المؤلفون: Gabriel Deltrejo Ribeiro, Carlos Toshiyuki Hiranobe, Samara da Silva Araújo, Matheus da Silva Filgueira, José Afonso Rocha, Jefferson Shiguemi Mukuno, Leandra Oliveira Salmazo, Andressa Silva Gomes, Gabrieli Roefero Tolosa, Elmer Mateus Gennaro, Aldo Eloizo Job, Miguel Angel Rodríguez Pérez, Renivaldo José dos Santos

المصدر: Journal of Materials Research and Technology, Vol 30, Iss , Pp 5590-5604 (2024)

مصطلحات موضوعية: Expanded SBR rubber, Leather waste, Sound insulation, Thermal conductivity, Thermal insulation, Mining engineering. Metallurgy, TN1-997

الوصف: In recent years, there has been a growing interest in improving energy efficiency and thermal comfort in low-income housing, especially in regions prone to extreme climatic conditions. Conventional construction materials such as bricks and concrete exhibit shortcomings in energy efficiency, resulting in high indoor temperatures. This scenario not only impacts residents' well-being but also increases energy consumption, especially for air conditioning systems, potentially straining the electrical infrastructure in hot climate areas, leading to power outages and adverse consequences for the community and local industry. This study proposes an innovative and sustainable solution: the use of expanded styrene-butadiene rubber (SBR) with micronized leather shavings, possessing thermal insulation properties. The thermal insulation capacity of the composites was evaluated using heat flow methods, hot/cold plate heat flow analysis, and impedance tube acoustic method. The SBR/Leather waste composite at 20 phr emerges as a viable, promising, and sustainable alternative, exhibiting significant thermal insulation capacity with a thermal conductivity of 0.073 Wm-1.K−1 and temperature attenuation close to 15 °C, potentially enhancing comfort and quality of life in urban areas. The thermal insulation results of the other composites also surpassed traditional construction materials such as building boards, plywood, fiberglass, asphalt roofing, and cement tiles. The study demonstrates the feasibility of reusing leather as a reinforcing filler in rubber-based foams to produce thermal insulation materials, offering a sustainable solution to mitigate urban heating and improve quality of life in cities.

وصف الملف: electronic resource

Relation: http://www.sciencedirect.com/science/article/pii/S2238785424010081; https://doaj.org/toc/2238-7854

URL الوصول: https://doaj.org/article/3936f0318c0f4c6f9142c5ba0e2c1d8b

المؤلفون: Arthur Pimentel De Carvalho, Harison Franca Dos Santos, Gabriel Deltrejo Ribeiro, Carlos Toshiyuki Hiranobe, Danielle Goveia, Elmer Mateus Gennaro, Leonardo Lataro Paim, Renivaldo José Dos Santos

المصدر: Polymers, Vol 16, Iss 4, p 471 (2024)

مصطلحات موضوعية: composites, filler–rubber interaction, Lorenz–Park, polyurethane waste, shoe sole, Organic chemistry, QD241-441

الوصف: This study examined micronized polyurethane residues as a reinforcing filler in elastomeric composites made from natural rubber (NR) and styrene–butadiene rubber (SBR). Due to growing environmental concerns, this research aimed to find sustainable alternatives to synthetic materials. The results indicated that adding micronized polyurethane improved the mechanical properties of the composites, reinforcing the polymer matrix and increasing the cross-link density as a barrier against solvents. The composites met the requirements for industrial applications, though; at 40 phr of polyurethane filler, material deformation was reduced, indicating saturation. FTIR analysis confirmed the homogeneity of the materials without chemical reactions, while electron microscopy revealed an increase in the number of particles and irregularities with the filler. The composite with 10 phr showed a lower volume loss in abrasion resistance, meeting the standards for soles. The composite with 30 phr of polyurethane achieved the best results without the filler’s saturation and met the footwear industry’s requirements. The results show the potential for sustainable practices in industry using this elastomeric blend.

وصف الملف: electronic resource

Relation: https://www.mdpi.com/2073-4360/16/4/471; https://doaj.org/toc/2073-4360

URL الوصول: https://doaj.org/article/66cc66d379424a81a1bcf03ddb8d8d69

المؤلفون: Gabriel Deltrejo Ribeiro, Carlos Toshiyuki Hiranobe, José Francisco Resende da Silva, Giovanni Barrera Torres, Leonardo Lataro Paim, Aldo Eloizo Job, Flávio Camargo Cabrera, Renivaldo José dos Santos

المصدر: Crystals, Vol 12, Iss 11, p 1552 (2022)

مصطلحات موضوعية: NR-CaCO3 composites, vulcanization, crosslink density, mechanical properties, coupling agent, Crystallography, QD901-999

الوصف: In this work investigated the possibility of applying a superficial treatment to ultra-fine calcium carbonate aiming to improve its interaction with the polymer chains of natural rubber so it does not act just as a filler. Commercial processes commonly use 40 phr of Silica as reinforcement filler. Here, we have evaluated the partial replacement of Silica by two types of calcium carbonate into hybrid natural rubber composites, untreated ultra-fine calcium carbonate and with ultra-fine calcium carbonate treated with 2% Chartwell C-515.71HR®. We added calcium carbonate fillers to the composite mixtures (as replacements for commercial silica treated with silane) and studied their influence on the vulcanization process. According to our findings, between 25% and 75% of the silica can be replaced with treated calcium carbonate, and up to 30 parts of CaCO3 can be combined with 100 parts of NR without compromising the properties of the polymer matrix (NR), which generates economic advantages for this industry. Treated calcium carbonate was able to link the inorganic and organic parts of the composite due to its bifunctionality; hence, it can be used as a filler to partially replace silica in hybrid NR composites.

وصف الملف: electronic resource

Relation: https://www.mdpi.com/2073-4352/12/11/1552; https://doaj.org/toc/2073-4352

URL الوصول: https://doaj.org/article/b1d5ad05bc0c4acd93cb54bc4759d748

المؤلفون: Carlos Toshiyuki Hiranobe, Gabriel Deltrejo Ribeiro, Giovanni Barrera Torres, Elton Aparecido Prado dos Reis, Flávio Camargo Cabrera, Aldo Eloizo Job, Leonardo Lataro Paim, Renivaldo José dos Santos

المصدر: Materials Research, Vol 24, Iss suppl 1 (2021)

مصطلحات موضوعية: Natural rubber, cross-linked density, Flory-Rehner, Mooney-Rivlin, NMR, Materials of engineering and construction. Mechanics of materials, TA401-492

الوصف: Abstract This paper investigated the formation of crosslinks in natural rubber compounds in the vulcanization systems: conventional (CV), semi-efficient (SEV), and efficient (EV), processed with three types of accelerators: MBTS (dibenzothiazole disulfide), TMTD (tetramethylthiuram disulfide) and CBS (n-cyclohexyl 2-benzothiazole sulfenamide). The cross-linked densities were determined by organic solvent swelling, dynamic mechanical analysis (DMA), stress vs strain, and low-field nuclear magnetic resonance, the latter being the reference technique for comparison with the other results. It was found that the choice of accelerator type influences the processing time and the cross-linked density of the vulcanizate. The four techniques showed close values of cross-linked density for natural rubber compounds, demonstrating that the analytical techniques studied can be applied to determine cross-linked density.

وصف الملف: electronic resource

Relation: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392021000700214&tlng=en; https://doaj.org/toc/1516-1439

URL الوصول: https://doaj.org/article/bdd0f1a1530a421d920974e0263b72a6

المؤلفون: Gabriel Deltrejo Ribeiro, Aldo Eloizo Job, Vitor Peixoto Klienchen de Maria, Fábio Friol Guedes de Paiva, Carlos Toshiyuki Hiranobe, Flávio Camargo Cabrera, Renivaldo José dos Santos, Leonardo Lataro Paim

المساهمون: Faculdade de Ensino Superior Do Interior Paulista (FAIP), Universidade Estadual Paulista (UNESP), Universidade do Oeste Paulista — UNOESTE, Universidade Estadual de Maringá (UEM)

المصدر: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP

مصطلحات موضوعية: Filler (packaging), Materials science, Polymers and Plastics, Scanning electron microscope, Carbon black, General Chemistry, Condensed Matter Physics, Hybrid fillers, Natural rubber, chemistry.chemical_compound, Calcium carbonate, chemistry, Rheology, visual_art, visual_art.visual_art_medium, Vulcanization, Materials Chemistry, Elongation, Composite material, Dispersion (chemistry), Composites

الوصف: Made available in DSpace on 2022-04-29T08:33:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01 The present research aimed to develop natural rubber hybrid composites reinforced with treated ultrafine calcium carbonate/carbon black (CC/CB). The influence of CC/CB with various filler ratios (50/0, 40/10, 30/20, 20/30, 10/40 and 0/50) on mechanical properties and cure characteristics of the composites was investigated. Also filler reinforcing efficiency was compared aiming to achieve the best ratio for CB partial substitution as compared to composites with CC and CB incorporated separately. The CC30/CB20 composites reached around 17.56 ± 0.3 MPa similar strength at break response compared to CC0/CB50 (16.83 ± 0.6 MPa). Elongation at break increased 48% in relation to CC0/CB50. Hardness maintained similar values compared to high concentration of CB composites. The increase of crosslink density is attributed to a strong interaction between CC and CB and showed a synergism between filler and polymeric matrix in hybrid composites. Scanning electron microscopy studies also reveal a good filler dispersion between filler particles and matrix. The results shown that the new material can be an alternative filler for partial substitution of CB conserving mechanical properties. Faculdade de Ensino Superior Do Interior Paulista (FAIP), Av. Antonieta Altenfelder, 65 - Jardim Santa Antonieta Departamento de Física Química e Biologia Faculdade de Ciências E Tecnologia - FCT/UNESP Universidade do Oeste Paulista — UNOESTE Universidade Estadual de Maringá (UEM), Departamento de Meio Ambiente - Av.Ângelo Moreira da Fonseca, 1800 - Parque Danielle Campus Experimental de Rosana-UNESP Departamento de Física Química e Biologia Faculdade de Ciências E Tecnologia - FCT/UNESP Campus Experimental de Rosana-UNESP

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::415f49862e411630c5b0dc679d529378
https://doi.org/10.1007/s00289-021-03891-8

المؤلفون: Arthur Pimentel de Carvalho, Harison França do Santos, Carlos Toshiyuki Hiranobe, Eduardo Roque Budemberg, Gabriel Deltrejo Ribeiro, Giovanni Barrera Torres, Jose Francisco Resende, Leonardo Lataro Paim, Leandra Oliveira Salmazo, Miguel Ángel Rodríguez Pérez, Renivaldo José dos Santos

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::89356ca7209dac252824a6d8982ca966
https://doi.org/10.22533/at.ed.6842204025

المؤلفون: Harison Franca do Santos, Arthur Pimentel de Carvalho, Carlos Toshiyuki Hiranobe, Eduardo Roque Budemberg, Gabriel Deltrejo Ribeiro, Giovanni Barrera Torres, Jose Francisco Resende, Leonardo Lataro Paim, Leandra Oliveira Salmazo, Miguel Ángel Rodríguez Pérez, Renivaldo José dos Santos

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::7b55e9d20d269eb021cbe0de494fe5df
https://doi.org/10.22533/at.ed.58522280115

المؤلفون: Aldo Eloizo Job, Flávio Camargo Cabrera, Leonardo Lataro Paim, Carlos Toshiyuki Hiranobe, Giovanni Barrera Torres, Gabriel Deltrejo Ribeiro, Elton Aparecido Prado dos Reis, Renivaldo José dos Santos

المصدر: Materials Research v.24 suppl.1 2021
Materials research (São Carlos. Online)
Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
Materials Research, Vol 24, Iss suppl 1 (2021)
Materials Research, Volume: 24 Supplement 1, Article number: e20210041, Published: 23 JUL 2021

مصطلحات موضوعية: Materials science, Sulfenamide, Mooney–Rivlin solid, Analytical chemistry, Tetramethylthiuram disulfide, cross-linked density, law.invention, Stress (mechanics), chemistry.chemical_compound, Natural rubber, law, medicine, General Materials Science, Materials of engineering and construction. Mechanics of materials, Mechanical Engineering, Vulcanization, Dynamic mechanical analysis, Flory-Rehner, Condensed Matter Physics, NMR, chemistry, Mechanics of Materials, visual_art, visual_art.visual_art_medium, TA401-492, Mooney-Rivlin, Swelling, medicine.symptom

الوصف: This paper investigated the formation of crosslinks in natural rubber compounds in the vulcanization systems: conventional (CV), semi-efficient (SEV), and efficient (EV), processed with three types of accelerators: MBTS (dibenzothiazole disulfide), TMTD (tetramethylthiuram disulfide) and CBS (n-cyclohexyl 2-benzothiazole sulfenamide). The cross-linked densities were determined by organic solvent swelling, dynamic mechanical analysis (DMA), stress vs strain, and low-field nuclear magnetic resonance, the latter being the reference technique for comparison with the other results. It was found that the choice of accelerator type influences the processing time and the cross-linked density of the vulcanizate. The four techniques showed close values of cross-linked density for natural rubber compounds, demonstrating that the analytical techniques studied can be applied to determine cross-linked density.

وصف الملف: text/html

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::397be2149d4c5b7ca752c065f08c4bf0
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392021000700214