Advanced Materials Research Vols. 430-432

Abstract: Years recently, materials with Nano-techniques on highway-works have been studied. Asphalt modified with Carbon-nanotubes-material can be one of them. There are a great deal of –type-conjugate bond and circled construction in them, they can easier bind to asphalt together with SBS than any other Nano-Inorganic material. This paper advances that a series of tests by putting SBS added with Carbon-nanotubes-material into asphalt are done at lab. The data show that the range of Carbon-nanotubes-material can be acceptable from 0.02-0.08%, meanwhile the asphalt-modified in the test can be comfortable with both the heat and the cold environment. Carbon-nanotubes-material can play a key role in the case of SBS added with it.

Abstract: Rosin is one of natural recycled resource which is rich in our country . Its mainly elements is tricyclic diterpenoid resin acid , rosin and disporportionated﹑hydrogenated rosin via esterification to overcome rosin itself existed many shortages,such as easy to suffer from oxidation,colour and luster unsteadiness,brittle,low softening point and expand rosin in many industry application scope . The research on rosin catalysis,esterification turning nature and the application of esterified products in the preparations of hot melt adhesives were reviewed in this paper based on the analyzing the studies in the field during the last decade, and has a prospect to the study .

Abstract: SrTiO₃ dendrites were successfully synthesized by hydrothermal method. An obvious morphology evolution from cubic-like shape to dendrite was observed when KOH concentration varied from 1M to 0.1M at 80°C. A decrease in KOH concentration was found to be favorable for the formation of dendrites. Star-like shape SrTiO₃ crystals instead of dendrites were obtained when the temperature was lowed to 40°C.

Abstract: Experimental methods, such as OM, SEM and X-EDS, were used to study the transverse cracks appeared on the external arc of tensile region during pipe bending. The pipe line steel consists of acicular ferrite (AF) and granular bainite (GB) with good mechanical properties. Copper phase enrichment occurs at prior austenite grain boundaries near the cracks of bend pipe, which is the main reason for the surface cracks. In order to decrease the cracks ratio, the microstructure evolution and stress state during the bending process need to be researched deeply.

Abstract: The research is the reaction of the high-performance fiber Kevlar grafted allyl glycidylether (AGE),in the process ,we use the horseradish peroxidase ( HRP ) as the catalyst, H2O2 as the oxidant of free radicals initiator system .The grafted fiber was made to do the following performance tests: element analysis, infrared, SEM, XRD, TG, Contact Angle, tensile strength, be pull out by monofilament. We can see from the infrared spectra , the peak of the grafted fiber in 1510 cm-1and 1250 cm-1 increase apparently, it shows that the AGE has been grafted.There are new peaks in 760 cm-1 and 690 cm-1，proved the grafted position is in benzene rings; from the SEM ,we know the surface roughness of the grafted fiber increase apparently; the test result of TG showed the Yc increased regularly, both of them prove the succession of the grafting, moreover, the fiber also has the good thermal stability after grafted; the contact angle has been reduced from 80 to 60, shows the content of fiber surface polar groups has been increased, enhance the wettability significantly; the monofilament pull out test shows after grafting the adhesion between the Kevlar fiber and the epoxide resin matrix has been improved

Abstract: Cellulose paper is used as base material for so-called electroactive papers (EAPap) actuator. EAPap is a complex anisotropic material, which has not been extensively characterized and additional basic testing is required before developing application devices from EAPap. Mechanical properties of EAPap were investigated in this work under different environmental conditions (humidity, temperature, and electrical field) and configurations. It shows viscoelastic effect and exhibits two distinct elastic and plastic modulus connected by a bifurcation point. Through tests, environment and configuration effects on EAPap are obtained to researchers and designers interested in the field of smart materials and EAP.

Abstract: Reduced graphene oxide (rGO)/chitosan composite films were fabricated by a solvent casting method and cross-linked using genipin. Their properties were characterized by scanning electron microscopy, X-ray powder diffraction, Raman spectroscopy, and UV-Vis spectroscopy. When rGO was added the tensile strength and membrane rigidity of the films increased, but their swelling ability in water decreased.

Abstract: Nanostructured WC-17Co coating was prepared by means of High Velocity Oxygen Flame (HVOF) technique. When eroded with quartz sand, the erosion wear resistance of nanostructured coating is better than that of 1Cr13. The loss of Co-rich phase dominates the main failure mechanism, following with minor peeling of WC particles.

Abstract: TWIP steel containing 0.21% C, 24.4% Mn, 0.9% Si, 1.84% Al, 4.61% Cr, 1.89% Ni, 0.41% Mo and 0.012% Nb was investigated. Tensile tests of this steel were performed in the strain rate range of 10−4–10−3 s−1. Results indicate that tensile properties of TWIP steel at room temperature are sensitive to strain rate in the studied range. Analyses on the relationship between strain–hardening exponent and strain rates show that the formation of twins during deformation greatly affects the strain–hardening behavior of TWIP steels.

Abstract: A soluble, solution-processable metallopolyyne of platinum (II) functionalized with anthraquinone and fluorene spacers was synthesized. The spectroscopic and photophysical properties of the polymer was also presented.