Key Engineering Materials Vol. 561

Abstract: Molecular imprinted polymers were synthesized with precipitation polymerization in the present study when Erythromycin was used as template, methacrylic acid as functional monomer, and ethylene glycol dimethacrylate as cross-linker. The best synthesis solution was ultimately determined when the bonding property of the polymer was studied. The selectivity of imprinted polymer on Erythromycin was also studied. The equilibrium binding experiments showed that the binding site of MIPs was heterogeneous with one binding site. Equilibrium dissociation constant was 0.663mg/ml, maximum apparent adsorption was 91.39mg/g.

Abstract: Some polymers like polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS) are very hard to be solute in conventional solvents at room temperature, and impossible to be solution electrospun, but they can be easily fabricated into ultra-fine fibers using melt electrospinning. In this study, PP/PVA compound ultra-fine fibers were produced using mlet electrospinning. The effect of PVA content in PP/PVA compound on the properities of resultant fibers was studied. Different plasticizers were added into the compound to find the most effective plasticizer reducing the melt viscosity. It was shown that PP/PVA compound with content of 5% PVA can produce the finest fiber while adding 8% hyper-branched polyester (HBP). In addition, the resultant fibers were made into thin paper using compaction processing, and water absorbability was tested. The results were expected to be used in dyeable PP cloth production and degradable polymer paper production.

Abstract: Four polyaniline hybrid materials were prepared by liquid-state synthesis method in the presence of dopant which synthesized by transition metal mono-substituted Keggin structure silicotungstate anions α, β_i-[SiW₁₁Al (H₂O)O₃₉]^4-.The polyaniline hybrid materials were characterized by elemental analysis, IR spectroscopy, fluorescence spectroscopy, scanning electeon microscopy (SEM) and thermo gravimetric analysis, the properties of which such as thermal stability and conducting behavior were studied. It proved that the average diameter was 100nm, the conductivity was 9×10^-2s·cm^-1 and the flourescence property was better.

Abstract: Based on the tunnel pavement flame retardantcy requirement, flame retardant is added into rubber powder modified asphalt, and then study the flame retardant performance.For flame retardant we chose Decabromodiphenyl ethane instead of decabromodiphenyl ether, silicon is dimethyl silicone oil of flame retardant ,which can improve the flame retardant material performance,we also choose the zinc borate and aluminum hydroxide, through the orthogonal experiment and gray relational analysis method, fire retardant best species composition and dosage level is concluded.

Abstract: In this paper, Φ120 rubber sheeting extruder is used as an example, It analyses reversely die shape through a given product shape, analyses the distributions of the velocity field and pressure field by POLYFLOW, and carries out the finite element analysis and structural optimization design of head runner.

Abstract: This article mainly introduced the structure and the principle of gas barrier of the rubber nano-laminated composite materials with alternating layer structure and excellent gas barrier property. Due to the fact that the barrier resin material was dispersed in matrix rubber evenly and parallelly in nanometer, the phase structure lead to the existence of multipath movement and deep penetration in the composite materials, thus the permeability coefficient of composite materials were reduced significantly. So the rubber nano-laminated composite materials owned excellent gas barrier performance.

Abstract: As one directly method to produce nanofibers, electrospinning has been studied extensively. However, the buckling phenomenon is not understood completely especially to the process of melt electrospinning. The authors carried out a series of experimental study on this phenomenon with high speed video. This is the first article of the research, in which we defined three stages to the whole spinning process according to the time. The specialties of each stage were list out. The falling process was divided into straight-line movement, spiral swinging, and deposits on the collector three sections. The buckling reasons were provided.

Abstract: Unsaturated polyester resins are widely used in the manufacture of fiber reinforced plastics and shipbuilding industry. Their undesirable mechanical property may bring about disadvantages. The nanoparticles were added to the polymer material, which will strengthen the performance of the polymer material. AROPOL G102 / Clay Nanocomposites were prepared by magnetic stirring apparatus at room temperature. The result showed that nano-montmorillonite can effectively increase the mechanical property of the material.

Abstract: Absrtract. In this paper, the method of ultrasonic vibration in preparation of multi-walled carbon nanotubes(MWCNTs)/epoxy resin composites was studied. Suspension specimens of MWCNTs/epoxy resin solution prepared by different ultrasonic conditions were compared to find out the influences of operating conditions on dispersion properties. In this study, transmission electron microscopes(TEM) were used to characterize the morphology of the blends and suspension stability was used to evaluate the stability of blends. The results showed that ultrasonic power, ultrasonic time and material quantity have great effect on the dispersion of MWCNTs in epoxy resin solution. Increasing ultrasonic power and time can improve dispersion of MWCNTs, and decreasing material quantity within an appropriate range was helpful to disperse MWCNTs into epoxy resin solution. The results of suspension stability were very similar with TEM results, which demonstrate that suspension stability of MWCNTs/epoxy resin blending could be used as an assistant method to characterize the dispersion of MWCNTs in epoxy resin.