The effect of nano‐sized silicate layers from montmorillonite on glass transition, dynamic mechanical, and thermal degradation properties of segmented polyurethane

Tien, Y. I.; Wei, Kung Hwa

doi:10.1002/app.11086

Cited by 142 publications

(93 citation statements)

References 39 publications

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“…10 Thermal stability, high gas barrier and flame retardation properties were also observed. [11][12][13][14][15] Clays, which are cheap and abundant in nature, mostly consist of aluminosilicates. They also includes montmorillonite (MMT), vermiculite (VMT), rectorite (REC) and kaolinite clays (KC).…”

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confidence: 99%

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Pamplona¹,

Amoni²,

Alencar³

et al. 2012

J. Braz. Chem. Soc.

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Neste trabalho, investigou-se o efeito da vermiculita e montmorilonita organicamente modificadas (OVMT e OMMT, respectivamente) em ligante asfáltico (AB) modificado por SBS (butadieno-estireno-butadieno). As propriedades físicas e reológicas foram avaliadas para AB, 4,0% SBS MB e nanocompósitos AB modificados por 2,5% SBS com 2,5% de organoargilas. Os ligantes modificados (MB) resultaram no aumento do módulo complexo (G*) e na redução do ângulo de fase (δ), o que significa maior resistência destes à deformação permanente. A viscosidade, penetração e suscetibilidade térmica foram adequadas. Nos diagramas black, observou-se que o efeito da presença das nanoargilas OVMT e OMMT foi semelhante ao efeito da Cloisite ® . As propriedades reológicas dos nanocompósitos foram comparáveis às do 4,0% SBS MB, identificando uma redução de custos, dado o potencial de substituição de polímero pela argila. A presença da OVMT melhorou a estabilidade à estocagem do SBS MB, um resultado importante, visto que a separação de fases é um dos maiores obstáculos ao uso do SBS na pavimentação.In this work, it was investigated the effect of organically modified vermiculite and montmorillonite (OVMT and OMMT, respectively) in asphalt binders (AB) modified by SBS (styrene-butadiene-styrene). The physical and rheological properties were performed for AB, 4.0% SBS MB and nanocomposite AB modified by 2.5% SBS with 2.5% of organoclays. The modified binders (MB) result in the enhancement of complex modulus (G*) and reduction of phase angle (δ), which means greater resistance to permanent deformation. The viscosity, penetration and thermal susceptibility were appropriate. The black diagrams show that the effect of nanoclays OVMT and OMMT was similar to the effect of Cloisite ® . The rheological properties of the nanocomposite were comparable to the 4.0% SBS MB, identifying a cost reduction due to the potential of replacing polymer with clay. The presence of OVMT improved the storage stability of SBS MB, an important result, as the phase separation is a major obstacle to the use of SBS in paving. Keywords: asphalt binder, SBS, montmorillonite, vermiculite, rheology IntroductionPetroleum asphalt has been widely used as binder in road pavements to provide adhesive and protective coating to aggregates. The rheological behavior of a binder is complex, varying from viscous to elastic depending on loading rate and temperature. It has to be fluid enough at high temperature when pumped and mixed with aggregates and has to be stiff enough at service temperature so that, it can resist rutting. In addition, it can not be too stiff in order to avoid thermal cracking. Thus, rheological properties of asphalt binders are of major concern since they are directly related to the field performance.For many years, conventional pure asphalt performed satisfactorily. Due to the increase of traffic loads and also to environmental factors, pure asphalt does not always perform as it is expected. Polymer modified asphalts were developed to overcome distress problems. 1-3 The...

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confidence: 99%

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Pamplona¹,

Amoni²,

Alencar³

et al. 2012

J. Braz. Chem. Soc.

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“…1, there is an occurrence of an absorption band at 1040 cm-1 for PU-MMT, PU-MMT Cu, and PU-MMT Fe. This is an indication of the presence of Si-O bonds due to the incorporation of the clay [12]. The effects of silica nanoparticles on the phase separation of hard and soft segments of membranes are observed through the peaks that are related to the carbonyl group.…”

Section: A Ftir Analysismentioning

confidence: 96%

Gas Permeability Properties of Thermoplastic Polyurethane Modified Clay Nanocomposites

Shamini¹,

Yusoh²

2014

IJCEA

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Abstract-Interest in polymer nanocomposites bloomed over the last decades due to its unusual property improvements. A novel nanocomposite consisting of Na + montmorillonite nanoclay and polyurethane nanocomposite was successfully prepared using solution intercalation method. Nanoclay was modified using transition metal ions which were copper (II) chloride and iron (III) chloride to achieve good dispersion and to reduce clay agglomerations. The modification process proved to be successful through SEM micrographs. Gas permeability test was carried out in a Membrane Separation Testing Unit. Significant improvements in barrier properties were observed with the addition of modified montmorillonite. A remarkable four fold decrease was seen in polyurethane incorporated with 1% modified iron followed by a nearly threefold decrease in polyurethane incorporated with 1% modified copper when tested with oxygen gas. Polyurethane incorporated with 1% modified iron and copper also showed dramatic decreases of 60% and 50% respectively when tested with nitrogen gas.

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“…O segmento rígido se comporta como uma reticulação dispersa na fase flexível e pode ser fundido sem degradação das ligações uretânicas, permitindo o seu processamento como termoplástico [2][3]. Devido às diferentes combinações dos segmentos rígidos e flexíveis podem-se formular materiais com diferentes propriedades, desde macios e flexíveis até duros com alto módulo de elasticidade [4,5]. Nos últimos anos, os compósitos de polímero/nanopartículas têm atraído grande atenção por parte da indústria, uma vez que o uso de argilas como reforço em polímeros resulta normalmente em materiais com excelentes propriedades mecânicas [6].…”

Section: Introductionunclassified

“…Esses compósitos contendo nanoestruturas exibem notável aumento nas propriedades, quando comparados aos compósitos com cargas convencionais, como resistência mecânica, resistência ao calor, permeabilidade a gases e inflamabilidade. Além disso, a incorporação de argilas promove modificações nas propriedades térmicas, relacionadas com a morfologia obtida, como aumento na temperatura de transição vítrea e na estabilidade térmica [4,5].…”

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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The effect of nano‐sized silicate layers from montmorillonite on glass transition, dynamic mechanical, and thermal degradation properties of segmented polyurethane

Cited by 142 publications

References 39 publications

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Gas Permeability Properties of Thermoplastic Polyurethane Modified Clay Nanocomposites

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

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