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M. P. Oliveira
Forest and Wood Sciences Department, Federal University of Espírito Santo, Jeronimo Monteiro 29550-000, Brazil

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Journal article
Published: 05 June 2021 in Polymers
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In a recent paper, novel polyester nanocomposites reinforced with up to 3 wt% of cellulose nanocrystals (CNCs) extracted from conifer fiber were characterized for their crystallinity index, water absorption, and flexural and thermal resistance. The use of this novel class of nanocomposites as a possible substitute for conventional glass fiber composites (fiberglass) was then suggested, especially for the 1 and 2 wt% CNC composites due to promising bending, density, and water absorption results. However, for effective engineering applications requiring impact and tensile performance, the corresponding properties need to be evaluated. Therefore, this extension of the previous work presents additional results on Izod and tensile tests of 1 and 2 wt% CNC-reinforced polyester composites, together with a comparative cost analysis with fiberglass. The chemical effect caused by incorporation of CNCs into polyester was also investigated by FTIR. In comparison to the neat polyester, the Izod impact energy increased 50% and 16% for the 1 and 2 wt% composites, respectively. On the other hand, the tensile strength and Young’s modulus remained constant within the ANOVA statistical analysis. FTIR analysis failed to reveal any chemical modification caused by up to 2 wt% CNC incorporation. The present impact and tensile results corroborate the promising substitution of a polyester composite reinforced with very low amount of CNCs for common fiberglass in engineering application.

ACS Style

Grazielle Maradini; Michel Oliveira; Lilian Carreira; Damaris Guimarães; Demetrius Profeti; Ananias Dias Júnior; Walter Boschetti; Bárbara Oliveira; Artur Pereira; Sergio Monteiro. Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension. Polymers 2021, 13, 1878 .

AMA Style

Grazielle Maradini, Michel Oliveira, Lilian Carreira, Damaris Guimarães, Demetrius Profeti, Ananias Dias Júnior, Walter Boschetti, Bárbara Oliveira, Artur Pereira, Sergio Monteiro. Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension. Polymers. 2021; 13 (11):1878.

Chicago/Turabian Style

Grazielle Maradini; Michel Oliveira; Lilian Carreira; Damaris Guimarães; Demetrius Profeti; Ananias Dias Júnior; Walter Boschetti; Bárbara Oliveira; Artur Pereira; Sergio Monteiro. 2021. "Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension." Polymers 13, no. 11: 1878.

Journal article
Published: 28 November 2020 in Polymers
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The application of cellulose nanocrystal has lately been investigated as polymer composites reinforcement owing to favorable characteristics of biodegradability and cost effectiveness as well as superior mechanical properties. In the present work novel nanocomposites of unsaturated polyester matrix reinforced with low amount of 1, 2, and 3 wt% of cellulose nanocrystals obtained from conifer fiber (CNC) were characterized. The polyester matrix and nanocomposites were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), bending test, and thermogravimetric analysis (TGA). The result showed that the addition of only 2 wt% CNC increased the nanocomposite flexural strength by 159%, the ductility by 500% and the toughness by 1420%. Fracture analyses by SEM revealed a uniform participation of the CNC in the polyester microstructure. The resistance to thermal degradation of the CNC reinforced nanocomposites was improved in more than 20 °C as compared to neat polyester. No significant changes were detected in the water absorptions and XRD pattern of the neat polyester with incorporations up to 3 wt% CNC. These results reveal that the 2 wt% CNC nanocomposite might be a promising more ductile, lightweight and cost-effective substitute for conventional glass fiber composites in engineering applications.

ACS Style

Grazielle Da Silva Maradini; Michel Picanço Oliveira; Gabriel Madeira Da Silva Guanaes; Gabriel Zuqui Passamani; Lilian Gasparelli Carreira; Walter Torezani Neto Boschetti; Sergio Neves Monteiro; Artur Camposo Pereira; Bárbara Ferreira De Oliveira. Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals. Polymers 2020, 12, 2838 .

AMA Style

Grazielle Da Silva Maradini, Michel Picanço Oliveira, Gabriel Madeira Da Silva Guanaes, Gabriel Zuqui Passamani, Lilian Gasparelli Carreira, Walter Torezani Neto Boschetti, Sergio Neves Monteiro, Artur Camposo Pereira, Bárbara Ferreira De Oliveira. Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals. Polymers. 2020; 12 (12):2838.

Chicago/Turabian Style

Grazielle Da Silva Maradini; Michel Picanço Oliveira; Gabriel Madeira Da Silva Guanaes; Gabriel Zuqui Passamani; Lilian Gasparelli Carreira; Walter Torezani Neto Boschetti; Sergio Neves Monteiro; Artur Camposo Pereira; Bárbara Ferreira De Oliveira. 2020. "Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals." Polymers 12, no. 12: 2838.

Original
Published: 01 January 2020 in European Journal of Wood and Wood Products
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The production of charcoal for its many uses requires a careful selection of biomass and pyrolysis conditions, especially temperature, to ensure suitable quality. To do so, physical, chemical, and mechanical energy must be considered. This study aimed to analyze the yields and properties of charcoal produced at different pyrolysis temperatures. Eucalyptus saligna wood was pyrolyzed in a reactor with final temperatures of 450, 550, 650, 750, 850 and 950 °C. The yields of charcoal, pyroligneous liquid and non-condensable gases were determined. Mass loss was determined for each temperature. Charcoal analysis included the determination of the apparent density, proximate analysis, heating value, mechanical strength, X-ray images for the internal visualization of its structure and hygroscopicity test. Relevant charcoal properties for the steel industry and barbecue, such as density, mechanical strength, heating value and hygroscopicity, show variable trends from pyrolysis at 650 °C. The results show that pyrolysis temperature had a great impact on the properties of charcoal. The apparent density of charcoal rose from 500 °C and had no relation to the breaking strength. When the pyrolysis temperature was raised, an increase in both apparent and true densities, internal fissures and cracks and fixed carbon content of charcoal was observed.

ACS Style

Ananias Francisco Dias Junior; Rosi Pompeu Esteves; Álison Moreira Da Silva; Aécio Dantas Sousa Júnior; Michel Picanço Oliveira; José Otávio Brito; Alfredo Napoli; Benone Magalhães Braga. Investigating the pyrolysis temperature to define the use of charcoal. European Journal of Wood and Wood Products 2020, 78, 193 -204.

AMA Style

Ananias Francisco Dias Junior, Rosi Pompeu Esteves, Álison Moreira Da Silva, Aécio Dantas Sousa Júnior, Michel Picanço Oliveira, José Otávio Brito, Alfredo Napoli, Benone Magalhães Braga. Investigating the pyrolysis temperature to define the use of charcoal. European Journal of Wood and Wood Products. 2020; 78 (1):193-204.

Chicago/Turabian Style

Ananias Francisco Dias Junior; Rosi Pompeu Esteves; Álison Moreira Da Silva; Aécio Dantas Sousa Júnior; Michel Picanço Oliveira; José Otávio Brito; Alfredo Napoli; Benone Magalhães Braga. 2020. "Investigating the pyrolysis temperature to define the use of charcoal." European Journal of Wood and Wood Products 78, no. 1: 193-204.

Article
Published: 15 July 2019 in Environment, Development and Sustainability
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The objective of this research was to evaluate the Anadenanthera peregrina wood cultivated in five spacing and pyrolyzed in two different heating rates. Three trees were collected from each spacing (3 × 2, 3 × 3, 4 × 3, 4 × 4 and 5 × 5 m), and samples were taken for the determination of the physical and chemical properties of the wood, the pyrolysis under the two heating rates (1.67 and 0.83 °C min−1) and the subsequent analysis of the charcoal produced. Planting spacing did not influence the properties of A. peregrina wood. The heating rate influenced the charcoal properties, interacting with the spacing for the ash content and apparent density, yields of pyroligneous liquid and non-condensable gases.

ACS Style

C. O. Souza; J. G. M. Silva; M. D. C. Arantes; G. B. Vidaurre; A. F. Dias Júnior; M. P. Oliveira. Pyrolysis of Anadenanthera peregrina wood grown in different spacings from a forest plantation in Brazil aiming at the energy production. Environment, Development and Sustainability 2019, 22, 5153 -5168.

AMA Style

C. O. Souza, J. G. M. Silva, M. D. C. Arantes, G. B. Vidaurre, A. F. Dias Júnior, M. P. Oliveira. Pyrolysis of Anadenanthera peregrina wood grown in different spacings from a forest plantation in Brazil aiming at the energy production. Environment, Development and Sustainability. 2019; 22 (6):5153-5168.

Chicago/Turabian Style

C. O. Souza; J. G. M. Silva; M. D. C. Arantes; G. B. Vidaurre; A. F. Dias Júnior; M. P. Oliveira. 2019. "Pyrolysis of Anadenanthera peregrina wood grown in different spacings from a forest plantation in Brazil aiming at the energy production." Environment, Development and Sustainability 22, no. 6: 5153-5168.

Articles
Published: 01 March 2019 in CERNE
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The objective of this study was to evaluate the thermal decomposition profile of 10 wood species from the semi-arid region of Brazil using thermogravimetric analysis (TGA) to investigate their potential as biomass energy sources. First, flash carbonization was carried out in a muffle furnace, in which wood samples were heated to a maximum temperature of 500°C, and the product yields were determined. The chemical analysis of the wood of each species for the determination of extractive, lignin and ash contents was performed. TGA was performed using sawdust samples heated at 10°C.min−1 up to 625°C under a nitrogen atmosphere at a flow rate of 50 mL.min−1. The thermal decomposition profile was used to evaluate which wood species was more thermally stable. Mimosa tenuiflora and Poincianella pyramidalis woods were the most suitable as biomass energy sources for charcoal production because of their thermal stability and satisfactory carbonization yields. The thermal stability of the 10 wood samples was confirmed by the analysis of the carbonization yields.

ACS Style

Ananias Francisco Dias Júnior; Carlos Rogério Andrade; Thiago De Paula Protásio; José Otávio Brito; Paulo Fernando Trugilho; Michel Picanço Oliveira; Graziela Baptista Vidaurre Dambroz. THERMAL PROFILE OF WOOD SPECIES FROM THE BRAZILIAN SEMI-ARID REGION SUBMITTED TO PYROLYSIS. CERNE 2019, 25, 44 -53.

AMA Style

Ananias Francisco Dias Júnior, Carlos Rogério Andrade, Thiago De Paula Protásio, José Otávio Brito, Paulo Fernando Trugilho, Michel Picanço Oliveira, Graziela Baptista Vidaurre Dambroz. THERMAL PROFILE OF WOOD SPECIES FROM THE BRAZILIAN SEMI-ARID REGION SUBMITTED TO PYROLYSIS. CERNE. 2019; 25 (1):44-53.

Chicago/Turabian Style

Ananias Francisco Dias Júnior; Carlos Rogério Andrade; Thiago De Paula Protásio; José Otávio Brito; Paulo Fernando Trugilho; Michel Picanço Oliveira; Graziela Baptista Vidaurre Dambroz. 2019. "THERMAL PROFILE OF WOOD SPECIES FROM THE BRAZILIAN SEMI-ARID REGION SUBMITTED TO PYROLYSIS." CERNE 25, no. 1: 44-53.