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
Engineering, Chemical
Hisao Hori, Ryo Honma, Kazuma Igarashi, Abdelatif Manseri, Bruno Ameduri
Summary: This study investigates the decomposition of functional fluoropolymers, poly[vinlyidene fluoride-co-2-(trifluoromethyl) acrylic acid] co-polymers, in superheated water for the purpose of recycling fluorine. The degradation of these copolymers was achieved using two oxidizing agents and resulted in low total organic carbon content. Furthermore, the addition of Ca(OH)(2) to the reaction solutions allowed for the recovery of pure CaF2.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Polymer Science
Jin Hamaura, Ryo Honma, Hisao Hori, Abdelatif Manseri, Bruno Ameduri
Summary: Mineralization of PVDF, VDF-co-HFP and ETFE in superheated water with an alkaline reagent was studied for fluorine element recycling. The polymers underwent defluorination to form fluoride ions at 250 degrees Celsius in an Ar atmosphere. The presence of O2 instead of Ar resulted in different products. Consecutive runs did not reduce the yield of fluoride ions. PVDF, VDF-co-HFP, and ETFE copolymers completely mineralized to form fluoride ions with yields of 95%, 100%, and 98%, respectively. Adding Ca(OH)2 to the reaction solutions produced artificial fluorspar.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Nicolas Maria, Jon Maiz, Daniel E. Martinez-Tong, Angel Alegria, Fatimah Algarni, George Zapzas, Nikos Hadjichristidis, Alejandro J. Mueller
Summary: By comparing the crystallization and morphology of two linear diblock copolymers and blends, it was found that the diblock copolymers are miscible in the melt state while the blends are immiscible. The crystallization of PVDF is strongly influenced by its environment, with different polymorphic compositions induced by cooling rate or crystallization temperature.
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)
Review
Physics, Applied
Yang Liu, Xin Chen, Zhubing Han, Huamin Zhou, Qing Wang
Summary: Defect engineering is a crucial strategy for designing high-performance ferroelectric polymers, which can tune various physical properties and structure-performance relationships. This Review summarizes the influence of defects induced by different monomers on the physical properties and structure of ferroelectric polymers, and discusses the effects of defect modification on dielectric, ferroelectric, electromechanical, and electrocaloric properties.
APPLIED PHYSICS REVIEWS
(2022)
Article
Polymer Science
Zhubing Han, Hancheng Qin, Xin Chen, Wenhan Xu, Yang Liu, J. Bernholc, Qing Wang
Summary: The incorporation of comonomers in PVDF-based ferroelectric polymers has been widely used to modify their structures and properties. Previous studies have shown that large-sized comonomers can induce relaxor ferroelectricity, but this study demonstrates that a small-sized comonomer can preferentially adopt a polar all-trans conformation, resulting in terpolymers with robust ferroelectricity and enhanced transition temperature and coercive field. This work systematically investigates the effects of comonomer size on the microstructures and properties of ferroelectric polymers.
Article
Food Science & Technology
Cathrine Finne Kure, Solveig Langsrud, Trond Moretro
Summary: The study assesses the fungicidal effect of a H2O2 mist generating system on food-related mould spores dried on stainless steel. Results show >3 log reduction in mould spores after exposure to H2O2 mist for 2 or 4 hours, with raw meat juice having an adverse effect on Penicillium and Mucor in some tests. The research confirms the efficiency of H2O2 mist in reducing food-related mould spores on surfaces.
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
Engineering, Chemical
Shaobo Zhang, Yi Li, Yan Yuan, Li Jiang, Haitao Wu, Yanmao Dong
Summary: Membrane separation is an effective method for treating oily wastewater. This study improved the efficiency of oil-in-water emulsion separation by using alkali treatment to promote the deposition of Fe (III) on PVDF membranes. A hydrophilic coating was also produced on the membrane surface, enhancing permeability and antifouling properties. The modified membrane showed excellent pure water flux and oil rejection, as well as underwater anti-oil adhesion and antifouling properties. This environmentally friendly PVDF membrane modification strategy has great potential for oil-in-water emulsion separation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Materials Science, Composites
Yu'an Bai, Xinyi Wei, Dongxing Dun, Shijian Bai, Hongfu Zhou, Bianying Wen, Xiangdong Wang, Jing Hu
Summary: Driven by the demands in mobile electronics, aerospace and military, this study developed quaternary nanocomposite foams with lightweight, good environmental stability and efficient electromagnetic interference (EMI) shielding properties through melt blending and supercritical CO2 foaming technology. The nanocomposites showed significant improvements in crystallization temperature, storage modulus, complex viscosity, and EMI shielding effectiveness compared to pure PVDF. This study provides a promising approach for the fabrication of materials with adjustable EMI shielding property in the electronics and aerospace industries.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Physical
Li-Jing Zhu, Ming Yang, Gang Wang, Zhi-Xiang Zeng, Zheng-Feng Jia
Summary: Superoleophobic and anti-oil adhesion membranes were prepared using vapor-induced phase separation and sulfonated dopamine deposition. The resulting membranes showed excellent performance in removing emulsified toluene from water.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(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.
Article
Chemistry, Multidisciplinary
Minmin Wang, Weiqun Liu, Xu Shi, Jinyang Pan, Bing Zhou, Jin Wang, Tongming Sun, Yanfeng Tang
Summary: An additive-free, beta-phase porous PVDF aerogel with high electron affinity was prepared and demonstrated high output performance as a triboelectric layer in a TENG. The aerogel showed significantly improved power density compared to non-aerogel PVDF TENGs, and had applications in lighting multiple LEDs and serving as a self-powered motion sensor.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Engineering, Chemical
Sanaz Abbasi, Antoni Forner-Cuenca, Wiebrand Kout, Kitty Nijmeijer, Zandrie Borneman
Summary: In this study, cost-effective dense membranes for hydrogen-bromine flow batteries were developed by blending proton-conductive sulfonated poly(ether ether ketone) (SPEEK) with inert poly(vinylidene fluoride) (PVDF) to improve ionic conductivity and bromine diffusion properties. The use of wire-electrospinning enhanced the performance of the membranes, but the decreased thickness and insufficient stability of the membrane containing 80/20 SPEEK/PVDF led to rapid decay in cycling performance. This research promotes a long-term comparison study between the low-cost wire-electrospun SPEEK/PVDF blend membranes and typically used PFSA membranes for HBFB performance.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Polymer Science
Jin Hamaura, Ryo Honma, Hisao Hori, Abdelatif Manseri, Bruno Ameduri
Summary: Mineralization of PVDF, VDF-co-HFP and ETFE in superheated water with an alkaline reagent was studied for fluorine element recycling. The polymers underwent defluorination to form fluoride ions at 250 degrees Celsius in an Ar atmosphere. The presence of O2 instead of Ar resulted in different products. Consecutive runs did not reduce the yield of fluoride ions. PVDF, VDF-co-HFP, and ETFE copolymers completely mineralized to form fluoride ions with yields of 95%, 100%, and 98%, respectively. Adding Ca(OH)2 to the reaction solutions produced artificial fluorspar.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Bruno Ameduri
Summary: Per- or polyfluoroalkyl substances (PFASs) can be divided into two families: low molar-mass PFASs, which are toxic and restricted, and polymeric ones. Fluoropolymers (FPs) are niche specialty bio-inert and safe polymers with outstanding properties, making them valuable and irreplaceable materials in many high tech applications. Despite the pressure faced by all PFASs, the concerns regarding industrial production of FPs have been addressed, highlighting their separation from conventional PFASs.
JOURNAL OF FLUORINE CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Lolwa Haydar, Wassim El Malti, Vincent Ladmiral, Ali Alaaeddine, Bruno Ameduri
Summary: New fluorinated polyhydroxyurethanes (FPHUs) were synthesized through the polyaddition reaction of a fluorinated bis(cyclocarbonate) (bis-CC) with a diamine. The fluorinated bis-CC was synthesized using a fluorinated diepoxide and LiBr catalyst. The reaction conditions were optimized and the FPHUs were characterized by various spectroscopic techniques and compared to their hydrogenated counterparts.
Article
Biochemistry & Molecular Biology
Frederic Boschet, Georgi Kostov, Hristina Raynova, Bruno Ameduri
Summary: The copolymerization and terpolymerization of 1,1,3,3,3-pentafluoropropene (PFP) with various fluorinated and hydrogenated comonomers were studied. The addition of vinylidene fluoride (VDF) improved the yields of terpolymers, while copolymers with non-homopolymerizable monomers showed low yields. The resulting polymers were amorphous fluoroelastomers or fluorothermoplastics with good thermal stability.
Article
Polymer Science
Jamila Taibi, Sophie Rouif, Bruno Ameduri, Rodolphe Sonnier, Belkacem Otazaghine
Summary: This study focuses on the one-step radiografting of flax fabrics with phosphonated and fluorinated polymer chains using (meth)acrylic monomers. The pre-irradiation procedure at 20 and 100 kGy allows the flax fabrics to have flame retardancy and hydro- and oleophobicity properties. The successful grafting of flax fibers is confirmed by FTIR spectroscopy, while the morphology, regioselectivity of grafting, and distribution of elements are assessed by SEM-EDX.
Review
Chemistry, Multidisciplinary
Zexi Zhang, Kaixuan Chen, Bruno Ameduri, Mao Chen
Summary: Fluorinated polymeric nanoparticles (FPNPs) combine the properties of fluorocarbon and polymeric nanoparticles. Well-defined FPNPs with complex structures, compositions, morphologies, and functionalities can be obtained through reversible-deactivation radical polymerizations (RDRPs). These FPNPs have promising applications in magnetic resonance imaging, biomedical delivery, energy storage, etc.
Article
Polymer Science
Jeet Sharma, Cedric Totee, Vaibhav Kulshrestha, Bruno Ameduri
Summary: This study provides new insights into the dehydrofluorination of poly(vinylidene fluoride) in alcoholic sodium hydroxide through the use of infrared, Raman and nuclear magnetic resonance spectroscopies. The reactivity of different phases and site selectivity is examined, and the formation of the -(CH=CF)- double bond is confirmed by 1H -19F heteronuclear correlation spectroscopy.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Materials Science, Biomaterials
Ryohei Koguchi, Katja Jankova, Yukiko Tanaka, Aki Yamamoto, Daiki Murakami, Qizhi Yang, Bruno Ameduri, Masaru Tanaka
Summary: Hydrophilic materials can be made water insoluble by copolymerizing hydrophilic monomers with hydrophobic ones. By adding small amounts of fluorine to the copolymers, the hydrophilicity can be improved and excellent bio-inert properties can be achieved.
BIOMATERIALS ADVANCES
(2023)
Article
Polymer Science
Fatima Ezzahra Bouharras, Salima Atlas, Simone Capaccioli, Massimiliano Labardi, Abdelghani Hajlane, Bruno Ameduri, Mustapha Raihane
Summary: Core-double-shell-structured nanocomposite films consisting of PVDF-g-BT incorporated into a P(VDF-co-HFP) copolymer matrix were prepared for energy storage applications. The addition of PVDF-g-BT improved the thermal stability and crystallinity of the films. The films exhibited three dielectric processes, and mechanical analysis confirmed the uniform distribution and strong interaction of PVDF-g-BT with the copolymer matrix. The suggested system shows promise for high-energy-density storage devices such as supercapacitors.
Review
Chemistry, Multidisciplinary
Bruno Ameduri, Hisao Hori
Summary: This article presents the latest technology in the recycling, reuse, thermal decomposition, and life cycle assessment of fluoropolymers. Fluoropolymers have exceptional properties and are widely used in high-tech industries. The reuse of fluoropolymers is still underdeveloped, leading to increased interest in their recycling. Recent studies have also focused on vitrimers, and efforts have been made to avoid the release of harmful substances during thermal degradation.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Ali Alaaeddine, Vincent Ladmiral, Wassim El Malti, Lolwa Haydar, Sylvain Caillol, Bruno Ameduri
Summary: Efficient methods for the cycloaddition of CX2 with fluorinated epoxides to produce cyclic carbonates or cyclic xanthates were developed. By optimizing the reaction conditions, high yields of the desired products were obtained. The reaction was proven to be reproducible with different substrates and two new fluorinated five-membered bis-CCs and bis-XAs were synthesized with high yields.
COMPTES RENDUS CHIMIE
(2023)
Article
Polymer Science
Fatima Ezzahra Bouharras, Massimiliano Labardi, Elpidio Tombari, Simone Capaccioli, Mustapha Raihane, Bruno Ameduri
Summary: The dielectric properties of PVDF-g-BT core-shell structured nanocomposites obtained by RAFT polymerization were investigated. The dielectric constant increased with the addition of BT, exhibiting a larger increase than predicted by usual modeling methods for composite materials, due to the effect of the interfacial core-shell structure. PVDF's known dielectric relaxations were observed in both the neat polymer and its nanocomposites, unaffected by the presence of nanoparticles. A relaxation process due to interfacial polarization was found at higher temperatures, attributed to the high crystallinity of the materials produced by RAFT.
Review
Biochemistry & Molecular Biology
Bruno Ameduri
Summary: This review discusses the differences between fluoropolymers (FPs) and low-molar-mass per- and polyfluoroalkyl substances (PFASs), highlighting the safety, durability, and diverse applications of FPs in various aspects of daily life. It also provides information on the recycling and risk assessment of FPs.
Article
Chemistry, Multidisciplinary
Antoinette Fayad, Wassim El Malti, Bruno Ameduri, Ali Alaaeddine
Summary: New functionalized vinyl ethers were synthesized by transetherification reaction with the use of an air-stable palladium catalyst. The reaction conditions were optimized, leading to good yields of the desired products.
COMPTES RENDUS CHIMIE
(2022)
