Article
Polymer Science
Enrique Folgado, Qiao Song, Sebastien Perrier, Vincent Ladmiral, Mona Semsarilar
Summary: This study presents the synthesis of cyclic peptide-poly(vinylidene fluoride) (CP-PVDF) conjugates using (d-alt-l)-cyclopeptides as building blocks and their self-assembly into tube-like structures. The conjugates were prepared with high purity through a grafting-from strategy and controlled self-assembly was achieved by addition of THF, resulting in the formation of long tube-like structures. The unprecedented formation of long tubular peptide-polymer aggregates is believed to be due to synergetic effects between the stacking of cyclic peptides and interactions of the fluoropolymer-peptide conjugates.
Article
Materials Science, Multidisciplinary
Shinji Fukumoto, Kazuhiro Makimoto, Kengo Ohta, Tomohiro Nakamura, Michiya Matsushima, Kozo Fujimoto
Summary: This study measured the change in electrical resistivity during curing of silver particle-dispersed epoxy resin adhesives commonly used as electrically conductive adhesives (ECAs) to evaluate the effect of each component material on their electrical properties. It was found that the thin fatty acid layer on the silver surface provided insulation and was removed during curing, resulting in a significant decrease in electrical resistivity of the conductive adhesives.
JOURNAL OF MATERIALS SCIENCE
(2022)
Review
Materials Science, Multidisciplinary
Xiaoting Song, Guangyue Shi, Guohua Fan, Yao Liu, Runhua Fan
Summary: Percolating graphene/poly(vinylidene fluoride) (GR/PVDF) composites were fabricated via hot-pressing, exhibiting negative permittivity and low percolation threshold. The negative permittivity was attributed to the low-frequency plasma oscillation of free charges, analyzed through the universal regulatory mechanism of the Drude model. Rapid formative 3D GR conductive networks contributed to the low percolation threshold and metal-like behavior.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jiale Fang, Chengqi Chen, Hongxing Qi, Jie Zhang, Xiaoxuan Hou, Likun Pan, Xianghui Wang
Summary: Developing flexible electromagnetic interference (EMI SE) shielding materials is crucial for protecting humans from harmful radiation. We designed and fabricated a flexible multilayer structure of PVDF/GNP-PVDF composite film, which exhibited high EMI SE performance (averaging 69.7 dB in X-band), excellent flexibility, and stability (98.85% retention after bending 1000 cycles at 60 degrees). The theoretical study indicates that the multiple reflection and absorption of electromagnetic waves between layers contribute to the high EMI SE performance of the PVDF/GNP-PVDF multilayer film.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Le N. M. Dinh, Bich Ngoc Tran, Vipul Agarwal, Per B. Zetterlund
Summary: This study explores the effects of different preparation methods on polymer nanocomposite materials, and finds that the stability and physical properties of the nanocomposite films are greatly influenced by the preparation method and compositional details.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Composites
Jian-Ping Cao, Jun Zhao, Xiaodong Zhao, Zhi-Min Dang
Summary: A facile route to prepare high-performance dielectric nanocomposites of PMMA/PVDF/MWNTs was developed, forming a cocontinuous structure through spinodal phase separation. The composites exhibit excellent ductility and conductivity, providing a general pathway to prepare high-performance dielectric polymer materials containing cocontinuous microscale and nanoscale structures.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
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
Chemistry, Physical
Usman Zubair, Nimra Nadeem, Hafiz Affan Abid, Rana Tariq Mehmood Ahmad, Amjed Javid, Munir Ashraf, Zulfiqar Ahmad Rehan
Summary: Textiles' outlook has shifted from ordinary clothing to smart fabrics due to their potential integration with wearable electronics. However, the integration into textiles, substantial sensing capability, and detection of biomotions in a self-powered mode are the main challenges in the development of wearable devices.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Engineering, Electrical & Electronic
Chandan Kumar Raul, Monalisa Halder, Shubhadip Atta, Ajit Kumar Meikap
Summary: The impact of nickel-coated multiwalled carbon nanotube (Ni-MWCNT) filler on poly(vinylidene fluoride) (PVDF) matrix was studied in this work. Characterization of the fabricated flexible composite systems revealed changes in optical, electrical, dielectric, and magneto-dielectric properties. The addition of Ni-MWCNT filler effectively tuned the optical band gap and activation enthalpy. The composite exhibited a significant reduction in optical energy band gap, enhanced dielectric permittivity, and lower dielectric loss compared to pristine PVDF. Moreover, the incorporation of Ni-coated MWCNT in ferroelectric PVDF resulted in higher magneto-dielectric coupling, making the Ni-MWCNT-PVDF film a promising material.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Polymer Science
Anna Kuzminova, Mariia Dmitrenko, Andrey Zolotarev, Denis Markelov, Andrei Komolkin, Roman Dubovenko, Artem Selyutin, Jiangjiexing Wu, Rongxin Su, Anastasia Penkova
Summary: Membrane technology is actively developing in modern societies, allowing for the separation of various mixtures in industrial tasks. This study focuses on the development of effective membranes based on PVDF by modifying it with different nanoparticles. Two types of membranes were developed: dense membranes for pervaporation and porous membranes for ultrafiltration. The optimal nanoparticle content in the PVDF matrix was determined. The properties of these membranes were studied using various techniques, and the transport properties of the membranes were evaluated.
Article
Materials Science, Composites
Jie Wang, Hui Li, Zeyun Wang, Dehua Xin, Jingyun Luo, Shijian Bai, Hongfu Zhou
Summary: Carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) were used as fillers in poly(vinylidene fluoride) (PVDF) composites to improve the electromagnetic interference shielding performance. The addition of CNTs and GNPs improved the conductivity and rheological properties of PVDF, and acted as nucleation agents to increase its crystallization peak temperature. The PVDF composites showed significant enhancement in storage modulus, complex viscosity, and electrical conductivity compared to pure PVDF. The new PVDF samples have potential applications as electromagnetic shielding materials due to their simple processing, low-cost, and solvent-free characteristics.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Multidisciplinary
Dongxing Dun, Jingyun Luo, Minghao Wang, Xingran Wang, Hongfu Zhou, Xiangdong Wang, Bianying Wen, Yuxia Zhang
Summary: Polymeric electromagnetic interference (EMI) shielding foaming materials consisting of PVDF and CNTs are prepared in this study, with adjustable electrical conductivity and excellent EMI specific shielding effectiveness. The inclusion of CNTs enhances the performance of the composite system, and the foaming process provides a green and efficient route for the preparation of these materials.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2021)
Article
Chemistry, Physical
Dong Je Han, Seonwoo Kim, Hyeon Jun Heo, Chaewon Jin, Jin-young Kim, Hongsoo Choi, In Jun Park, Hong Suk Kang, Sang Goo Lee, Jong-Chan Lee, Eun-Ho Sohn
Summary: Antimicrobial PVDF-based polymers were prepared by grafting quaternary ammonium or quaternary pyridinium monomers to effectively kill bacteria and yeast. Adding these polymers to PVDF films through blending method enhanced both mechanical properties and antimicrobial performances, while maintaining biocompatibility.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Benjamin Cromwell, Mara Dubnicka, Lasanthi Sumathirathne, Angela Thach, William B. Euler
Summary: Membranes of PVDF and related polymers are used to decompose RhB under low power sonication, and the change in visible spectrum of RhB allows determination of rate constants for different polymer compositions and membrane thicknesses. The piezoelectric field generated by mechanical deformation of the polymer catalyzes the scission of the C-N bond in RhB. Doping PVDF with transition-metal nitrates increases the rate constants, but the analysis is complicated by concurrent RhB adsorption onto the membrane. A proposed mechanism suggests that the piezocatalytic effect of the membrane leads to heterolytic cleavage of the C-N bond followed by formation of a C-Cl bond on the new xanthene ring.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Polymer Science
Ruru Wan, Xiaoli Sun, Zhongjie Ren, Haijun Wang, Huihui Li, Shouke Yan
Summary: Poly(vinylidene fluoride) (PVDF) films with polymorphic crystal structure were prepared and the effects of heat treatment on the crystal morphology and properties were studied. The results provide a useful way to induce the formation of polar PVDF phases.
