1,3-Dichloro-2-nitrosobenzene and 1,3-dibromo-5-fluoro-2-nitrosobenzene reacted with amines to give previously unknown nitrosobenzene derivatives containing alkylamino groups in positions 3 and 5. 相似文献
Journal of Solid State Electrochemistry - Recent scientific data in respect of the different effect of citric acid on antioxidant activity of plant polyphenols in pure solutions (no polyphenol... 相似文献
An assortment of prepregs representing adhesive matrices with regulated strength and heat resistances reinforced with glass and carbon fibers of different structures is reported. The processing of adhesive prepregs into items used for the production of honeycomb structures with simple and complex curvatures in one process step is described. 相似文献
Grades and physicomechanical characteristics of glass and carbon fiber-reinforced plastics based on adhesive prepregs are presented. Certain fields of application of these materials are shown. 相似文献
Despite intensive research on sustainable elastomers, achieving elastic vitrimers with significantly improved mechanical properties and recyclability remains a scientific challenge. Herein, inspired by the classical elasticity theory, we present a design principle for ultra-tough and highly recyclable elastic vitrimers with a defined network constructed by chemically crosslinking the pre-synthesized disulfide-containing polydimethylsiloxane (PDMS) chains with tetra-arm polyethylene glycol (PEG). The defined network is achieved by the reduced dangling short chains and the relatively uniform molecular weight of network strands. Such elastic vitrimers with the defined network, i.e., PDMS-disulfide-D, exhibit significantly improved mechanical performance than random analogous, previously reported PDMS vitrimers, and even commercial silicone-based thermosets. Moreover, unlike the vitrimers with random network that show obvious loss in mechanical properties after recycling, those with the defined network enable excellent thermal recyclability. The PDMS-disulfide-D also deliver comparable electrochemical signals if utilized as substrates for electromyography sensors after the recycling. The multiple relaxation processes are revealed via a unique physical approach. Multiple techniques are also applied to unravel the microscopic mechanism of the excellent mechanical performance and recyclability of such defined network. 相似文献
Compatibility of the lithium-titanium spinel Li4Ti5O12 in contact with precursors of lithium-conducting solid electrolytes of composition Li1.3Al0.3Ti1.7(PO4)3 (LATP), Li1.5Al0.5Ge1.5(PO4)3 (LAGP), Li0.5La0.5TiO3 (LLT) was studied. It was found that, in sintering of Li4Ti5O12 brought in contact with LATP and LAGP, a solid-phase reaction occurs to give nonconducting phases (TiO2 and Li3PO4). The conductivity of the stable composite Li4Ti5O12/LLT (10%) is higher than that of the starting Li4Ti5O12, which makes it possible to regard the composite as a promising anode material for lithium-ion batteries. 相似文献
We present a novel method for the fabrication of one-dimensional (1-D) self-assembled monolayers and multilayers (SAMs) of (12-pyrrol-1-yl-dodecyl)-phosphonic acid (Py-DPA) on various polar surfaces using polyelectrolyte nanostructures as positive templates. Particularly, we demonstrate that (i) patterns of aligned 1-D polycation structures on a poly(dimethylsiloxane) stamp can be prepared by moving a droplet of polycation solution along the surface; (ii) these patterns can be used as templates for the ordered assembly of Py-DPA in water where Py-DPA carries a charge opposite to the charge of the template; and (iii) Py-DPA SAMs can then be transferred onto mica or silicon wafers by a printing process. These nanostructures with a polymerizable pyrrole headgroup might be useful for the creation of electrically conductive patterns of conjugated polymers. 相似文献
A novel route towards the synthesis of well‐defined linear–dendronized diblock copolymers is reported. Precursor alkyne containing diblock copolymers were modified in a highly efficient cycloaddition reaction with dendritic azides of different generation. The dendronization has been shown to be selective and could be driven to completion under ambient conditions. The phase separation of such dendronized diblock copolymers was investigated in dependence of the generation size being attached. Compared to a linear–linear diblock copolymer as starting material the dendronization yielded in a pronounced phase separation. The nanoscaled features observed in thin films strongly depended on the dendron size and a variety of morphologies could be identified. Hence, the unique combination of controlled radical polymerization and click chemistry allows for the triggering of structured surfaces in the nanometer‐regime.