The effect of TiO2 particles on thermal properties of polycarbonate-based polyurethane nanocomposite films

Pavličević, Jelena; Špírková, Miléna; Aroguz, Ayse Z.; Jovičić, Mirjana; Kojić, Dejan; Govedarica, Dragan; Ikonić, Bojana

doi:10.1007/s10973-019-08750-3

Cited by 13 publications

(19 citation statements)

References 34 publications

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“…The decrease in the intensity of the absorption peak ascribed to the COC asymmetrical stretching registered between 1150 and 1350 cm −1 by silica increment indicates that the interaction between the soft phase and inorganic filler was not achieved (Figure 3B). [ 43 ] This observation is in correspondence with subsequent DSC results. The absorption region registered between 2800 and 3050 cm −1 , attributable to the asymmetrical and symmetrical stretching of CH, was also affected by the presence of SiO 2 (Figure 3C).…”

Section: Resultssupporting

confidence: 90%

Novel waterborne poly(urethane‐urea)/silica nanocomposites

et al. 2020

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A series of novel transparent mechanically strong waterborne poly(urethaneurea)/silica nanocomposites were prepared by mixing a waterborne poly(urethane-urea) dispersion with aqueous nanosilica, followed by slow water evaporation. This procedure is simple, environmentally friendly and energetically undemanding. The silica content in the nanocomposite film varied from 0 to 50 wt%. Based on changes of tensile characteristics, for example, Young's modulus values, three types of behavior were observed: typical elastic (0-10 wt%), plastic (30 wt%) and ceramic-like (50 wt% silica) materials can be prepared. However, some films feature both elastic and plastic (material with 20 wt% silica) or plastic and ceramic-like characteristics (material with 40 wt% silica). The Young's modulus varied from 6 to 705 MPa, and the maximal tensile strength and elongation-at-break were 17.3 MPa and 1270%, respectively. The maximum energy-to-break, 60 mJ mm −3 , was achieved for the film containing 30 wt% silica. All these materials can potentially be used as soft-to-hard topcoats, depending on the specific demands.

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Section: Resultssupporting

confidence: 90%

Novel waterborne poly(urethane‐urea)/silica nanocomposites

et al. 2020

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“…1 H-NMR spectra were acquired on a Varian Unity Plus 400 instrument (Palo Alto, CA, USA) at room temperature, using deuterated chloroform and deuterated DMSO as solvents. All recorded spectra were referenced to the residual solvent signal 7.26 and 2.50 ppm for CDCl 3 and DMSO-d, 6 respectively.…”

Section: Measurementsmentioning

confidence: 99%

“…However, the introduction of nanollers into the polymer matrix is complicated due to the tendency of these reinforcing llers to agglomerate. [5][6][7] To overcome this issue, several strategies have been proposed although their incorporation frequently leads to non-transparent coatings. These drawbacks strongly motivate us to exploit new ways to improve the mechanical properties (strength, toughness) of transparent coatings.…”

Section: Introductionmentioning

confidence: 99%

A novel strategy to polyurethanes with improved mechanical properties by photoactivation of amidocoumarin moieties

Navarro¹,

Seoane-Rivero

Cuevas

et al. 2020

RSC Adv.

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“…In this work, nitrogen was chosen as the inert atmosphere. Namely, previous studies showed that similar systems have significantly higher thermal stability in N 2 than in the air 36 because oxygen affects the breaking down of the polymer chains. The most important thermal F I G U R E 5 Fourier transform infrared spectra of poly(urethane-urea) (PUU) films with different isocyanate excess (5,30, and 40 mol%)…”

Section: Thermogravimetry Analysismentioning

confidence: 99%

“…Thus, the absence of crystalline hard-domain formation was observed for all of the samples, which was also confirmed by the lack of exothermic peak in DSC cooling curves. The glass transition temperature depends mostly on the soft phase component used in the nanocomposite, 36,37 and varied in the temperature range from −43 to −38 C (see Table 5). The variation in the composition may affect the glass transition temperature leading to the shift of approximately 5 C as the isocyanate excess increased from 5% to 40%.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Mechanically strong waterborne poly(urethane‐urea) films and nanocomposite films

Špírková

Pavličević

Costumbre

et al. 2020

J of Applied Polymer Sci

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A series of transparent waterborne poly(urethane-urea) (PUU) films and nanocomposite films were prepared using isocyanate excess (5-50 mol% excess relative to the hydroxyl groups) and omitting the common chain-extension step in the acetone method of the preparation. The surplus isocyanate groups were converted into urea and eventually biuret linkages via the reaction with water during the last phase inversion step. Nanocomposites were prepared by the direct mixing of the PUU nanoparticles in water with aqueous nanosilica or montmorillonite powder followed by slow water evaporation. Variable urea/biuret content is responsible for substantially different tensile properties; the neat organic films show elongation-at-break values of 100%-1120%, tensile strength values of 0.07-22.1 MPa, and energy-to-break of 0.1-85 mJ × mm −3. All of the materials can be potentially used as soft-to-hard topcoats, depending on the specific demands. The most promising materials are films prepared at 30 and particularly 40 mol% isocyanate excess.

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The effect of TiO2 particles on thermal properties of polycarbonate-based polyurethane nanocomposite films

Cited by 13 publications

References 34 publications

Novel waterborne poly(urethane‐urea)/silica nanocomposites

Novel waterborne poly(urethane‐urea)/silica nanocomposites

A novel strategy to polyurethanes with improved mechanical properties by photoactivation of amidocoumarin moieties

Mechanically strong waterborne poly(urethane‐urea) films and nanocomposite films

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