Article
Polymer Science
Clement Freymond, Xavier Mackre-Delannoy, Alain Guinault, Carole Charbuillet, Bruno Fayolle
Summary: The accelerated thermal ageing of ABS films was investigated to determine the cause of their ductile/brittle transition during exposure. Chain scission occurring in the SAN phase was found to be the main process responsible for ABS embrittlement.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Environmental Sciences
Li Xu, Shengcai Li, Youchao Zhang, Wanghu Sun, Longwei Pan, Lei Wang
Summary: This study investigates the pyrolysis behavior of waste plastics. Through experimental analysis and modeling, the kinetic characteristics and reaction mechanism of the pyrolysis process are analyzed and optimized.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Thermodynamics
Alain Alonso, Mariano Lazaro, David Lazaro, Daniel Alvear
Summary: Polymers, including ABS, are widely used in various industries for their mechanical properties, ease of processing, and recyclability. However, ABS often exhibits poorer fire properties compared to other polymers, necessitating the addition of flame retardant additives. This paper presents a comprehensive characterization of ABS through various laboratory tests, comparing the results with literature data to better understand the material's behavior.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Materials Science, Coatings & Films
M. Winnicki, A. Gibas, A. Baszczuk, M. Jasiorski
Summary: The study investigated the deposition mechanism of self-synthesized titanium dioxide powders on ABS polymer by low-pressure cold spraying. It was found that using soft amorphous titanium dioxide agglomerates can reduce erosion of the substrate and provide a satisfactory coating. Additionally, the results showed that the highest deposition efficiency was achieved by using a lower working gas temperature in all types of used powders.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Soran Hassanifard, Kamran Behdinan
Summary: This study examines the ratcheting response of ABS polymer reinforced with graphene nanoplatelets in its filament and 3D-printed forms. The results show that adding a suitable amount of GNPs can increase the fatigue life and reduce the strain ratcheting accumulation of the filament. The ratcheting behavior of the 3D-printed parts is influenced by various factors.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Chemistry, Physical
Mabrouka Akrout, Basma Ben Difallah, Mohamed Kharrat, Maher Dammak, Antonio Pereira, Filipe J. Oliveira, Isabel Duarte
Summary: The purpose of this study was to investigate the properties of novel polymer/metal composite materials for bearing applications. Copper-filled ABS composites were mixed and the dispersion of Cu particles in the matrix was studied. The study concluded that the incorporation of Cu filler improved the friction and wear properties of the composites, making them suitable for a wider range of mechanical components for bearing applications.
Article
Materials Science, Multidisciplinary
Muhammad Miftahul Munir, Aji Insan Kamil, Muzakki Burhanuddin
Summary: This study demonstrates a method for fabricating air filters using waste-ABS, showing high filtration efficiency and a good quality factor. This approach not only effectively treats plastic waste but also can be used in the production of high-performance air filters.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Polymer Science
Angelika Bachinger, Anna Sandinge, Karin M. Lindqvist, Anna Strid, Guan Gong
Summary: The study identified sustainable flame-retardant systems with significant improvement on the fire-retardant properties of ABS. The combination of aluminum diethylphosphinate and ammonium polyphosphate showed superior flame-retardant properties compared to other PFRs and PFR combinations, with promising synergists reducing peak heat release rate and smoke production rate.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Cansu Yildiz, Yoldas Seki, Elif Kizilkan, Mehmet Sarikanat, Lutfiye Altay
Summary: The natural flammability properties of acrylonitrile butadiene styrene (ABS) limit its use in industries. Halogenated additives have traditionally been used to improve the flammability performance of ABS, but their use has been limited due to environmental concerns. In this study, halogen-free flame-retardant additives were used to improve the flame-retardant properties of ABS. The aim was to achieve V0 rating at a thickness of 1.5 mm, LOI value higher than 28%, and a glow wire combustion index of 960 degrees C. The effect of flame retardants on the mechanical, thermal, and morphological properties of ABS was also investigated.
Article
Chemistry, Multidisciplinary
Cansu Yildiz, Yoldas Seki, Elif Kizilkan, Mehmet Sarikanat, Lutfiye Altay
Summary: The study aimed to improve the flame-retardant properties of ABS by using halogen-free flame-retardant additives. ABS-based composites containing AlPi and APP were prepared, aiming to achieve V0 rating, LOI value higher than 28%, and a glow wire flammability index of 960 degrees C.
Article
Engineering, Environmental
Xiaojuan Bai, Ping Liang, Mei Zhang, Shiqiong Gong, Lihua Zhao
Summary: ABS, as one of the most extensively used engineering polymers, was studied for recycling purposes using a torque rheometer. The processing at different temperatures and cycles showed an increase in large size soluble polymeric components, possibly due to crosslinking reactions in grafted polybutadiene. Reprocessing significantly affected the ABS resin, as indicated by chemical analysis after multiple extrusion cycles.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
Article
Materials Science, Composites
Hamidreza Azimi
Summary: In this study, diffusion rates of three gases (CO2, N-2, and normal hexane) in ABS were measured. A diffusion model was proposed to estimate the diffusion coefficients based on the specific volume and chemical potential of the gases. The solubility and diffusivity of the gases in ABS were determined experimentally. The results showed that solubility and diffusivity increased with increasing pressure, and N-2 had the lowest solubility and highest diffusivity in ABS. The proposed model successfully predicted the diffusion coefficients of the gases in ABS.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Syarifa Nur'aini, Akmal Zulfi, Bagas Haqi Arrosyid, Ande Fudja Rafryanto, Alfian Noviyanto, Dian Ahmad Hapidin, Dafit Feriyanto, Kurniawan Eko Saputro, Khairurrijal Khairurrijal, Nurul Taufiqu Rochman
Summary: This study developed a novel method to fabricate electrospun nanofiber membranes (ENMs) for water filtration using waste ABS. The addition of PVP modified the properties of waste ABS and improved the performance of the fabricated fibers. The bilayer of ABS ENMs achieved high flux and rejection rates.
Article
Materials Science, Multidisciplinary
Piyush, Raman Kumar, Ranvijay Kumar, Nishant Ranjan, Jasgurpreet Singh Chohan
Summary: The study demonstrates that the mechanical properties of thermoplastic composite structures can be enhanced using Al metal spray. Through various analytical methods, the optimal parameters were found to be three layers of Al spray, triangular infill printing pattern, and 100% infill density.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Environmental Sciences
Lei Han, Liguo Shen, Hongjun Lin, Zhengyi Huang, Yanchao Xu, Renjie Li, Bisheng Li, Cheng Chen, Wei Yu, Jiaheng Teng
Summary: A functional TiO2-ABS composite membrane was generated through 3D printing for the first time and used for simulated oily water treatment. The membrane showed high hydrophilicity and oleophobicity, as well as high flux and oil rejection rate. The membrane demonstrated over 99% rejection for all five types of oil/water systems, indicating its broad development trend and application prospect.
Article
Energy & Fuels
Leila M. A. Campos, Heloise O. M. A. Moura, Antonio J. G. Cruz, Samira M. N. Assumpcao, Luciene S. de Carvalho, Luiz A. M. Pontes
Summary: The study investigated the effects of SBC and commercial cellulose on enzymatic hydrolysis, and found that SBC had lower crystallinity and higher accessibility, resulting in higher glucose yield. The feedstock and cellulose treatment were found to be major factors influencing the saccharification efficiency, and using SBC achieved higher conversion.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Review
Chemistry, Applied
Alisson Dias da Silva Ruy, Rita Maria de Brito Alves, Thiago Lewis Reis Hewer, Danilo de Aguiar Pontes, Leonardo Sena Gomes Teixeira, Luiz Antonio Magalhaes Pontes
Summary: 1,3-Propanediol (1,3-PDO) is obtained from renewable and environmentally friendly glycerol, with high cost genetically modified microorganisms currently used in industrial production. Studies have shown that platinum, iridium, and copper are the most promising metals, with Brønsted sites responsible for higher selectivity and Lewis sites influencing reaction rates.
Article
Chemistry, Physical
Angelica Amaral de Oliveira, Veronica Lima da Silva, Danilo de Aguiar Pontes, Daniel Freire Almeida, Domingos Sergio Araujo Silva, Jose Marcos Moreira Ferreira, Ronaldo Costa Santos, Ernesto Antonio Urquieta-Gonzalez, Luiz Antonio Magalhaes Pontes
Summary: The generation of mesoporosity in Beta zeolite through desilication promoted an increase in the formation of H2S, indicating the potential of mesoporous HBeta zeolites as additives for reducing sulfur in fluid catalytic cracking catalysts.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Engineering, Chemical
Jilliano B. Silva, Josue S. Almeida, Rodrigo V. Barbosa, Glauber J. T. Fernandes, Ana C. F. Coriolano, Valter J. Fernandes, Antonio S. Araujo
Summary: The study revealed that the thermal and oxidative stability of diesel fuel mixtures decreases as the concentration of biodiesel decreases, emphasizing the need for rapid utilization to avoid degradation and performance issues in vehicles as well as corrosion and clogging in mechanical systems.
Article
Environmental Sciences
Yaime Delgado-Arcano, Dalmo Mandelli, Wagner Alves Carvalho, Luiz Antonio Magalhaes Pontes
Summary: Research focused on the hydrolysis-hydrogenation process of hemicellulose for xylitol production from corncob. Strategies using H-2 gas under pressure and isopropanol as H-2 donor were studied, with the importance of H2SO4 and 5% Ru/C catalyst highlighted. The study found good selectivity in converting xylose to xylitol under mild conditions, eliminating the need for intermediate purification steps.
WASTE AND BIOMASS VALORIZATION
(2021)
Article
Chemistry, Physical
Jordan Gonzaga Andrade Batista Silva, Ronaldo Costa Santos, Enrique Rodriguez-Castellon, Leonardo Sena Gomes Teixeira, Luiz Antonio Magalhaes Pontes
Summary: This study focused on the synthesis of sorbitol using Ru/Nb2O5 catalysts, with better results obtained when using crystalline phase Nb2O5 as a support. Structural modification of the catalytic support positively affected catalyst activity and sorbitol production.
MOLECULAR CATALYSIS
(2021)
Article
Engineering, Chemical
Eduardo Ramos Braga, Rafael Ramos Braga, Luiz Antonio Magalhaes Pontes
Summary: This paper proposes a new process for the production of acrylonitrile using crude glycerol, showing its economic viability and competitiveness compared to the current route. This new route supports the development of further studies in this area.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Laio Damasceno da Silva, Ronaldo Costa Santos, Jordan Gonzaga Andrade Batista Silva, Edson de Paiva Alves, Roger Thomas Francois Frety, Luiz Antonio Magalhaes Pontes
Summary: The study showed that redox phase unpromoted molybdenum catalysts with different loadings had good catalytic effects on the ammoxidation of glycerol, with the best catalyst being 10.0% Mo/gamma-Al2O3, achieving a yield of 26% in nitriles. Increasing molybdenum content, oxidation states, and the amount of weak/moderate acid sites on the support surface are key factors for optimizing the catalysts.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2022)
Article
Chemistry, Physical
Amanda Sayure Kasuya de Oliveira, Antonio Marcelo Silva Lopes, Felipe Fernandes Barbosa, Francisco Ivan da Silva, Jose Antonio de Sousa, Luiz Antonio Magalhaes Pontes, Sibele B. C. Pergher, Tiago Pinheiro Braga
Summary: MgAl2O4 dispersed on HBEA zeolite with different spinel contents were successfully synthesized and their glycerol dehydration performances were presented. The different solids were characterized by various techniques, and it was found that the spinel phase could not be observed in the diffraction patterns, while the reflections of HBEA were evident. Raman and infrared spectra confirmed the presence of the MgAl2O4 spinel. The pore structure and textural properties of zeolite were altered after impregnation, but the micro-mesoporosity was maintained. The addition of spinel changed the acidic properties of HBEA, which improved the catalytic performance.
MOLECULAR CATALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Ana Luiza Freitas Ferreira, Kimberly Paim Abeyta, Jordan Gonzaga Andrade Batista Silva, Ronaldo Costa Santos, Luiz Antonio Magalhaes Pontes
Summary: Glycerol, as a raw material, has applications in various industrial processes, yet its supply exceeds demand. This study investigates the conversion of glycerol into high added-value chemical products by dehydration and hydrogenation reactions, specifically targeting the production of 1,2-PDO and 1,3-PDO. By studying catalysts made of 2% Pt and 10% WO3 supported on SBA-15, the researchers explore the influence of different impregnation methods on the structural and textural properties of the catalysts. The results indicate that co-impregnation provides better dispersion of WO3 species and leads to a greater formation of Bronsted acid sites, while both methods yield catalysts with predominance of Lewis sites.
MATERIA-RIO DE JANEIRO
(2023)
Article
Biotechnology & Applied Microbiology
Eduardo R. Braga, Guilherme J. M. Neto, Rafael R. Braga, Luiz A. M. Pontes
Summary: Due to the increasing global demand for biodiesel, finding new uses for its main by-product, glycerol, has become important. This article focuses on the optimization of the purification stage of glycerol, which is essential for its use in various industrial applications. By using an artificial neural network (ANN) and a genetic algorithm (GA), the optimal number of theoretical stages for vacuum distillation was determined. The results showed that four stages of equilibrium separation were the most economical for industrial-scale distillation columns, providing better performance in terms of glycerol purity. This optimization contributes to the financial viability of using glycerol as a raw material, making processes more cost-effective and adding value to this sustainable by-product.
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2023)
Article
Engineering, Chemical
Diego Santana da Silva, Daniel Freire Almeida, Ronaldo Costa Santos, Jose Marcos Moreira Ferreira, Lam Yiu Lau, Luiz Antonio Magalhaes Pontes
Summary: Sulfur-reducing catalytic additives are used to reduce sulfur compounds in the reaction products. However, these additives can also be deactivated by coke, making it important to study the characteristics of coke in these catalysts. This study investigated the thermoxidation of coke formed on the catalysts by determining the activation energy.
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Review
Engineering, Environmental
Luiggi Cavalcanti Pessoa, Eric Pinheiro Cruz, Kricelle Mosquera Deamici, Bianca Bomfim Andrade, Natalia Santana Carvalho, Suellen Rocha Vieira, Jania Betania Alves da Silva, Luiz Antonio Magalhaes Pontes, Carolina Oliveira de Souza, Janice Izabel Druzian, Denilson de Jesus Assis
Summary: Produced water, the largest effluent generated by the oil exploration and production industries, can be effectively treated through the cultivation of microalgae in microalgae-based biorefineries (MBBs). This review critically explores the challenges and potential benefits of using produced water in MBBs, including identifying barriers to algal growth, the impact of pretreatments on wastewater, supplementation with agro-industrial effluents, and the promising genera of microalgae utilized. Future challenges and directions are categorized to enhance MBBs productivity and promote sustainable competition among oil companies.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Applied
Samira M. N. de Assumpcao, Sirlene B. Lima, Jordan G. A. B. Silva, Ronaldo C. Santos, Leila M. A. Campos, Jose M. Ferreira, Gustavo F. Trindade, Mark A. Baker, Luiz A. M. Pontes
Summary: In this study, the oxidation of HMF to FDCA over Pt catalysts supported on acai coal in an alkaline medium was investigated. The high conversion of HMF and the high yield of FDCA (93.6%) were attributed to the high dispersion of Pt on the support and the presence of oxygenated functional groups on the coal surface.
BIOINTERFACE RESEARCH IN APPLIED CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Karoline de Sousa Castro, Luis Fernando de Medeiros Costa, Valter Jose Fernandes, Regineide de Oliveira Lima, Aruzza Mabel de Morais Araujo, Mikele Candida Sousa de Sant'Anna, Nataly Albuquerque dos Santos, Amanda Duarte Gondim
Summary: The study demonstrates the high efficiency and selectivity of Ni/Al-MCM-41 catalyst in catalytic pyrolysis of palm oil, showing the potential for renewable hydrocarbon production.
