Fábio Roberto Passador

Universidade Federal de São Paulo

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Co-Authors

Larissa Stieven Montagna

Universidade Federal de São Paulo

Luiz Antônio Pessan

Universidade Federal de São Carlos

Mirabel Cerqueira Rezende

Universidade Federal de São Paulo

Guilherme Ferreira de Melo Morgado

Universidade Federal de São Paulo

Eduardo Henrique Backes

Universidade Federal de São Carlos

Erick Gabriel Ribeiro dos Anjos

Universidade Federal de São Paulo

Juliano Marini

Universidade Federal de São Carlos

Thaís Larissa do Amaral Montanheiro

Instituto de Aeronáutica e Espaço

Thaís Ferreira da Silva

Universidade Federal de São Paulo

Natália Ferreira Braga

Universidade Presbiteriana Mackenzie

Cooperative Institutions

Universidade Federal de São Paulo

Universidade Federal de São Carlos

Universidade Estadual Paulista (Unesp)

Universidade de São Paulo

Departamento de Ciência e Tecnologia

Instituto Tecnológico de Aeronáutica

Instituto de Aeronáutica e Espaço

Universidade Federal de Pelotas

Universidade do Vale do Paraíba

Universidade Estadual de Campinas (UNICAMP)

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Fabrication of Biocompatible Composites of Poly(lactic acid)/Hydroxyapatite Envisioning Medical Applications

Polymer Engineering and Science (2020)

Eduardo Henrique Backes Laís de Nóbile Pires César Augusto Gonçalves Beatrice L. Costa Fábio Roberto Passador

Over the last years, orthopedic procedures for bone repairs have been developed due to an increase in trauma and diseases. The development of bioactive composites using biodegradable polymers like poly(lactic acid) (PLA) and bioactive fillers as hydroxyapatite (HA) originate biomaterials, which combine bioactivity of HA and PLA biocompatibility. Therefore, using additive manufacturing is possible for the production of customized products made from these materials; however, a thorough study of these materials is required. In this context, melt‐compounding has been used to manufacture bioactive composites of PLA/HA, and rheological, molecular, and thermomechanical behavior were assessed. The biocomposite of PLA with 10 wt% HA presented a strong shear thinning behavior, which makes it more suitable for fused filament fabrication since lower printing pressure is required. Furthermore, this composite presented an enhancement of 12% in thermomechanical properties in comparison to PLA and a slight increase in cell proliferation. PLA and PLA/HA were fabricated and used to produce 3D calibrations cube as a proof of concept. They presented good printability and high accuracy, and therefore, further investigation needs to be performed to unleash its use in bone tissue engineering applications. POLYM. ENG. SCI., 60:636–644, 2020. © 2020 Society of Plastics Engineers

Compounding

Biocompatibility

Biocomposite

Biocompatible material

Polylactic Acid

Biodegradable polymer

10.1002/pen.25322

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Citations (68)

Reciclagem de bituca de cigarro para obtenção de nanocristais de celulose (NCC)

Even3 Publicações eBooks (2023)

Maria Fernanda Romeu Lino de Souza Fábio Roberto Passador

10.29327/cb-direito-sociologia-politica-antropologia-servico-social-1.599468

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Citations (0)

Influence of blending protocol on the thermal and mechanical properties of HDPE/LLDPE blend-based nanocomposites

AIP conference proceedings (2014)

Fábio Roberto Passador A. Rúvolo‐Filho Luiz Antônio Pessan

The purpose of this work was to investigate the effect of organoclay and compatibilizer agent (LLDPE-g-MA) content on the thermal and mechanical properties for nanocomposites based on a high density polyethylene/linear low density polyethylene blend. The nanocomposites with 2.5, 5.0 and 7.5 wt% of organoclay were produced by melt compounding in a twin-screw extruder. The effect of two blending protocols was also investigated. In the first blending protocol LLDPE and LLDPE-g-MA were first reinforced with organoclay and then this nanocomposite was later blended with HDPE, and the in the second blending protocol LLDPE-g-MA was mixed with organoclay first and then this masterbatch was diluted with HDPE and LLDPE. The nanocomposites were analyzed by WAXD and TEM. The thermal characterization was performed by DSC and DMA, and the mechanical properties were evaluated by tensile properties and three point bending tests. It was shown that the introduction of a maleated compatibilizer was required to improve the organoclay dispersion in the nanocomposite. The addition of organoclay increased the thermal stability and mechanical for all the nanocomposites with respect to the blend. The addition of compatibilizer agent improved the interactions between the organoclay and polymeric matrix and inhibited the mobility of the segments of polymer chains that led to an increase in Tg of the nanocomposites. The organoclay acted as a nucleating agent, increasing the crystallinity with the increase of the level of organoclay. Moreover, the addition of LLDPE-g-MA inhibited the nucleation and/or crystal growth and decreased the crystallinity.

Organoclay

Linear low-density polyethylene

Masterbatch

Thermal Stability

Compounding

High-density polyethylene

10.1063/1.4873781

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Citations (2)

A new use for glassy carbon: Development of LDPE/glassy carbon composites for antistatic packaging applications

Journal of Applied Polymer Science (2018)

Maikon Stefano dos Santos Larissa Stieven Montagna Mirabel Cerqueira Rezende Fábio Roberto Passador

ABSTRACT Antistatic packaging is used for the protection and storage of electronic boards and sensitive electronic components. Different polyolefins can be used for the production of antistatic packaging; however, the accumulation of static electricity in these polyolefins may cause serious damage to the electronic components. In this study, since glassy carbon (GC) has good mechanical properties and electrical characteristics, it was used as an antistatic filler and blended with low‐density polyethylene (LDPE). Composites of LDPE with GC in different proportions were prepared in the molten state using a homogenizer rotating at 3000 rpm. The composites were characterized in terms of thermal, mechanical, structural, and electrical properties. The GC is well dispersed and distributed in the LDPE, which contributed to the formation of a percolated network that enhanced antistatic characteristic. An increase of two orders of magnitudes in the electrical conductivity was obtained for the composite with 0.5 wt % of GC and thus it can be used as antistatic packaging. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47204.

Antistatic agent

Low-density polyethylene

Carbon fibers

Electronic Packaging

10.1002/app.47204

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Citations (31)

In vitro bioactivity and biological assays of porous membranes of the poly(lactic acid) containing calcium silicate fibers

Polymer Bulletin (2019)

Idália A. W. B. Siqueira Suelen Simões Amaral Nayara Koba de Moura João Paulo Barros Machado Eduardo Henrique Backes

Calcium silicate

Simulated body fluid

10.1007/s00289-019-03021-5

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Citations (9)

Morphological, thermal and bioactivity evaluation of electrospun PCL/β-TCP fibers for tissue regeneration

Figshare (2019)

Lilian De Siqueira Fábio Roberto Passador Anderson Oliveira Lobo Eliandra de Sousa Trichês

Abstract Electrospinning is a simple and low-cost way to fabricate fibers. Among the various polymers used in electrospinning, polycaprolactone (PCL) stands out due to its excellent biodegradability and biocompatibility. However, PCL has some limitations such as low bioactivity, hydrophobic surface, and long in vivo degradation. Calcium phosphate ceramics have been recognized as an attractive biomaterial. They are bioactive and osteoinductive, and some are even quite biodegradable. Different contents of particles of beta-tricalcium phosphate (β-TCP) were incorporated in polymer matrix to form fibers of PCL/β-TCP composites by electrospinning for possible application in tissue regeneration. The presence of β-TCP particles promoted some changes in the thermal properties of the fibers. The immersion of PCL/β-TCP 8 wt-% fibers in simulated body fluid (SBF) caused the formation of a denser and homogeneous apatite layer on its surface.

Electrospinning

10.6084/m9.figshare.7865753

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Citations (0)

Hybrids membranes with potential for fuel cells – Part 3: extruded films of nanocomposites based on sepiolite and PC/sulfonated PC blends

Figshare (2018)

Ana Catarina de Oliveira Gomes Eduardo Henrique Backes Adhemar C. Ruvolo Filho Caio Márcio Paranhos Fábio Roberto Passador

Abstract Fuel Cells based in polymers are an alternative for the conventional energetic matrices. However, materials currently available still present disadvantages to overcome. Membranes of polycarbonate (PC)/sulfonated polycarbonate (PCs) blend/sepiolite nanocomposites have previously been studied by the authors, resulting in good mechanical properties and promising properties of vapor transmission and ionic migration resistance. However, their production in large scale is still a challenge. The aim of this work was the development further the formulation and processing of the previously studied material. Films of PC/PCs blends (50/50 wt%) with different content of sepiolite clay, with and without chemical modification, have been prepared in an extruder and evaluated by FTIR, XRD, DSC, TGA, DMA, tension strength and water vapor transmission (WVT). Even after two processing steps, the blend-based nanocomposites keep good thermal and mechanical properties. However, changes in WVT were observed with respect to data obtained in previous studies.

Sepiolite

10.6084/m9.figshare.6318728

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Citations (0)

Fractographic study of thermoplastic composites based on carbon fiber/PA6 conditioned in heated distilled water and saline solution and tested in tensile

Journal of Polymer Research (2023)

Larissa Stieven Montagna Guilherme Ferreira de Melo Morgado Alessandro Guimarães Fábio Roberto Passador Mirabel Cerqueira Rezende

Distilled water

Fractography

10.1007/s10965-023-03826-z

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Citations (1)

Mechanical properties of carbon fiber/PPS laminates processed by hot compression molding under different consolidation cycles

Polymer Composites (2023)

Larissa Stieven Montagna Guilherme Ferreira de Melo Morgado Juliano Marini Alessandro Guimarães Fábio Roberto Passador

Abstract High‐performance thermoplastic composites based on semipregs of poly(phenylene sulfide) (PPS) reinforced with carbon fiber (CF) have been widely used in the aerospace industry due to their excellent mechanical properties and thermal stability. In this work, CF/PPS laminates were processed by hot compression molding. The processing parameters (pressure and temperature of processing) were investigated as well as the effect of the number of semipreg layers. The neat PPS matrix and CF/PPS semipreg were evaluated by rheological and thermal properties, respectively, to verify the best processing temperature for the CF/PPS composite laminates. The CF/PPS laminates obtained were inspected by ultrasound and differential scanning calorimetry analyses, and then the standardized specimens were prepared. The mechanical properties were evaluated by tensile test and interlaminar shear strength (ILSS) tests. Morphological characteristics of fracture surfaces also were analyzed by scanning electron microscopy. The ultrasound inspections showed differences among the processed laminates with the presence of defects mainly around the edges of samples. Based on ultrasound maps, the worst regions of laminates were discharged and not used to cut the specimens utilized in the mechanical characterization. Thermal, mechanical, and morphological analyses of the six laminates processed with different consolidation cycles did not show significant differences, showing good CF‐PPS matrix interface and similar results of crystallization (~23%), tensile strength (776–858 MPa), and ILSS (59–68 MPa).

Compression molding

Consolidation

Thermal Stability

10.1002/pc.27326

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Citations (4)

Influence of MWCNT aspect ratio on the rheological, electrical, electromagnetic shielding, and mechanical properties of polycarbonate melt mixed nanocomposites

Journal of Polymer Research (2023)

Erick Gabriel Ribeiro dos Anjos Tayra Rodrigues Brazil Guilherme Ferreira de Melo Morgado Larissa Stieven Montagna Natália Ferreira Braga

Polycarbonate

Polymer nanocomposite

10.1007/s10965-023-03453-8

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Citations (14)