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, Guilherme Dias, 1 Manoela Prado, p.1

C. Le-roux,

, Rosane Ligabue, 1,3 François Martin, 2 Sandra Einloft, vol.1, p.3

, Pontif ?cia Universidade Cat olica do Rio Grande do Sul (PUCRS), Porto Alegre, Brazil 2 ERT 1074 g eomat eriaux, GET UMR 5563 CNRS, Programa de P os-Graduação em Engenharia e Tecnologia de Materiais (PGETEMA)

, Pontif ?cia Universidade Cat olica do Rio Grande do Sul (PUCRS)

, Synthetic talc manufactured in nano-gel form are interesting because their interaction with water occurs through hydrogen bonding favoring fillers dispersion within the WPU matrix. WPUs are environmental friendly materials because no organic solvents are used in its production. The nanocomposites obtained with the three synthetic talc nano-gel fillers presented a good dispersion even when higher amounts of fillers were added, as seen by X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, and atomic force microscopy analyses. The addition of synthetic talcs improved WPU nanocomposites mechanical properties. Storage and loss modulus results proved fillers incorporation into the WPU matrix corroborating with Fourier transform infrared spectroscopy results. Results demonstrated that synthetic talcs in nano-gel form are interesting to obtain WPU nanocomposites with superior mechanical properties, ABSTRACT: Waterborne polyurethane (WPU) nanocomposites were produced utilizing synthetic talc in gel form in order to improve its physical-chemical properties, vol.135, 2017.

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, J. APPL. POLYM. SCI, 2018.

, Porto Alegre, Brazil 2 Faculdade de Química (FAQUI) -Pontifícia Universidade Católica do Rio Grande do Sul

P. Alegre, 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, 2017.

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