphology can differ significantly if different synthesis methods are used. However, the mechanical properties are dominated by the stoichiometry imbalance induced by the addition of the layered silicates.

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Section: Introductionmentioning

confidence: 99%

Effect of different preparation routes on the structure and properties of rigid polyurethane‐layered silicate nanocomposites

Woo

Halley

Martin

et al. 2006

J of Applied Polymer Sci

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“…8 In a previous paper, we reported the use of ultrasound to aid the exfoliation of organically modified montmorillonite (OMMT) in low molar mass poly(propylene glycol). 9 It was shown that in low viscosity media, high shear by itself may not be sufficient to achieve exfoliation.…”

Section: Introductionmentioning

confidence: 99%

Study of the factors influencing the exfoliation of an organically modified montmorillonite in methyl methacrylate/poly(methyl methacrylate) mixtures

McAlpine

Hudson

Liggat

et al. 2005

J of Applied Polymer Sci

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The factors that affect the dispersion of exfoliated organically modified montmorillonite in a solution of poly(methyl methacrylate) in methyl methacrylate are explored. Exfoliation of montmorillonite in the solution is achieved with the assistance of ultrasound, and rheological measurements indicate a very significant increase in the viscosity, a dramatic shear thinning behavior, and a finite yield stress, all of which are direct consequences of the exfoliated state of the clay platelets. A number of factors, including the sonication power, clay loading, use of a swelling agent, and moisture content of the modified montmorillonite, are found to influence the exfoliation process. The effect of addition of a range of titanate coupling agents (LICA-01, 12, 38, 44, and 97) on the viscosity of the nanoclay dispersions was investigated. It was found that LICA-44 had the effect of reducing the viscosity of the exfoliated montmorillonite dispersion without apparently influencing the extent of the exfoliation. Molecular modeling, UV-visible and Fourier transform infrared spectrometry were used to investigate the possible reasons for efficacy of this LICA. The LICA appears to act through a combination of steric effects and the presence of certain charges on the organic molecule. The magnitude of the negative charges on elements of the LICA appears to influence its ability to bind to the clay and also its ability to reduce the viscosity of the nanoclay. This article indicates how the apparently conflicting requirements of achieving a highly exfoliated state and also maintaining a viscosity low enough for processing can be effectively addressed

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“…No espaçamento interplanar d = 1,5 nm, um pico foi observado somente no TPU 10%, provavelmente devido ao excesso de argila nesse compósito, e consequentemente uma pobre dispersão. Em outros dois trabalhos citados na literatura, a dispersão decai com o aumento do teor de argila na matriz polimérica [16,22]. Na Figura 3 são apresentados os resultados de microscopia eletrônica de varredura e de mapeamento do silício, obtido por microanálise por energia dispersiva para as amostras TPU 1% (Figura 3a), TPU-E 3% (Figura 3b) e TPU 10% (Figura 3c).…”

Section: Materiaisunclassified

“…Os compósitos de TPU/nanopartículas podem ser obtidos através de polimerização em massa [7][8][9][10][11][12], polimerização em solução [13], incorporação em extrusora [14,15] e extrusão reativa [16]. De acordo com a literatura, os compósitos de TPU com a argila Cloisite® 30B (C30B) são os que apresentam os melhores resultados com relação às propriedades mecânicas quando comparadas às demais nanopartículas [6-11, 14, 15, 17].…”

Section: Introductionunclassified

Mechanical and Thermal Properties and Morphology of Thermoplastic Polyurethane (TPU)/Clay Composites

et al. 2015

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ResumoNeste trabalho, compósitos de elastômero termoplástico de poliuretano (TPU) foram preparados com diferentes teores de argila (1, 3 e 10% m/m). A argila Cloisite  30B (C30B) foi incorporada na matriz de TPU via processamento por fusão em uma extrusora de dupla rosca. O método de síntese do TPU foi a polimerização em duas etapas do poliol poliéster e do di-isocianato de 4,4' difenil metano com butano-1,4-diol como extensor de cadeia. A dispersão da argila e seu efeito sobre as propriedades mecânicas e térmicas dos compósitos foram investigadas. A caracterização dos compósitos de TPU com argila foi realizada por meio das análises de microscopia eletrônica de varredura, microanálise de energia dispersiva e difração de raios X. As propriedades mecânicas foram avaliadas através da resistência à tração. O TPU com 3% m/m de argila apresentou os melhores resultados com aumento nos valores de tensão e alongamento na ruptura (28% e 35%, respectivamente), quando comparado ao TPU puro (amostra sem argila). As análises de calorimetria diferencial de varredura e termogravimetria, para os compósitos, indicaram que a argila não afetou significativamente as temperaturas de transição vítrea, de fusão e de degradação da matriz polimérica, mas restringe o movimento molecular. Palavras-chavePoliuretano, Argila, Compósitos, Morfologia, Propriedades Mecânicas, Propriedades Térmicas Mechanical and Thermal Properties and Morphology of Thermoplastic Polyurethane (TPU)/Clay CompositesAbstract In this study, thermoplastic polyurethane (TPU) composites were prepared with different nanoclay contents (1, 3 and 10 wt%). The nanoclay Cloisite  30B (C30B) was dispersed in the TPU matrix by melt processing using a twin-screw extruder. The synthesis method of TPU involved the two-step bulk polymerization of polyesterpolyol and 4,4' diphenylmethanediisocyanate with butane-1,4-diol as the chain extender. The dispersion of the nanoclay particles and its effect on the mechanical and thermal properties of the composites was investigated. The characterization of TPU/nanoclay composites was carried out by means of scanning electron microscopy, energy dispersion microanalysis and X ray diffraction. The mechanical characterization was performed through determination of the tensile strength. The TPU 3 wt% composite showed the best improvement with increases in stress and tensile at break (28% and 35%, respectively), compared to the neat TPU (sample without nanoclay). The differential scanning calorimetry and thermogravimetry analyses for composites indicated that the nanoclay did not affect significantly the glass transition, melt, and degradation temperatures of the polymeric matrix, but reduces the molecular mobility.

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Synthesis and characterization of elastomeric polyurethane/clay nanocomposites

Cited by 147 publications

References 7 publications

Effect of different preparation routes on the structure and properties of rigid polyurethane‐layered silicate nanocomposites

Effect of different preparation routes on the structure and properties of rigid polyurethane‐layered silicate nanocomposites

Study of the factors influencing the exfoliation of an organically modified montmorillonite in methyl methacrylate/poly(methyl methacrylate) mixtures

Mechanical and Thermal Properties and Morphology of Thermoplastic Polyurethane (TPU)/Clay Composites

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