Article
Multidisciplinary Sciences
Demis Cabrera, Haci Baykara, Ariel Riofrio, Mauricio Cornejo, Julio Caceres
Summary: This study examined the use of banana rachis fiber as a reinforcement material in recycled high-density polyethylene matrix. The results showed that the addition of banana rachis fiber improved the properties of the composite materials and reduced the overall environmental impacts.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Applied
Fahanwi Asabuwa Ngwabebhoh, Tomas Saha, Jaroslav Stejskal, Miroslava Trchova, Dusan Kopecky, Jiri Pfleger
Summary: Conducting polymers, particularly polypyrrole, were used for surface modification of three different leathers. The polymer was deposited on collagen fibers, forming a thin layer with thickness ranging from 24 to 200 μm. The modified leathers showed changes in mechanical properties and sheet resistances, and their conductivity and electroactivity can potentially be utilized in intelligent leathers for footwear, heating elements, and energy storage.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Materials Science, Textiles
Elena N. Dresvyanina, Elena Y. Rosova, Natalia Smirnova, Elena M. Ivan'kova, Olga A. Moskalyuk, Irina P. Dobrovolskaya, Andrei N. Aleshin, Vladimir E. Yudin
Summary: The study found that the formation of PPy layers on chitosan fibers can improve electrical conductivity, and the performance of these layers depends on the polymerization conditions. Biocompatibility tests showed that chitosan-PPy composite films contain more viable cells compared to films made from pure chitosan solutions.
TEXTILE RESEARCH JOURNAL
(2022)
Review
Materials Science, Textiles
Yunfan Long, Yongjun Deng
Summary: Carbon fiber paper (CP) was prepared using wet forming technology, and liquid-phase polypyrrole/carbon fiber paper matrix composites (LPPY/CF) and gas-phase polypyrrole/carbon fiber paper matrix composites (GPPY/CF) were prepared by liquid-phase polymerization and gas-phase polymerization on CP, respectively. The effects of dopant, oxidant, solubility of pyrrole (PY) and ferric trichloride (FeCl3) on the resistivity of LPPY/CF and GPPY/CF were discussed. The mechanical properties, hydrophobicity, electrical conductivity, and heating properties of CP, LPPY/CF, and GPPY/CF were compared. The results showed significant improvements in resistivity, mechanical properties, hydrophobicity, electrical conductivity, and heating properties in LPPY/CF and GPPY/CF compared to CP.
FIBERS AND POLYMERS
(2023)
Article
Biochemistry & Molecular Biology
Junfei Xu, Xijun Xu, Cheng Xu, Yabin Jing, Baoqing Shentu
Summary: This study aimed to develop a novel PVDF-based composite using silanized wood powder and micro/nanocellulose fibers, with glycerol serving as a dispersant and a plasticizer. The results demonstrated the effectiveness of utilizing cellulose fibers in biocomposites and the improved mechanical properties of the PVDF/wood composites.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Physical
Chao Feng, Jiaxing Huang, Peihui Yan, Fei Wan, Yunfei Zhu, Hao Cheng
Summary: The research on the application of polypyrrole materials in cement composites shows that adding waterborne polypyrrole can improve conductivity and compactness, optimize microstructure, and inhibit the formation of Ca(OH)2.
Article
Materials Science, Multidisciplinary
Jaroslav Stejskal, Irina Sapurina, Jarmila Vilcakova, Marek Jurca, Miroslava Trchova, Zdenka Kolska, Jan Prokes, Ivo Krivka
Summary: The study fabricated a conductive melamine/polypyrrole/magnetite ferrosponge by depositing polypyrrole on a sponge via the oxidation of pyrrole with iron(III) chloride, followed by treatment with ammonia solution to produce magnetite. The composite sponge was characterized by FTIR spectroscopy for its molecular structure, and its conductivity was found to be dependent on compression. The sponge showed promising performance in electromagnetic radiation shielding in the GHz region, with polypyrrole providing radiation reflection and magnetite contributing to absorption.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Materials Science, Composites
Chingu Kim, Minkook Kim
Summary: A novel composite radar absorbing structure was developed in this study using intrinsically conducting polymer-coated aramid fiber reinforced polymer composites. The research presented the optimal type and composition ratio of the ICPs, as well as key performance parameters of the ICP-coated AFRP RAS. The facile process of ICP coating on the reinforcing fibers will advance the utilization of conducting polymers for radar absorbing structures.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Polymer Science
Jiahua Ma, Xiangyu Chen, Xiaoshuai Sun, Chuanshan Zhao
Summary: The performance of carbon fiber paper was improved by modifying the surface of carbon fibers with dopamine, which increased the proportion of hydrophilic functional groups and improved the bond strength with the adhesive.
Article
Nanoscience & Nanotechnology
Jaroslav Stejskal, Irina Sapurina, Jarmila Vilcakova, Tomas Plachy, Michal Sedlacik, Constantin Bubulinca, Marek Goralik, Miroslava Trchova, Zdenka Kolska, Jan Prokes
Summary: The study successfully designed nanostructured hybrid materials that are both conducting and magnetic, which exhibit high conductivity and saturation magnetization, indicating potential applications.
ACS APPLIED NANO MATERIALS
(2021)
Article
Materials Science, Textiles
Anand Sundararaju Perinbakannan, Muralidharan Karuppusamy, Karuppasamy Ramar
Summary: The study investigated the mechanical and moisture absorption characteristics of hybrid composites made from Indian almond and Banana fibers. The results showed that the I-I-I-I composite exhibited the highest tensile and flexural strength, while the B-B-B-B composite had the highest impact strength and moisture absorption percentage due to its void content.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Textiles
Nasr Bekraoui, Zakaria El Qoubaa, Hajar Chouiyakh, Mustapha Faqir, Elhachmi Essadiqi
Summary: In this study, banana fiber was used in combination with synthetic carbon fiber to reinforce polymer composite materials, and it was found that chemically treated banana fibers improved the mechanical properties of the composite. Further investigation showed that incorporating epoxy into banana fiber composites enhanced the fiber-matrix adhesion and compatibility.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Construction & Building Technology
Mingzheng Zhu, Bing Chen, Meng Wu, Jiaxing Han
Summary: The study aims to prepare cost-effective low-carbon engineered cementitious composites with seawater and sea-sand (SS-ECC) to solve the problem of freshwater and river sand shortage in coastal areas. High-volume of fly ash and silica fume were used to reduce carbon dioxide (CO2) emissions, and hybrid local polyvinyl alcohol (PVA) fibers and basalt (BA) fibers were used to reduce cost. Increasing sea-sand particle size and using 6 mm BA fibers can improve the bending and tensile properties of SS-ECC.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
Siyao Wang, Tahira Pirzada, Wenyi Xie, Eduardo Barbieri, Oindrila Hossain, Charles H. Opperman, Lokendra Pal, Qingshan Wei, Gregory N. Parsons, Saad A. Khan
Summary: We have developed a method to integrate metal-organic frameworks (MOF) onto a fibrous banana paper (BP) substrate made from lignocellulosic biomass. The resulting BP-MOF composites exhibit uniform MOF distribution and enhanced functionalities, with minimal use of organic solvents. The composites demonstrate high surface area, mechanical strength, and antibacterial activity, making them promising for diverse applications.
APPLIED MATERIALS TODAY
(2022)
Article
Polymer Science
Rizwan Ullah, Nadia Khan, Rozina Khattak, Mehtab Khan, Muhammad Sufaid Khan, Omar M. Ali
Summary: The current research focused on the super capacitive behavior of organic conducting polymer, i.e., polypyrrole (PPy) and its composites with gum arabic (GA). The synthesized composites material showed high thermal stability and compact morphology. The electrochemical properties of the composites exhibited impressive specific capacitance and high energy density.
Article
Polymer Science
Camila Mouta Caldas, Bluma Guenther Soares, Tamara Indrusiak, Guilherme Mariz Oliveira Barra
Summary: By modifying PMMA nanocomposites and incorporating GNP with different fluorinated ionic liquids, composites with high thermal stability and conductivity can be obtained, showing excellent absorption properties in terms of microwave absorption.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Mayara C. Bertolini, Sithiprumnea Dul, Guilherme M. O. Barra, Alessandro Pegoretti
Summary: This work focuses on the development of polymeric blends for 3D printing with enhanced electrical and mechanical properties, using PVDF/TPU and CB-PPy materials with high electrical conductivity and mechanical properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Dentistry, Oral Surgery & Medicine
Mario Escobar, Julio C. M. Souza, Guilherme M. O. Barra, Marcio C. Fredel, Mutlu Ozcan, Bruno Henriques
Summary: The combined effect of sulfuric acid etching and acidic adhesive conditioning significantly improved the shear bond strength of PEEK to a resin-matrix composite, demonstrating a synergistic effect between the two methods.
Article
Materials Science, Composites
Joffre Luis Brito Guaricela, Carlos Henrique Ahrens, Guilherme Mariz de Oliveira Barra, Claudia Merlini
Summary: The study found that adding carbon black to the PVDF matrix can improve the mechanical properties of the composite, but exceeding a certain fraction can decrease these properties. Additionally, adding 0.5 wt% of carbon black can significantly increase the electrical conductivity of the composite. Therefore, PVDF/CB composites show potential as raw materials for producing functional components in the SLS process.
POLYMER COMPOSITES
(2021)
Article
Engineering, Chemical
Elias Luiz de Souza, Mateus de Souza Zanzi, Kleber Vieira de Paiva, Jorge Luiz Goes Oliveira, Andre Sampaio Monteiro, Guilherme Mariz de Oliveira Barra, Gabriel Benedet Dutra
Summary: The study investigated the degradation of NBR and EPDM gaskets under similar service conditions, finding that EPDM exhibited a more reliable behavior for gasket and seal applications. Thermo-oxidative aging led to increased compression set for EPDM, while for NBR, diffusion-limited oxidation resulted in heterogeneous oxidation and a crosslinking network near the surface. The presence of a groove reduced side thermo-oxidation and limited oxygen access, affecting the degradation mechanisms of the gaskets.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Jose Carlos Ferreira Junior, Nima Moghimian, Giovanna Gutierrez, Emna Helal, Abdellah Ajji, Guilherme Mariz de Oliveira Barra, Nicole R. Demarquette
Summary: Graphene-based composites show promise in flexible packaging to protect electronic devices, with experimental results indicating a significant reduction in gas permeability at certain G content levels. However, increasing G concentration can lead to deteriorating barrier and mechanical properties. Surface finishing may introduce defects, but these can be prevented through proper design of coextrusion layers.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Camila Aparecida Zimmermann, Giseli Contri, Silvia Daniela Araujo da Silva Ramoa, Luiz Gustavo Ecco, Guilherme Mariz de Oliveira Barra
Summary: This study investigates the anticorrosion properties of a waterborne polyurethane dispersion containing polyaniline and discusses the concept of electrical percolation threshold. The results show that the mixture reaches the electrical percolation threshold at a polyaniline:PSS content of 6%. The coatings prepared below this threshold exhibit good hydrophobicity, adhesion, and electrical properties, while the coatings prepared at or above the threshold show porosity, poor adhesion, and signs of active corrosion. The optimal anticorrosion performance is achieved at a polyaniline:PSS content of 3%.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Materials Science, Multidisciplinary
Maria Ester Cueto Alfaro, Steferson Luiz Stares, Guilherme Mariz de Oliveira Barra, Dachamir Hotza
Summary: This study aims to analyze the effects of accelerated weathering on the mechanical resistance of a poly(lactic acid) scaffold and estimate its shelf life. The results indicate a shelf life of 150 days for the scaffold under specific conditions, with noticeable surface defects appearing after a certain period of accelerated weathering.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Polymer Science
Elias Luiz de Souza, Mateus de Sousa Zanzi, Kleber Vieira de Paiva, Jorge Luiz Goes Oliveira, Guilherme Marizde Oliveira Barra, Gabriel Benedet Dutra
Summary: This study investigates the effects of aging on the physical and mechanical properties of commercially available acrylonitrile-butadiene rubber (NBR) gaskets while maintaining their original geometry. The results showed that longer specimens presented better resistance to thermo-oxidative aging, and limited diffusion oxidation effects promoted non-uniform aging at higher temperatures. The lifetime of the specimens was predicted using compression set as a failure criterion with time-temperature superposition and Arrhenius methods.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Composites
Debora P. Schmitz, Bluma G. Soares, Guilherme M. O. Barra, Leonardo Santana
Summary: Polylactic acid (PLA)-based honeycomb samples with different cell sizes and thickness were prepared using 3D printing technology. These honeycomb structures were used as core components in sandwiched multilayer structures with poly(vinylidene fluoride) (PVDF) and/or PVDF/carbon nanotube (CNT) nanocomposites. The properties of these structures in terms of microwave absorption were investigated, and it was found that the honeycomb design and the presence of an impedance matching layer influenced the results.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
Maria Ester Cueto Alfaro, Steferson Luiz Stares, Guilherme Mariz de Oliveira Barra, Dachamir Hotza
Summary: This study investigates the effects of accelerated weathering on the properties of poly(lactic acid) scaffolds and finds that weathering under controlled temperature, radiation, and humidity has a more pronounced impact on the amorphous parts, while weathering at high temperature affects both the amorphous and crystalline parts.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Polymer Science
Patricia C. Vargas, Claudia Merlini, Sebastien Livi, Johnny de Nardi Martins, Bluma G. Soares, Guilherme M. O. Barra
Summary: The non-covalent modification of CNTs and xGnP with ILs had a significant impact on the PU matrix. The electrical conductivity and EMI SE of the composites were influenced by the loading, dispersion of the fillers, and the nature of IL. Composites with IL105 showed higher electrical conductivity and EMI SE due to better interaction with the PU matrix compared to composites with IL101.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Engineering, Mechanical
Diego Salvaro, Joao Marcos Warmling Dudy, Fabiana de Oliveira Palheta, Cristiano Binder, Aloisio Nelmo Klein, Guilherme Mariz de Oliveira Barra, Jose Daniel Biasoli de Mello
Summary: Improving the energy efficiency of mechanical systems and reducing the usage of lubricant oils and related additives are challenging tasks of the 21st century. The application of tribopolymers, such as PEEK, PAEK, and PTFE, is increasing due to their easy processing and lower density. This study investigates the effects of grinding processes and the incorporation of PTFE on the morphology, composition, and tribological properties of PAEK + PTFE blends.
Article
Engineering, Chemical
Pedro Jacy Santos Diamantino, Mariana Gadelho Gimenez, Lais Duarte, Analucia Gebler Phillippi, Mutlu Ozcan, Guilherme de Siqueira Ferreira Anzaloni Saavedra, Guilherme Mariz de Oliveira Barra, Thais Marques Simek Vega Goncalves
Summary: Polydopamine (PD) coating is not effective in improving the bond strength between gingiva veneering composite and PEKK, and it is time-consuming and reduces adhesion to PEKK.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Chemistry, Analytical
Francielle Crocetta Turazzi, Lucas Mores, Eduardo Carasek, Guilherme Mariz de Oliveira Barra
Summary: Different polyanilines were synthesized and evaluated for the determination of three hormones in urine samples. The optimized extraction conditions and calibration curves were established, and the method showed satisfactory detection and quantification limits, as well as good recoveries and precision. The method was successfully applied to analyze urine samples from female volunteers.
JOURNAL OF SEPARATION SCIENCE
(2023)
