Synthesis and characterization of polyurethane/titanium dioxide nanocomposites obtained by in situ polymerization

Silva, Vinícius Demétrio da; Santos, Leonardo Moreira dos; Subda, Suelen M.; Ligabue, Rosane Angélica; Seferin, Marcus; Carone, Carlos Leonardo Pandolfo; Einloft, Sandra

doi:10.1007/s00289-013-0927-y

Cited by 49 publications

(14 citation statements)

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“…These hydroxyl groups of the SSMMP compete with the hydroxyl groups of the PCL diol, resulting Fig. 2 Overlay IR spectra of the samples: a PU pure; b PU/SSMMP 7 h/3 wt% and c SSMMP 7 h pure in lowering the polymerization yield, and consequently smaller polymer chains when compared to the pure polymer, this behavior was also observed for PU/TiO 2 and PU/talc-Ni nanocomposites [28,35,36].…”

Section: Resultssupporting

confidence: 53%

“…The CO-O group can be identified by the presence of a band in 1243 and 1172 cm -1 . A band in the region of 735 cm -1 corresponds to other vibrational modes of the CH 2 group [35]. Figure 2 also shows the appearance of a band around 1000 cm -1 on the FTIR spectrum of the nanocomposite PU/SSMMP 7 h/3 wt% related to the stretching vibrations of the Si-O-Si bond of the filler proving the incorporation of the SSMMP into the polymeric matrix.…”

Section: Resultsmentioning

confidence: 88%

“…The surface area and the shape play an important role in these properties. For example, a PU/TiO 2 nanocomposite had a maximum increase of 30 % on the Young's Modulus related to pristine PU [35]. Yousfi et al [27] also related a significant increase of 39.4 % on the Young's Modulus in PP/PA6 blends filled with synthetic talc (1880 MPa for the PP/PA6 blends and 2620 MPa with synthetic talc) and our group [28] noticed a maximum increment to the sample of 1 wt% synthetic Ni-talc, which presented an increase of 5.7 % when compared to pure PU.…”

Section: Resultsmentioning

confidence: 98%

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Synthetic silico-metallic mineral particles (SSMMP) as nanofillers: comparing the effect of different hydrothermal treatments on the PU/SSMMP nanocomposites properties

et al. 2015

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Two new synthetic silico-metallic mineral particles like TOT-TOT swelling interstratified (SSMMP) produced with distinct hydrothermal processes (talc 7 h/315°C and talc 24 h/205°C) were used to synthesize polyurethane nanocomposites by in situ polymerization technique. These fillers were added in a range of 0.5-5 wt% related to the mass of the pure polymer. The dispersion and interaction between the fillers and the polymeric matrix were evaluated by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The X-ray analysis indicated that the synthetic SSMMP are well dispersed/or exfoliated into the polymer matrix. The high surface area of the synthetic SSMMP was significant for the increase in the crystallinity and thermal properties of the nanocomposites. In the case of Young's modulus, for nanocomposites PU/SSMMP 24 h and the pristine PU, a similar behavior was observed. However, for the nanocomposites PU/SSMMP 7 h, an increase in the Younǵs modulus values until 3 % of filler addition when compared to pure PU was noticed. The creep-recovery test showed that both SSMMP behave as a mechanical restraint of the polyurethane chains. The results evidenced the importance of the SSMMP syntheses conditions to obtain nanocomposites with desired properties.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 98%

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Synthetic silico-metallic mineral particles (SSMMP) as nanofillers: comparing the effect of different hydrothermal treatments on the PU/SSMMP nanocomposites properties

et al. 2015

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“…The spectra confirm the presence of both PAN and PVDF polymers in the blends, due to the absorption bands at 2242 cm −1 and 1664 cm −1 for the PAN nitrile groups and stretching bands at 1173 cm −1 and 876 cm −1 for the CF 2 and CF PVDF groups [Figure (E)]. In Figure (F), the band at 700 cm −1 is characteristic of the anatase crystalline form . The characteristic peaks of neat PVDF were still maintained.…”

Section: Resultssupporting

confidence: 53%

“…The FTIR spectrum of the PUR nanofiber reveals peaks at 3302 cm −1 (urethane linkage), 2940 cm −1 (asymmetric CH 2 stretching), 2857 cm −1 (symmetric CH 2 stretching), 1720–1730 cm −1 (stretching of free urethane carbonyl groups, urethane CO vibration), 1528 cm −1 (CN and NH bonds of the urethane groups), 1670 cm −1 (urea CO vibration), and 1604 cm −1 [urethane linkage, aromatic v(CC) vibration], as shown in Figure (D) . The spectra confirm the presence of both PAN and PVDF polymers in the blends, due to the absorption bands at 2242 cm −1 and 1664 cm −1 for the PAN nitrile groups and stretching bands at 1173 cm −1 and 876 cm −1 for the CF 2 and CF PVDF groups [Figure (E)].…”

Section: Resultsmentioning

confidence: 98%

Effect of argon plasma treatment on hydrophilic stability of nanofiber webs

Yalçinkaya

2018

J of Applied Polymer Sci

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This paper provides a comprehensive analysis of microwave‐induced low‐vacuum argon plasma treatment effects on the hydrophilic stability of various polymeric nanofiber webs. After plasma modification, samples are kept dry at room temperature in a dark place for the experiments, and the wettability of the nanofibers is improved by plasma treatment. The stability of the plasma‐treated hydrophilic nanofiber webs is observed for 55 days using water contact angle measurements. Different polymeric nanofiber webs show different stability. Based on the contact angle measurements, the surface starts to lose hydrophilicity during the first week after plasma treatment. The structural changes are examined by pore size measurements, scanning electron microscopy, and Fourier transform infrared spectroscopy. Two of the selected nanofiber webs are used as microfilters for separation of oily wastewater with a cross‐flow separation unit to measure the effect of the plasma treatment under wastewater. The permeability and selectivity of the plasma‐treated and untreated samples are compared. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46751.

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