Article
Chemistry, Physical
Jing Li, Mengjie Cui, Li Wang, Aiqin Zhang, Yi Chen, Jun Xiang, Haojun Fan
Summary: A flexible coating film with high-efficient electromagnetic interference shielding effectiveness (EMI SE) can be achieved by adding silver nanowires into waterborne polyurethane/polypyrrole coating film, and it shows excellent EMI shielding reliability to resist bending and ultrasonic water washing.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Agricultural Engineering
Yanhu Zhan, Fang Liu, Yifan Cai, Limin Man, Yuchao Li, Yanyan Meng, Hesheng Xia, Zhenming Chen
Summary: Many ecofriendly and antibacterial polymer-based shielding nanocomposites have been designed to address the serious issues of electromagnetic interference pollution and antibiotic resistance. These composites have a high amount of conductive and antibacterial material and exhibit unparalleled EMI shielding performance and strong antibacterial properties. However, their preparation is extremely challenging due to the formation of large aggregates and high viscosity.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Nanoscience & Nanotechnology
Guolong Sang, Pei Xu, Tong Yan, Vignesh Murugadoss, Nithesh Naik, Yunsheng Ding, Zhanhu Guo
Summary: Lightweight microcellular polyurethane/ carbon nanotubes/nickel-coated CNTs/phase separation polymerizable ionic liquid copolymer composite foams prepared by non-solvent induced phase separation have high electromagnetic shielding effectiveness. Regulation of microcellular structure, conductive network, and microcellular size can enhance the reflection of electromagnetic waves and improve the shielding effectiveness.
NANO-MICRO LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Raghvendra Singh Yadav, Anju, Thaiskang Jamatia, Ivo Kuritka, Jarmila Vilcakova, David Skoda, Pavel Urbanek, Michal Machovsky, Milan Masar, Michal Urbanek, Lukas Kalina, Jaromir Havlica
Summary: Sonochemically synthesized superparamagnetic ZnFe2O4 nanoparticles with controlled structural properties show superparamagnetic behavior. Embedding the prepared nanoparticles and reduced graphene oxide in a polyurethane resin matrix provides shielding against electromagnetic pollution, with high absorption of electromagnetic waves and effective impedance matching. The synergistic effect of ZnFe2O4 and RGO in the PUR matrix leads to significant absorption of electromagnetic waves, offering an innovative approach for lightweight nanocomposites.
Article
Polymer Science
Datong Wu, Xue Cheng, Tianze Zhang, Hong Gao
Summary: With the development of technology, electromagnetic pollution has become a problem in our daily lives. In this study, a new type of electromagnetic interference shielding material was successfully prepared. By adjusting the composition of the composite material, the conductivity and shielding effect can be improved, while the thermal stability is also enhanced. This material shows great potential for practical applications.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Engineering, Environmental
Rulin Shen, Mingjun Long, Chendong Lei, Liming Dong, Guipeng Yu, Juntao Tang
Summary: In this study, the mechanical properties of vegetable oil-based waterborne polyurethane (WPUs) were improved by incorporating sustainable diols. The resulting films demonstrated higher tensile strength and toughness compared to state-of-the-art systems. Among the different diols investigated, WPU-B films exhibited superior performance and increased corrosion resistance. This research provides strategies for controlling the physical properties of environmentally friendly WPUs and developing high-performance coatings for anticorrosion applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Manufacturing
Eunyoung Kim, Hongming Zhang, Jeng-Hun Lee, Haomin Chen, Heng Zhang, Muhammad Humza Javed, Xi Shen, Jang-Kyo Kim
Summary: A MXene/auxetic polyurethane (MX/APU) composite foam has been developed for lightweight electromagnetic interference (EMI) shielding and impact attenuation, demonstrating superior EMI shielding effectiveness and multifunctionalities in lightweight applications.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Composites
Zhixiang Xie, Huaiyu Chen, Sikun Hu, Hongchao Zhao, Wenduo Chen, Dazhi Jiang
Summary: A strategy of constructing three-dimensional network structures of graphene/CNT/polypyrrole by electrochemical deposition is proposed to improve the EMI shielding effectiveness of polypyrrole composite films. The graphene/CNT/polypyrrole films consist of graphene/CNT substrates as skeletons and polypyrrole as bridges to form percolation networks in the multiphase and multihierarchical nanocomposites. With a deposition time of 80 min, the polypyrrole content increases to 30 wt%, the conductivity improves by 27.7%, and the EMI shielding effectiveness improves by 11.4% at X-band. The final film thickness is 249 μm, the conductivity is 3.06 S/mm, and the average EMI shielding effectiveness is 59.6 dB.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Composites
Hussein Oraby, Ibrahim Naeem, Mohammad Darwish, Magdy H. Senna, Hesham Ramzy Tantawy
Summary: Experimental results showed that increasing the filler content can improve the mechanical properties and thermal stability of the composite materials, leading to better electromagnetic interference shielding effectiveness. The polyurethane/graphite composite foamy materials are expected to be a promising material for electromagnetic shielding applications.
POLYMER COMPOSITES
(2021)
Article
Chemistry, Physical
Wang Yang, Hengxuan Bai, Bo Jiang, Chaonan Wang, Weimin Ye, Zhengxuan Li, Chong Xu, Xiaobai Wang, Yongfeng Li
Summary: This study develops a graphene/waterborne polyurethane (G/WPU) flexible film with a densified and ordered layer structure for EMI shielding applications. The graphene nanosheets are efficiently dispersed into the WPU substrate and tightly connected through internal interactions. The resulting G/WPU film exhibits high electrical conductivity, tensile strength, and EMI shielding effectiveness, as well as high cross-plane thermal conductivity.
Article
Materials Science, Composites
Wei Hu, Jia Zhang, Baijun Liu, Chenchen Zhang, Qi Zhao, Zhaoyan Sun, Hui Cao, Guangshan Zhu
Summary: The novel flexible lignin-based electromagnetic shielding polyurethane, FeCLPU, exhibited excellent electromagnetic shielding effectiveness and tensile strength, mainly due to the synergistic effects between Fe3O4, CNT, and lignin. The optimal electromagnetic shielding performance with an EMI SE of 37.5 dB was achieved when the concentrations of Fe3O4 and CNT were both 10%, and the lignin content was 15%.
COMPOSITES COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Hao Wang, Mengyue Liu, Shaonan Li, Xiangyu Zheng, Xing Zhou
Summary: In this study, a self-healing and reliable flexible EMI shielding composite material was developed, which can meet the efficient performance demands in different requirements and electromagnetic environments.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Electrical & Electronic
Wei Liu, Tingting Yao, Kun Jia, Jianyu Gu, Donghong Wang, Xuehong Wei
Summary: The composite film prepared with in situ polymerization and blade coating process shows high electrical and thermal conductivity, as well as outstanding EMI shielding performance. Additionally, the film achieves high EMI SE at 65.3 dB with a thickness of 80 μm.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Composites
Chao Liu, Wei Wu, Yi Wang, Zhengyi Wang, Qiming Chen
Summary: The research synthesized a novel filler@polymer hybrid (Ag@TPU) with excellent thermal conductivity and EMI shielding effectiveness for manufacturing dual-functional elastomer composites.
COMPOSITES COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Yongqin Hu, Chen Hou, Yuxia Shi, Jiamei Wu, Da Yang, Zhuili Huang, Yan Wang, Yufei Liu
Summary: The article introduces a novel stretchable and biocompatible electromagnetic interference shielding film, which can effectively attenuate electromagnetic radiation and exhibit good tensile performance and biocompatibility.
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)
