Studies on the effects of different multiwalled carbon nanotube functionalization techniques on the properties of bio-based hybrid non-isocyanate polyurethane

He, Xin; Xu, Xiaoling; Bo, Guangxu; Yan, Yunjun

doi:10.1039/c9ra08695a

Cited by 50 publications

(22 citation statements)

References 45 publications

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“…As it was mentioned above, the XRD analysis showed no nanotubes in the top layer of the coating. The XRD patterns for the MWCNTs should appear at around 26 • (indexed as 002 reflection of the hexagonal graphite structure) and 43 • (100 graphitic planes) [66,67], but there is a lack of them.…”

Section: Resultsmentioning

confidence: 99%

Surface Properties of Silica–MWCNTs/PDMS Composite Coatings Deposited on Plasma Activated Glass Supports

et al. 2021

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In this paper, we focus on fabrication and physicochemical properties investigations of silica–multiwalled carbon nanotubes/poly(dimethylsiloxane) composite coatings deposited on the glass supports activated by cold plasma. Air or argon was used as the carrier gas in the plasma process. Multiwalled carbon nanotubes were modified with poly(dimethylsiloxane) in order to impart their hydrophobicity. The silica–multiwalled carbon nanotubes/poly(dimethylsiloxane) nanocomposite was synthesized using the sol–gel technique with acid-assisted tetraethyl orthosilicate hydrolysis. The stability and the zeta potential of the obtained suspension were evaluated. Then, the product was dried and used as a filler in another sol–gel process, which led to the coating application via the dip-coating method. The substrates were exposed to the hexamethyldisilazane vapors in order to improve their hydrophobicity. The obtained surfaces were characterized by the wettability measurements and surface free energy determination as well as optical profilometry, scanning electron microscopy, and transmittance measurements. In addition, the thermal analyses of the carbon nanotubes as well as coatings were made. It was found that rough and hydrophobic coatings were obtained with a high transmittance in the visible range. They are characterized by the water contact angle larger than 90 degrees and the transmission at the level of 95%. The X-ray diffraction studies as well as scanning electron microscopy images confirmed the chemical and structural compositions of the coatings. They are thermally stable at the temperature up to 250 °C. Moreover, the thermal analysis showed that the obtained composite material has greater thermal resistance than the pure nanotubes.

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Section: Resultsmentioning

confidence: 99%

Surface Properties of Silica–MWCNTs/PDMS Composite Coatings Deposited on Plasma Activated Glass Supports

et al. 2021

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“…[152,[155][156][157] Multi-wall carbon nanotubes (MWCNTs) were also used to prepare hybrid PHU composites. [158] He et al functionalized MWCNTs with COOH, NH2, Au and Fe3O4 groups.…”

Section: Organic/inorganic Hybrid Phusmentioning

confidence: 99%

Hybrid polyhydroxyurethanes: How to overcome limitations and reach cutting edge properties?

Ecochard

Caillol

2020

European Polymer Journal

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The restrictions on isocyanate substances have encouraged researchers to find alternative methods for the synthesis of Polyurethanes (PUs). New pathways have been designed with focus on non-hazardous and eco-friendly substances. The reaction of cyclic carbonates and amines has appeared as the most promising substitute for the synthesis of Non-Isocyanate Polyurethanes (NIPUs). The obtained Polyhydroxyurethanes (PHUs) have been deeply studied these last decades to offer the best solutions in the substitution of isocyanates in PUs synthesis. Strong efforts have been paid to understand key parameters for the synthesis of PHUs and to design new architectures. However, some limitations in terms of kinetics, conversion and molar masses still remain and impede PHUs expansion. Therefore, this review aims to detail the recent progress that has been made on a new strategy, the hybrid PHUs. The characteristics of additional reactants such as a high reactivity, a low viscosity or the ability to reach higher conversions can be combined with the properties of PHUs in hybrid networks. Other functional groups such as acrylates, methacrylates, epoxies, alkenes or siloxanes give access to new designs and materials with higher performances. Hence, the different strategies to perform hybrid PHUs are discussed and detailed. The main strategies employed are the co-polymerization in one-step, the synthesis of prepolymers with various architectures and the synthesis of organic/inorganic and composite PHUs. Furthermore, a short overview of reprocessable PHUs is given as another outlook for PHU development.

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“…Addition of 20 wt % of cyclic carbonate functional POSS within the PHU formulations increased the cross-linking density and consequently the scratch resistance of the coating. 119 Some other hybrid PHUs have been prepared by combining different chemistries or compounds depending on the final applications of the coatings including ZrO 2 @SiO 2 , 120 γ-Al(OH) 3 , 121 multiwalled carbon nanotubes (MWCNTs), 122 ZnO, 123 or tetraethyl orthosilicate. 124 The dispersion of these fillers within PHU can substantially improve the flame retardancy, 120,121 the mechanical properties, 122 anticorrosion performances, 123 or the UV-weathering 125,126 resistance of the related coatings even at relatively low concentrations (0.5−5 wt %).…”

Section: ■ Introductionmentioning

confidence: 99%

Poly(hydroxyurethane) Adhesives and Coatings: State-of-the-Art and Future Directions

Gomez-Lopez

Panchireddy

Grignard

et al. 2021

ACS Sustainable Chem. Eng.

101

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Polyurethane (PU) adhesives and coatings are widely used to fabricate high-quality materials due to their excellent properties and their versatile nature, which stems from the wide range of commercially available polyisocyanate and polyol precursors. This polymer family has traditionally been used in a wide range of adhesive applications including the bonding of footwear soles, bonding of wood (flooring) to concrete (subflooring), in the automotive industry for adhering different car parts, and in rotor blades, in which large surfaces are required to be adhered. Moreover, PUs are also frequently applied as coatings/paints for automotive finishes and can be applied over a wide range of substrates such as wood, metal, plastic, and textiles. One of the major drawbacks of this polymer family lies in the use of toxic isocyanate-based starting materials. In the context of the REACH regulation, which places restrictions on the use of substances containing free isocyanates, it is now urgent to find greener routes to PUs. While non-isocyanate polyurethanes (NIPUs) based on the polyaddition of poly(cyclic carbonate)s to polyamines have emerged in the past decade as greener alternatives to conventional PUs, their industrial implementation is at an early stage of development. In this review article, recent advances in the application of NIPUs in the field of adhesives and coatings are summarized. The article also draws attention to the opportunities and challenges of implementing NIPUs at the industrial scale.

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Studies on the effects of different multiwalled carbon nanotube functionalization techniques on the properties of bio-based hybrid non-isocyanate polyurethane

Abstract: Different types of surface modification on MWCNTs can affect the thermal stability and water absorption of composites.

Cited by 50 publications

References 45 publications

Surface Properties of Silica–MWCNTs/PDMS Composite Coatings Deposited on Plasma Activated Glass Supports

Surface Properties of Silica–MWCNTs/PDMS Composite Coatings Deposited on Plasma Activated Glass Supports

Hybrid polyhydroxyurethanes: How to overcome limitations and reach cutting edge properties?

Poly(hydroxyurethane) Adhesives and Coatings: State-of-the-Art and Future Directions

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