TiO 2 /Poly(thiourethane-urethane)-urea nanocomposites: Anticorrosion materials with NIR-reflectivity and high refractive index

Ireni, Nagaraj Goud; Karuppaiah, Murugan; Narayan, Ramanuj; Raju, K. Mohana; Basak, Pratyay

doi:10.1016/j.polymer.2017.05.004

Cited by 29 publications

(33 citation statements)

References 43 publications

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“…The final nanocomposite film, with a thickness of 2.4 µm, kept its transparency in the visible domain and reflected 90% of the IR radiation at 1064 nm. More recently, Ireni et al [226] prepared nanocomposites of Poly(thiourethane-urethane)-urea with titania modified by sulfur-rich hyperbranched polyols. The nanocomposite is presented as transparent, even with a rather high titania loading (up to 5 wt.%), and reflects more than 90% of the NIR wavelengths (Table 10).…”

Section: Infra-red (Ir) Filtering Propertiesmentioning

confidence: 99%

Transparent polymer nanocomposites: An overview on their synthesis and advanced properties

Loste

Lopez‐Cuesta

Billon

et al. 2019

Progress in Polymer Science

246

147

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Since the last decade, there has been an increasing demand for the design of more advanced functional materials. The integration of inorganic nanoparticles to polymer matrices is a powerful tool to confer their fascinating and complementary properties to the polymer materials. Among the different polymer nanocomposites, transparent nanocomposites are of particular interest due to their significance in a wide range of applications. To achieve a high level of transparency in the nanocomposites, it is necessary to minimize the aggregation of the nanoparticles that induce significant light scattering and thus hamper the application for transparent materials. The basic concepts of light scattering, the refractive index modulation and the methods to characterize the transparency of nanocomposites are provided to introduce this review. The fabrication of the Abbreviations: Ag, silver; Al 2 O 3 , alumina; APTMS, (3-Aminopropyl)trimethoxysilane; ATO, antimony-doped tin oxide; Au, gold; CaCO 3 , calcium carbonate; CaF 2 , calcium fluoride; CdS

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Section: Infra-red (Ir) Filtering Propertiesmentioning

confidence: 99%

Transparent polymer nanocomposites: An overview on their synthesis and advanced properties

Loste

Lopez‐Cuesta

Billon

et al. 2019

Progress in Polymer Science

246

147

View full text Add to dashboard Cite

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“…The enhancement of composite properties is conditioned by the homogeneous and complete distribution of the inorganic phase in the organic matrix, which favours the increase in the interfacial surface interactions in tandem with the optimization of the organic-inorganic interactions. However, this goal is more difficult to accomplish, given the inherent immiscibility between the inorganic and organic phases, so extensive research has been devoted to the chemical modification of inorganic nanoparticles to improve the compatibility and implicitly the performance and applications of polyurethane composites [27][28][29]. Titanium dioxide (TiO 2 ) nanoparticles have been frequently incorporated into polymer matrices used for applications in coatings, optical devices, photocatalysis, wastewater treatment or UV shielding due to their excellent chemical stability, optical properties, UV absorption, low cost and environmentally friendly nature [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Aliphatic Polyurethane Elastomers Quaternized with Silane-Functionalized TiO2 Nanoparticles with UV-Shielding Features

Stroea¹,

Chibac-Scutaru²,

Melinte³

2021

Polymers

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The design of high-performance nanocomposites with improved mechanical, thermal or optical properties compared to starting polymers has generated special interest due to their use in a wide range of targeted applications. In the present work, polymer nanocomposites composed of polyurethane elastomers based on polycaprolactone or polycaprolactone/poly(ethylene glycol) soft segments and titanium dioxide (TiO2) nanoparticles as an inorganic filler were prepared and characterized. Initially, the surface of TiO2 nanoparticles was modified with (3-iodopropyl) trimethoxysilane as a coupling agent, and thereafter, the tertiary amine groups from polyurethane hard segments were quaternized with the silane-modified TiO2 nanoparticles in order to ensure covalent binding of the nanoparticles on the polymeric chains. In the preparation of polymer nanocomposites, two quaternization degrees were taken into account (1/1 and 1/0.5 molar ratios), and the resulting nanocomposite coatings were characterized by various methods (Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, contact angle, thermogravimetric analysis, dynamic mechanical thermal analysis). The mechanical parameters of the samples evaluated by tensile testing confirm the elastomeric character of the polyurethanes and of the corresponding composites, indicating the obtaining of highly flexible materials. The absorbance/transmittance measurements of PU/TiO2 thin films in the wavelength range of 200–700 nm show that these partially block UV-A radiation and all UV-B radiation from sunlight and could possibly be used as UV-protective elastomeric coatings.

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“…13,14 As well due to their higher refractive indexes than the polymer matrices, it is possible to obtain polymer nanocomposites with higher indices. 4,15,16…”

Section: Introductionmentioning

confidence: 99%

Obtention of higher refractive index and transparent polymeric nanocomposite systems with small amounts of fillers for lenses application

Menezes

Cavalcante

Vaz

et al. 2020

Journal of Composite Materials

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The development of new materials for obtaining ophthalmic lenses is a subject of great interest due to the great necessity of corrective lenses uses. The application of the lenses based on polymeric material that guarantees greater lightness and less risk of breakage, ensuring greater comfort to users of glasses. The use of nanoparticles in polymer nanocomposites can generate different properties in the final material, mainly when used in hybrid systems in which synergistic effects can be produced. Thus, the present work aimed to evaluate the optical properties of systems with poly(methyl methacrylate) and oxide nanoparticles (silica, zinc, zirconium, and titanium). The systems were characterized in terms of their optical behaviors (refractive index, transmittance, and color change) and mechanical behaviors (nanoindentation, and tensile strength). The results showed that silica-based systems tended to have greater transparency but generate lower refractive indexes. Systems containing zirconia, titanium, and zinc have a higher refractive index and smaller transparency than systems containing silica. Besides, the use of zirconia and titanium increases the nano-hardness and elastic modulus. The results showed that the use of these nanoparticles in binary systems leads to obtaining materials with higher refractive index, greater transparency, and best mechanical behavior. The combination of the nanoparticles also led to a better dispersion, reducing the impact on the color system and improve transparency. In this way, the materials developed using small amounts of fillers and present highly promising for the development of thinner, more resistant to scratching due to high hardness and higher transparent lenses.

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TiO 2 /Poly(thiourethane-urethane)-urea nanocomposites: Anticorrosion materials with NIR-reflectivity and high refractive index

Cited by 29 publications

References 43 publications

Transparent polymer nanocomposites: An overview on their synthesis and advanced properties

Transparent polymer nanocomposites: An overview on their synthesis and advanced properties

Aliphatic Polyurethane Elastomers Quaternized with Silane-Functionalized TiO2 Nanoparticles with UV-Shielding Features

Obtention of higher refractive index and transparent polymeric nanocomposite systems with small amounts of fillers for lenses application

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