Efeito da incorporação de talco nas características térmicas, mecânicas e dinâmico-mecânicas de poliuretanos termoplásticos

Amico, Sandro Campos; Freitag, Caroline Pereira da Motta; Riegel, Izabel Cristina; Pezzin, Sérgio Henrique

doi:10.1590/s1517-70762011000100006

Cited by 4 publications

(7 citation statements)

References 15 publications

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“…This behavior is favorable to prevent any kind of defects on the materials and also prevent the creation of stress concentration sites that could start from agglomerated particles, as related in literature [22]. The uniform dispersion of nanoparticles promotes a very large matrix/filler interfacial area, which changes the molecular mobility and for consequence the thermal and mechanical properties of the system [38] as corroborated by our results.…”

Section: Resultssupporting

confidence: 87%

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: 87%

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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“…When natural talc was used as filler, the T onset remains close to that obtained for pure PU. The same result was observed, when talc was added to thermoplastic polyurethanes . These results indicate that the interaction of Ni‐talc by the OH with the urethane group is probably more intense in the nanocomposites with Ni‐talc.…”

Section: Resultssupporting

confidence: 80%

“…From Figures and , it can be highlighted an increase in crystallization temperature of the Ni‐talc nanocomposites with the filler content. This behavior can be explained by the fact that the Ni‐talc having an ordered structure with high specific surface area (BET value of 135 m 2 g −1 ) acts as a nucleating agent, thus facilitating crystallization . Natural talc composites presented a T c similar to pure PU.…”

Section: Resultsmentioning

confidence: 99%

“…The band at 1040 cm −1 and 670 cm −1 are characteristic of the SiO bond. In the regions of 1014 cm −1 and 460 cm −1 bands corresponding to the bond SiOSi, while the bond NiOH appears at 550 cm −1 and 438 cm −1 and the region of 709 cm −1 and 669 cm −1 corresponds to the free OH of the talc structure …”

Section: Resultsmentioning

confidence: 99%

“…The use of natural talc is well known in literature. This filler has been used in the production of composites with different polymeric matrix, such as poly(vinyl alcohol), LLDPE/MWCNT, thermoplastic polyurethane, thermoplastic polyurethane/polypropylene blends, poly(L‐Lactide), polypropylene, poly(lactic acid), among others. Yousfi et al described the use of new synthetic talc as nanofillers reinforcement for polypropylene and polyamide 6 systems and polypropylene/polyamide 6 blends …”

Section: Introductionmentioning

confidence: 99%

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Synthetic Ni‐talc as filler for producing polyurethane nanocomposites

Prado

Dias

Carone

et al. 2014

J of Applied Polymer Sci

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New synthetic Ni-talc was used as filler in the synthesis of polyurethane (PU) nanocomposites by in situ polymerization and to emphasize the contribution of the new material compared with natural talc. Good dispersion of Ni-talc was supported by homogeneous green coloration observed in the polymer matrix. X-ray diffraction (XRD) analyses indicate the intercalation of polymeric matrix into the filler layers by the increase in d 001 -spacing value of the Ni-talc for the nanocomposites when compared to the pristine filler. The nanocomposites obtained with synthetic talc showed an improvement in the crystallization temperature and in thermal stability when compared to pure PU and the composite obtained with natural talc. The young modulus of PU/talc materials containing both Ni-talc and natural talc were slight higher than pure PU. As shown by scanning electron microscope (SEM), Ni-talc fillers were well dispersed into the polymeric matrix probably due to the good compatibility of both phases filler/polymer mainly achieved by the filler OH interaction with the urethane group of the polymeric chain.

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Hybrid Pu/Synthetic Talc/Organic Clay Ternary Nanocomposites: Thermal, Mechanical and Morphological Properties

Dias

Prado

Ligabue

et al. 2018

Polymers and Polymer Composites

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Polyurethane (PU) nanocomposites filled with inorganic particles, aiming at the improvement of mechanical and thermal properties, are well known. Unlike previous work we describe here the combination of two fillers, synthetic talc (silico-metallic mineral particles-SSMMP) with distinct hydrothermal processes (SSMMP 7 h and 24 h) and organically-modified commercial clay (SPR), aiming towards development of new polyurethane ternary nanocomposites by in situ polymerisation. Fillers were added 3 wt.% of the mass of pristine polymer, with a ranging of weight proportions (75:25/25:75) of SSMMP and SPR. Results were compared to those for nanocomposites containing pure SSMMP and SPR fillers. Dispersion degrees and filler interactions with the polyurethane matrix were followed by FTIR, XRD, SEM, TEM and AFM techniques. Results showed that the fillers presented a good dispersion and were exfoliated/ well dispersed in the polyurethane matrix. Thermal and mechanical properties of nanocomposites were evaluated in comparison to the binary nanocomposites (PU/SSMMP 7 h, PU/SSMMP 24 h and PU/ SPR). All nanocomposites presented superior values of Young's modulus to that of pristine PU. Results evidenced that the blend of SSMMP and SPR fillers is an interesting strategy to improve thermal and mechanical properties of nanocomposites.

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Efeito da incorporação de talco nas características térmicas, mecânicas e dinâmico-mecânicas de poliuretanos termoplásticos

Cited by 4 publications

References 15 publications

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

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

Synthetic Ni‐talc as filler for producing polyurethane nanocomposites

Hybrid Pu/Synthetic Talc/Organic Clay Ternary Nanocomposites: Thermal, Mechanical and Morphological Properties

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