Nonisocyanate polyurethane/silica hybrid coatings via a sol–gel route

Hoşgör, Zuhal; Kayaman‐Apohan, Nilhan; Karataş, Sevim; Güngör, Atilla; Menceloǵlu, Yusuf́ Z.

doi:10.1002/adv.20262

Cited by 15 publications

(12 citation statements)

References 29 publications

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“…The sol-gel method has been widely used as an alternative technology in preparing monoliths, powders, coatings and fibers [1][2][3][4]. In recent years, there has been significant interest in preparing continuous inorganic and organic-inorganic hybrid fibers using sol-gel method [5,6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Novel PVA/SiO2-TiO2 Hybrid Fibers

Shi

Song

2014

Fibers

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Hybrid sols of poly (vinyl alcohol) (PVA)/Silicon oxide-titanium oxide (SiO2-TiO2) were prepared with tetraethoxylsilane and tetrabutyl titanate as precursor using Sol-Gel method. PVA/SiO2-TiO2 hybrid fibers were prepared by drawing from the hybrid sols using dip-coating method and aging treatment. The spinnability of hybrid sols was investigated. Spinnable time (t) and spinnable length (l) of hybrid sols increased with either the PVA content or the molar ratio of SiO2 and TiO2. The hybrid fibers were characterized by Fourier transform infrared (FT-IR), Scanning electron microscopy (SEM), X-ray diffraction (XRD), Ultraviolet Visible Spectrometry (UV-Vis) and (Thermo-gravimetric Analysis) TGA. FT-IR results suggested that PVA was linked with (SiO2-TiO2) network by chemical bonds. SEM measurements indicated that when the fibers arrives the maximum spinning length, the diameter of the fibers was about 50 μm, and the whole system was homogeneous. XRD results revealed that the crystallinity of hybrid fibers was decreased distinctly. UV-Vis measurements confirmed that the shielding properties to Ultraviolet (UV) were greatly improved with titania filled in the hybrid fibers. TG measurements suggested that the hybrid fibers show better resistance to heat than pure PVA fibers.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Novel PVA/SiO2-TiO2 Hybrid Fibers

Shi

Song

2014

Fibers

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“…The thermal properties of the compounds were evaluated with a DSC Model Q20 (TA Instruments). The measurements were performed under an inert atmosphere of nitrogen between 285 and 200 C at a heating rate of 10 C min 21 . The heating cycle was performed twice to eliminate the thermal history of the sample.…”

Section: Characterization Of Pu-hybrid Silica Filmsmentioning

confidence: 99%

“…The addition of hybrid silicas to PU has also improved the thermal stability and increased the hydrophobicity . Hosgor et al reported an increase in flame retardancy, modulus and hardness for hybrid silica‐PU composites . Athawale and Kulkarni observed that the addition of silica precursors during the polymer synthesis generated stronger polymer‐silica interactions than those obtained when silica was added after the polymer synthesis.…”

Section: Introductionmentioning

confidence: 99%

“…9,20 Hosgor et al reported an increase in flame retardancy, modulus and hardness for hybrid silica-PU composites. 21 Athawale and Kulkarni observed that the addition of silica precursors during the polymer synthesis generated stronger polymer-silica interactions than those obtained when silica was added after the polymer synthesis. These stronger interactions may confer better properties.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid silica generated In situ in polyurethane‐based composites

Heck

Giacomolli

Livotto

et al. 2014

J of Applied Polymer Sci

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A series of composites of commercial polyurethane (PU) and hybrid silica have been prepared by the sol‐gel process through the in situ synthesis of hybrid silica in a solution of dichloromethane. Mechanical properties, small angle x‐ray scattering (SAXS) and differential scanning calorimetry measurements were performed to evaluate the effects that hybrid silica has on the properties of the resulting PU composites. A series of 13 different organosilane differing in polarity and alkyl chain length has been employed. Compared with pristine PU, composites bearing hybrid silicas were more likely to exhibit reductions in the yield stress and increase in the elongation at break. Samples also showed a negligible variation in the glass transition temperature and a reduction in the ΔCp. The enthalpy of the crystallization process showed a trend towards reduction. Based on the SAXS measurements, the composites showed a small reduction in the interdomain spacing, an increase in the degree of phase separation and a tendency towards reduction in the size of the interphase thickness between domains. These results can be better explained as being caused by the volume of the organic group from the organosilane rather than by the chemical interaction of the organic group with the PU organic moieties. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41157.

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“…The authors also claimed that the hydroxyl groups formed by the aminolysis reactions between cyclic carbonates and amines activated the alkoxysilane hydrolytic condensation (the process of cross-linking). Such approach is indeed a good example of the synergic effect of hybrid materials.Hosgor et al prepared polyhydroxyurethane-silica hybrid coatings via sol-gel routes [144]. First two difunctional cyclic carbonates were obtained from bis(4-glycidyloxy phenyl)phenyl phosphine oxide and poly(propyleneglycol)diglycidyl ether.…”

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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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Nonisocyanate polyurethane/silica hybrid coatings via a sol–gel route

Cited by 15 publications

References 29 publications

Synthesis and Characterization of Novel PVA/SiO2-TiO2 Hybrid Fibers

Synthesis and Characterization of Novel PVA/SiO2-TiO2 Hybrid Fibers

Hybrid silica generated In situ in polyurethane‐based composites

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

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