Article
Polymer Science
Tar-Hwa Hsieh, Lin-Chia Ho, Yen-Zen Wang, Ko-Shan Ho, Cheng-Hsien Tsai, Li-Fan Hung
Summary: The hydrophilic initiator potassium persulfate was transformed into a hydrophobic molecule by forming a complex with cetyltrimethylammonium bromide, allowing for inverse emulsion polymerization to take place inside micelles. The resulting iron compound, after calcination, exhibited superparamagnetic properties with a high saturation magnetization, which decreased over time when exposed to the atmosphere.
Article
Chemistry, Multidisciplinary
Maheen Rahim, Sobia Yaseen, Rizwan Ullah
Summary: This study focuses on the fabrication of polyaniline (PANI) and PANI/bismuth-doped zinc oxide (PANI/Bi-ZnO) as electrode materials for high-efficiency supercapacitors. The synthesized materials exhibit improved structural, thermal, and morphological properties, making them suitable for supercapacitor electrodes. The PANI/Bi-ZnO composite shows higher charge storage capacity, energy density, and power density values compared to pure PANI.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Polymer Science
Svitlana Railian, Yasemin Fadil, Vipul Agarwal, Tanja Junkers, Per B. Zetterlund
Summary: The modification of graphene oxide (GO) sheets and their application in emulsion polymerization were explored in this study, showing that stable latexes and nanocomposite films can be successfully obtained using GO and GO-COOH, while encountering colloidal instability when synthesizing GO-PMMA and GO-PDEGA.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Ranganath Wahalathantrige Don, Timothy J. Dowell, Briana L. Simms, Davita L. Watkins, David O. Wipf, Colleen N. Scott
Summary: In this study, a new polymer containing the rhodamine core, polyrhodamine (PRho), was synthesized and its optical and electrochemical properties were determined. The polymer is soluble in polar solvents, with repeat units existing in various forms depending on the pH of the media, affecting its photophysical properties. It exhibits electrochemical reversibility, stability up to 1000 cycles, and impressive conductivity in the semiconductor range when treated with 20% HCl.
Article
Polymer Science
Apoorv Saraswat, Sunil Kumar
Summary: This study focuses on functionalizing polyaniline through organic electrochemistry, by blending it with functional segments of other monomers. Functionalized polyaniline has shown potential in various applications such as chemical sensors and rechargeable batteries. Electrochemical tools play a crucial role in modifying and analyzing the electrochemical properties of polyaniline.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Chemistry, Physical
Hind Hajjaoui, Malika Khnifira, Amal Soufi, Mohamed Abdennouri, Savas Akkaya, Recep Akkaya, Noureddine Barka
Summary: In this study, polyaniline was synthesized using two different methods, and its performance in dye adsorption was evaluated. The relationship between the adsorption properties of polyaniline and its molecular structure was revealed through experimental and computational approaches.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Polymer Science
Asif Raza, Amara Nasir, Mehwish Tahir, Shaista Taimur, Tariq Yasin, Muhammad Nadeem
Summary: Polyaniline grafted conducting nanohybrids were successfully synthesized by emulsion graft polymerization, with sepiolite as an ideal substrate showing excellent thermal stability and electrical conductivity. These nanohybrids exhibited outstanding EMI shielding effectiveness in the X-band frequency range.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Huaixuan Cao, Maria Escamilla, Muhammad Anas, Zeyi Tan, Siddhant Gulati, Junyeong Yun, Kailash Dhondiram Arole, Jodie L. Lutkenhaus, Miladin Radovic, Emily B. Pentzer, Micah J. Green
Summary: This study demonstrates the fabrication of MXene-armored polymer particles using dispersion polymerization in Pickering emulsions, which can be used as feedstocks for MXene/polymer composite films with excellent EMI shielding performance. The presence of nanosheets on the particle surface was confirmed by X-ray photoelectron spectroscopy and scanning electron microscopy, showing the successful templating of an electrical network at low MXene loadings. The resulting Ti3C2Tz/polymer composite films exhibited high electrical conductivity and EMI shielding effectiveness, providing a new approach for MXene/polymer composite films fabrication.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Inorganic & Nuclear
Ramanath Prabhu, Karthika Shetty, T. Jeevananda, H. C. Ananda Murthy, Mika Sillanpaa, Tan Nhat
Summary: Polyaniline-halloysite nanoclay composites (PHC) were successfully prepared through inverted emulsion polymerization technique using benzoyl peroxide (BP) as the oxidizing agent. The FTIR spectra showed vibration bands associated with the stretching of NH, benzenoid, and quinoid rings. The specific conductance of the composites decreased with increasing halloysite nanoclay concentration, while the XRD pattern exhibited peaks at 20.08(0) and 25.34(0). Thermogravimetric analysis indicated improved thermal resistance compared to pure polyaniline. Field emission scanning electron microscopy revealed agglomeration of polyaniline particles and coating on halloysite nanoclay. The AC specific conductance increased due to the formation of bipolar and polarons, while the dielectric constant decreased with increasing frequency. The highest dielectric constant was observed for PHC (70/30) at 10(2) Hz, with a value of 14.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Iqra Abdul Rashid, Ameer Hamza, Siraj Asim, Khadija Zubair, H. M. Fayzan Shakir, Ayesha Afzal, Zakariya Zubair
Summary: The chemical oxidative method was used to synthesize polyaniline (PANI) with APS as an oxidant and formic acid as a dopant. The precipitation of nickel ferrites (NiFe) was achieved using a co-precipitation method. The composites exhibited improved conductivity and magnetic permeability for high electromagnetic interference (EMI) shielding. Various tests were conducted on seven different composites to evaluate their morphology, DC conductivity, EMI shielding, etc. SEM analysis showed uniform dispersion of PANI and NiFe particles in NBR rubber, while DC conductivity increased from 10(-7) S/cm to 286 S/cm. XRD and particle size analysis confirmed the successful fabrication of PANI and NiFe, as well as their respective particle sizes. DSC analysis indicated a decrease in melting point due to the addition of PANI and NiFe in NBR rubber. The composite material achieved an EMI shielding of approximately 52 dB, whereas pure rubber provided only 1-2 dB.
Article
Materials Science, Multidisciplinary
Amara Nasir, Asif Raza, Mehwish Tahir, Tariq Yasin, Muhammad Nadeem, Bashir Ahmad
Summary: This article introduces a novel conducting nanohybrid material prepared by graft polymerization on gamma-irradiated graphene oxide (GO). The results show that the optimal nanohybrid exhibits excellent electrical conductivity and electromagnetic interference shielding effectiveness, demonstrating better performance than the original material.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Polymer Science
Yen-Zen Wang, Yu-Wei Cheng, Lin-Chia Ho, Wen-Yao Huang, Ko-Shan Ho, Yu-Ting Syu
Summary: Oleic acid-modified Fe3O4 nanoparticles were successfully covered with polyanilines through inverse suspension polymerization, resulting in the formation of superparamagnetic ferrite and α''-Fe16N2 mixture at high temperature. The magnetic saturation of the calcined iron-composites slightly decreases after 3 months of storage, but remains relatively high.
Article
Chemistry, Inorganic & Nuclear
N. C. Nepomuceno, A. A. A. Seixas, E. S. Medeiros, T. J. A. Melo
Summary: The study combines cellulose nanocrystals (CNC) and polyaniline through an in situ polymerization of PANI in CNC suspensions to create a nanostructured material. Results show that particle size, thermal stability and polymerization time increase with CNC concentration, indicating that cellulose nanostructure serves as a backbone for PANI deposition. Additionally, the nanostructured PANI/CNC with a higher content of PANI exhibits a conductivity value of 8.9 x 10(-1) S/cm(-1), showing great potential as an alternative nanostructured material compared to neat polyaniline.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Polymer Science
Ignacio Collado, Alberto Jimenez-Suarez, Rocio Moriche, Gilberto Del Rosario, Silvia Gonzalez Prolongo
Summary: This study investigates the influence of the average surface area of different graphene nanoplatelets (GNPs) on the thermo-electrical behavior and electromagnetic signal attenuation of epoxy composites. The results show that the dispersion time and content of GNPs significantly affect the electrical and thermal conductivity of the composites. Furthermore, the shielding effect of different GNPs remains constant within a certain frequency range.
Article
Chemistry, Multidisciplinary
A. Khatun, A. Yadav, S. Zhang, S. Saha
Summary: By in-situ oxidative polymerization of preloaded redox-active monomers, the intrinsically insulating MOF has been transformed into electrically conducting MOF superset of conducting-polymer composites, which could be potentially applied in various porous MOFs to achieve engineered conductivity properties.
MATERIALS TODAY CHEMISTRY
(2022)
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
Polymer Science
Elaine C. Lopes Pereira, Bluma G. Soares, Adriana A. Silva, Guilherme M. O. Barra
Summary: Conducting polymer composites made of PVDF/EVA/CNT were prepared using various melt mixing procedures, with the master batch approach showing positive effects on electrical properties and CNT preferentially localizing in the EVA phase. Increasing CNT content can improve the conductivity of the nanocomposites.
JOURNAL OF APPLIED POLYMER 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)
Article
Polymer Science
Bluma Guenther Soares, Adriana A. Silva, Veronica D. Lima, Deborah N. Barros, Sebastien Livi
Summary: A novel toughened epoxy system cured with anhydride-based hardener was successfully prepared by incorporating nonpolar liquid polybutadiene functionalized with isocyanate groups. The resulting ER-PB-ER triblock copolymer displayed cocontinuous-like morphology and led to a significant improvement in toughness and impact resistance, while also increasing the glass transition temperature of the system. The excellent physic-mechanical performance was attributed to the unique morphology achieved through the addition of the modified polybutadiene.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Katerina Skopalova, Itana Nusa Bubanja, Dragomir Stanisavljev, Nikola Cvjeticanin, Vera Kasparkova, Eliska Dad'ova, Erika Pavlikova, Marek Koutny, Marija Gizdavic-Nikolaidis, Petr Humpolicek
Summary: This study compares the biological properties of PANI prepared by different synthesis methods and oxidizing agents, which improves its potential applications in the biomedical field.
Article
Materials Science, Multidisciplinary
Hui-Ping Li, Cai-Yan Gao, Zhi-Ping Chen, Xin-Heng Fan, Lian-Ming Yang
Summary: In this study, a novel type of D-A non-fused-ring copolymers was designed and synthesized to overcome the trade-off relationship between electrical conductivity and Seebeck coefficient in organic semiconductors. The incorporation of fluorine atoms into the polymer backbone effectively increased the ordered degree of molecular stacking and improved both the electrical conductivity and Seebeck coefficient. The bimodal orientation of polymers played a crucial role in decoupling the correlation between electrical conductivity and Seebeck coefficient.
Article
Materials Science, Multidisciplinary
Mansour A. S. Salem, Amjad Mumtaz Khan, Hatem A. M. Saleh, Khalil M. A. Qasem, Mizna Ahmed, Aadil Shafi Bhat, Abdulaziz Abdullah Qasem Ali, Younes S. A. Ghanem, Ali Alrabie, Abdel-Basit Al-Odayni, Waseem Sharaf Saeed, Basheer Al-Anesi
Summary: This research focuses on the versatile substance, polyaniline/layered double hydroxide (PANI@Nd-Co/LDH), under solvothermal conditions. A thorough analysis of its structure and morphology was conducted using various analytical methods. The findings showed that PANI@Nd-Co/LDH exhibited highly sensitive and specific fluorescence detection of Pb(II) and Al(III), outperforming other heavy metal ions. The sensor demonstrated a turn-off fluorescence response for Pb(II) ions and a turn-on fluorescence response for Al(III) ions. The minimum detectable limits (MDL) were determined to be 9.6 nM for Pb(II) and 220 nM for Al(III). PANI@Nd-Co/LDH could be easily regenerated and reused for multiple cycles. The detection mechanisms involved the inner filter effect (IFE) for Pb(II) and the chelation-enhanced fluorescence (CHEF) effect for Al(III). These results highlight the excellent potential of PANI@Nd-Co/LDH in the detection and recognition of Pb(II) and Al(III) ions.
