Rapid air film continuous casting of aluminum alloy using static magnetic field

The influences of the cooling style and static magnetic field on the air film casting process were investigated. Ingots of 6063 aluminum alloy were produced by AIRSOL VEIL casting with double-layer cooling water and static magnetic field. Surface segregation, hot crack and variation of solute content along the radius direction of ingot were examined. The results showed that double-layer cooling water can improve the surface quality and avoid of hot crack, which created conditions to increase the casting speed. The electromagnetic casting process can effectively improve the surface quality in high speed casting process, and static magnetic field has a great influence on solute distribution along the radius direction of ingot.

Investigation of Spontaneous Condensation of an Amino Acid Based Amphiphile on Cast Film by in situ Transmission FT-IR Spectroscopy

The spontaneous condensation of the amphiphilic N-（O,O-dihexadecyl）phosphorylalanine on the cast film was observed by in situ investigation of transmission infrared spectroscopy The particular orientation and ordered packing of the monomers within the multilayers of the cast film is concluded to attribute to the spontaneous condensation between the monomers.

High Charge Mobility of a Perylene Bisimide Dye with Hydrogen-bond Formation Group

A perylene bisimide dye covalently bonded with a hydrogen-bond formation group of 1, 3, 5-triazine-2, 4-diamine has been synthesized. Its casting films show a charge carrier mobility over 10^-3 cm^2/Vs, which is in the range of the highest values found for other promising charge transport materials suitable for solution processable technique.

Practicing the concept of “structuring” processing in the manufacture of polymer films

Polymer processing is a technology used to transfer raw materials into products with different shapes and functionalities and is a key step for polymer application.After years of development,the polymer processing task has changed from traditional processing,which mainly addresses the specific shapes of articles and focuses on the effect of processing on the structures and properties of polymers,to modern processing,which directly transforms a“designed structure”into commercial products via processing.It is the so-called“structuring”processing.Owing to the unique long-chain nature and slow topological relaxation,polymers are always driven and frozen into different nonequilibrium conformations,providing an effective way to design a given polymer material with desired structure and tunable performances via processing.Among the endless number of processing techniques,film casting is a prototypical pathway involving high supercooling or/and a strong flow field,based on which diverse thin polymer films have been successfully developed.In this review,taking isotactic polypropylene(i PP)film as an example,we highlight the strategy of“structuring”processing,in which we transform various crystalline structures of i PP into diverse commercial film products.

Electrocatalytic Oxidation of Dopamine by Ferrocene in Lipid Film Cast on a Glassy Carbon Electrode

The ferrocene-lipid film electrode was successfully prepared by means ofcasting the solution of ferrocene and lipid in chloroform onto a glassy carbon (GC) electrodesurface. Ferrocene saved in the biological membrane gave a couple of quasi-reversible peaks ofcyclic voltammogram. The electrode displays a preferential electrocatalytic oxidation of dopamine(DA). The effect of electrocatalytic oxidation of DA depends on the solution pH and the negativecharge lipid is in favor of catalytic oxidation of DA. The characteristic was employed forseparating the electrochemical responses of DA and ascorbic acid (AA). The electrode was assessedfor the voltammetric differentiation of DA and AA. The measurement of DA can be achieved withdifferential pulse voltammetry in the presence of high concentration of AA. The catalytic peakcurrent was proportional to the concentration of DA in the range of 1 x 10^(-4)―3x10^(-3) mol/L.

High Strength and Stable Proton Exchange Membrane Based on Perfluorosulfonic Acid/Polybenzimidazole

In this work,a series of high strength,thermal stable and antioxidant proton exchange membranes were designed with solution processible polybenzimidazole(PBI)as the matrix and perfluorosulfonic acid(PFSA)as the fortifier for proton exchange.Solution processible PBI was successfully synthesized by introducing 4,4’-dicarboxydiphenyl ether into the molecular chains of PBI.PFSA/PBI composite membranes were obtained by solution blending and film casting.PBI and PFSA/PBI composite membranes exhibited greatly enhanced tensile strength and Young’s modulus compared to PFSA.PFSA/PBI composite membranes are stable below 300℃ which are suitable for practical application in proton exchange membrane fuel cells.The PFSA/PBI composite membranes show good dimensional stability with low water uptake and swelling rate.The PFSA/PBI composite membranes also exhibit excellent antioxidation stability with less than 5%initial mass loss over 120 h in Fenton reagent.The proton conductivity of PBI is greatly enhanced by blending with PFSA and the proton conductivities of the composite membranes are increased with the raise of PFSA content and temperature.This work offers valuable insights into the exploration of PBI based high-performance proton exchange membranes.