Dufaye, Maxime; Duval, Sylvain; Stoclet, Grégory; Trivelli, Xavier; Huvé, Marielle; Moissette, Alain; Loiseau, Thierry
Uranyl Cation Incorporation in the [P8W48O184]40– Macrocycle Phosphopolytungstate
Association of uranyl nitrate with the macrocycle 40– in formate buffered aqueous solution leads to the formation of a new compound (K11.3Li8.1Na22)·89H2O (1). Its characterization by XRD reveals a high disorder of the uranyl cations and the formation of monodimensional chains of anionic 41.4– entities linked through…
Impact of water and thermal induced crystallizations in a PC/MXD6 multilayer film on barrier properties
Messin, Tiphaine; Marais, Stéphane; Follain, Nadège; Chappey, Corinne; Guinault, Alain; Miquelard-Garnier, Guillaume; Delpouve, Nicolas; Gaucher, Valérie; Sollogoub, Cyrille
A multilayer film composed of alternating layers of polycarbonate (PC) and poly(m-xylene adipamide) (MXD6) was elaborated by using an innovative multilayer coextrusion process. Quasi-continuous thin MXD6 layers (nanolayers) alternating with PC layers were successfully obtained. The PC/MXD6 multilayer film showed a confining effect of MXD6 exerted by PC layers leading…
Dispersion of reduced graphene oxide within thermoplastic starch/poly(lactic acid) blends investigated by small-angle X-ray scattering
Ferreira, Willian H.; Dahmouche, Karim; Andrade, Cristina T.
Reduced graphene oxide (rGO) was incorporated into plasticized cornstarch (TPS), poly(lactic acid) (PLA) and their blends. Small-angle X-ray scattering (SAXS) was used to investigate rGO dispersion within the materials. For the TPS/PLA blend at 70:30 composition, the incorporation of rGO led to a larger fraction of small-sized rGO sheets, which…
Poly(vinylidene fluoride)-based nanocomposite employing oriented Bi2S3 nanorods with double-shell structure for high dielectric performance and loss suppression
Zhang, Lingyu; Wang, Yao; He, Dalong; Deng, Yuan
For polymer-based nanocomposites, designing the nanostructures of fillers, their distribution inside matrix as well as interfaces with the polymer is of crucial importance to achieve high dielectric performances. One-dimensional semiconductor Bi2S3 nanorods coated with homogeneous SiO2 and polydopamine (PDA) double shell layers were imported into the poly(vinylidene fluoride) (PVDF) with…
Local Chain Alignment via Nematic Ordering Reduces Chain Entanglement in Conjugated Polymers
Xie, Renxuan; Aplan, Melissa P.; Caggiano, Nicholas J.; Weisen, Albree R.; Su, Tang; Müller, Christian; Segad, Mo; Colby, Ralph H.; Gomez, Enrique D.
Chain entanglements govern the dynamics of polymers and will therefore affect the processability and kinetics of ordering; it follows that through these parameters chain dynamics can also affect charge transport in conjugated polymers. The effect of nematic coupling on chain entanglements is probed by linear viscoelastic measurements on…
Self-Assembled Block Copolymer Electrolytes: Enabling Superior Ambient Cationic Conductivity and Electrochemical Stability
Pelz, Alexander; Dörr, Tobias Sebastian; Zhang, Peng; de Oliveira, Peter William; Winter, Martin; Wiemhöfer, Hans-Dieter; Kraus, Tobias
Block copolymers are promising materials for electrolytes in lithium metal batteries that can be tuned by changing the individual blocks to independently optimize ion transport as well as electrochemical and mechanical stability. We explored the performance of electrolytes based on modified triblock copolymers, poly(isoprene)-block-poly(styrene)-block-poly(ethylene oxide). Large polyethylene…
Aggregation in organic phases after solvent extraction of uranyl nitrate: X-ray scattering and molecular dynamic simulations
Paquet, Amaury; Diat, Olivier; Berthon, Laurence; Guilbaud, Philippe
In the framework of spent nuclear fuel reprocessing, N,N‑dialkylamides are molecules of interest for the selective recovery of uranium and plutonium. Two monoamides, DEHBA (N,N‑di‑2‑ethylhexyl‑butyramide) and MOEHA (N,N‑methyl, octyl‑2‑ethylhexanamide), were investigated to evaluate the effect of their structure on the molecular and supramolecular speciation in organic phase. The structure of…
Biomimetic Supertough and Strong Biodegradable Polymeric Materials with Improved Thermal Properties and Excellent UV-Blocking Performance
Zhang, Xiao; Liu, Weifeng; Yang, Dongjie; Qiu, Xueqing
The preparation of biodegradable polymeric materials with both great strength and toughness remains a huge challenge. The natural spider silk exhibits a combined super high tensile strength and high fracture toughness (150–190 J g−1), attributing to the hierarchically assembled nanophase separation and the densely organized sacrificial hydrogen bonds confined in…
In-situ construction of “octopus”-like nanostructure to achieve high performance epoxy thermosets
Heng, Zhengguang; Zhang, Xueqin; Chen, Yang; Zou, Huawei; Liang, Mei
Inspired by the octopus, a typical nanostructure consisting of a spherical “body” and worm-like “tentacles with suckers” was constructed through incorporating polydimethylsiloxane-block-poly(ε-caprolactone)-block-polystyrene (BXLS) in epoxy thermosets. The novel nanostructure of BXLS copolymer and its morphology evolution during the epoxy curing process were investigated by transmission electron…
Bimodal mesoporous hard carbons from stabilized resorcinol-formaldehyde resin and silica template with enhanced adsorption capacity
Fuentes-Quezada, Eduardo; de la Llave, Ezequiel; Halac, Emilia; Jobbágy, Matías; Viva, Federico A.; Bruno, Mariano M.; Corti, Horacio R.
Hard carbon powders with hierarchical mesoporous structure from resorcinol-formaldehyde polymer were successfully prepared by use of double pore forming method. Poly-diallyldimethylammonium chloride (pDADMAC) and commercial silica (Sipernat® 50) were used as structuring agent and hard template, respectively. Through the proposed procedure carbon powder with bimodal mesoporous size distribution…