Structure and properties of polyurethane/nanosilica composites

Chen, Yongchun; Zhou, Shuxue; Yang, Haihua; Wu, Limin

doi:10.1002/app.21180

Cited by 156 publications

(113 citation statements)

References 16 publications

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“…PU nanocomposites with colloidal silica and alumina were prepared and their physical properties were studied [12][13][14][15]. The following is a straightforward way of preparation of nanocomposites.…”

Section: Pu-nanosilica Compositesmentioning

confidence: 99%

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Polyurethane Nanocomposites

Khudyakov¹,

Zopf²,

Turro

2009

Designed Monomers and Polymers

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This review describes the present state of science and technology of photopolymerizable (UV-curable) polyurethane (PU) nanocomposites which include nanosilica and organically-modified clay (organoclay). A number of documented improvements of properties of PU nanocomposites compared to the pristine PU are presented. Many data on the structure and properties of PU nanocomposites were obtained not only for UV-cured urethane acrylate oligomers, but also for nanocomposites produced in the dark reactions. These data are critically reviewed. There is an expectation in the field of dramatic improvement of properties of PU nanocomposites under low loading (1-5 wt%) of organoclay.

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Section: Pu-nanosilica Compositesmentioning

confidence: 99%

“…Silica sol can be added to monomers at the stage of polyester preparation by polycondensation [16]. Nanosilica in PU can be prepared by in situ hydrolysis and condensation of silane-terminated oligomers [15]. Note that everything should be done to avoid agglomeration of nanoparticles.…”

Section: Pu-nanosilica Compositesmentioning

confidence: 99%

Polyurethane Nanocomposites

Khudyakov¹,

Zopf²,

Turro

2009

Designed Monomers and Polymers

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“…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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“…However, some properties of WPU still need to be improved further, such as water and solvent resistance, thermal stability, and mechanical properties. The improvements of these properties have been achieved by copolymerizing or grafting of other polymers, external and internal cross-linking, blending or interpenetrating, polymer network formations, and modifying with nanoparticles [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Polydimethylsiloxane and Castor Oil Comodified Waterborne Polyurethane

Zhou

Bao-ling

et al. 2013

ISRN Polymer Science

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In view of both improving properties of waterborne polyurethane (WPU) and sufficient utilization of renewable resources, a series of polydimethylsiloxane (PDMS) and castor oil (C.O.) comodified anionic WPUs with internal cross-linking was prepared through a prepolymer mixing process. The chemical structure of synthesized polymers was characterized by Fourier transforms infrared spectroscopy (FT-IR). In comparison with traditional linear WPU synthesized from petroleum-based polyols, these novel WPU films exhibited superior properties in solvent and water resistance, thermal stability, and mechanical strength, which suggest promising applications of these new environmentally friendly materials, particularly in the area of decorative and protective coatings. In addition, the results showed that with the increase in PDMS content in these co-modified WPUs the average particle size, the water resistance, and the thermal stability increased accordingly while the solvent resistance and the mechanical properties decreased.

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Structure and properties of polyurethane/nanosilica composites

Cited by 156 publications

References 16 publications

Polyurethane Nanocomposites

Polyurethane Nanocomposites

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

Polydimethylsiloxane and Castor Oil Comodified Waterborne Polyurethane

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