Manoharan, Partheban; Das, Narayan Chandra; Naskar, Kinsuk
On-demand tuned hazard free elastomeric composites: A green approach
Rising ecological concerns and depletion of the potentially harmful environmental impacts caused by rubber products, are of prime importance in the industry. Therefore, implementation of sustainable greener materials is required to minimize the detrimental influences. In this research, we investigated the beneficial influence of naturally derived bio-resin toward the effects…
Preparation and Properties of High-performance Polyimide Copolymer Fibers Derived from 5-Amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole
Dai, Xue-Min; Gao, Hong; Zhang, Ran; Du, Zhi-Jun; Shi, Tong-Fei; Ji, Xiang-Ling; Qiu, Xue-Peng; Men, Yong-Feng
A series of polyamic acid copolymers (co-PAAs) with para-hydroxyl groups was synthesized using two diamine monomers, namely p-phenylenediamine (p-PDA) and 5-amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole (m-pHBOA), of different molar ratios through copolymerization with 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) in N,N-dimethyacetamine (DMAc). The co-PAA solutions were used to fabricate…
Functionally Active Membrane Proteins Incorporated in Mesostructured Silica Films
Jahnke, Justin P.; Idso, Matthew N.; Hussain, Sunyia; Junk, Matthias J. N.; Fisher, Julia M.; Phan, David D.; Han, Songi; Chmelka, Bradley F.
A versatile synthetic protocol is reported that allows high concentrations of functionally active membrane proteins to be incorporated in mesostructured silica materials. Judicious selections of solvent, surfactant, silica precursor species, and synthesis conditions enable membrane proteins to be stabilized in solution and during subsequent coassembly into silica–surfactant composites with nano-…
Influences of Compression on the Mechanical Behavior and Electrochemical Performances of Separators for Lithium Ion Batteries
Yu, Yansong; Xiong, Bijin; Zeng, Fangxinyu; Xu, Ruizhang; Yang, Feng; Kang, Jian; Xiang, Ming; Li, Lu; Sheng, Xingyue; Hao, Zengheng
Compression stress on thickness direction of separators exists in assembling and operation of all lithium ion batteries (LIBs). In this study, influences of compression on microporous morphologies, electrolyte uptake behavior, and electrochemical properties of three types of commercial separators (PP-U, PP-B, and PE-B) for LIBs manufactured via different processes, were…
Factors controlling the structure of syndiotactic polystyrene upon the guest exchange and guest extraction processes
Shaiju, P.; Bhoje Gowd, E.
The role of host preparation method on the structural phase transition of syndiotactic polystyrene (sPS) after the guest exchange process has been thoroughly investigated in our previous study using a series of n-alkanes . In addition to the host preparation method, we have found that guest molecules used for the…
New Insights into the Growth Mechanism of Ultrathin Au Nanowires from Combined in Situ EXAFS and SAXS Studies
Pschunder, Fernando; Puig, Julieta; Giovanetti, Lisandro J.; Huck-Iriart, Cristián; Requejo, Félix G.; Buceta, David; Hoppe, Cristina E.; Ramallo-López, José M.
The synthesis of Au nanowires (NWs) in hexane solution of HAuCl4·3H2O, oleylamine and triisopropylsilane at room temperature was “in situ” monitored by means of X-ray absorption fine structure spectroscopies and small-angle X-ray scattering to determine, under identical synthesis conditions, both the changes in the oxidation state of gold atoms and…
Thermal behavior of poly(VDF-ter-TrFE-ter-CTFE) copolymers: Influence of CTFE termonomer on the crystal-crystal transitions
Bargain, François; Thuau, Damien; Panine, Pierre; Hadziioannou, Georges; Domingues Dos Santos, Fabrice; Tencé-Girault, Sylvie
Depending on their CTFE content (from 0 to 10 mol %), poly (VDF-ter-TrFE-ter-CTFE), poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene) copolymers exhibit ferroelectric (FE) or relaxor ferroelectric (RFE) properties at low temperature whereas they all present paraelectric (PE) behavior at high temperature. This thermal evolution of their electro-active properties is…
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…
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…
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…