NOPR Collection:

Preparation and characterization of nano N,N'-bis(1,2,4-triazol-3-yl-) -4,4'-diamino-2,2', 3,3', 5,5', 6,6'-octanitroazo-benzene explosive

Wed, 01 Oct 2014 00:00:00 GMT

Title: Preparation and characterization of nano N,N'-bis(1,2,4-triazol-3-yl-) -4,4'-diamino-2,2', 3,3', 5,5', 6,6'-octanitroazo-benzene explosive Authors: Mousavi, S; Esmaeilpour, K; Keshavarz, M H Abstract: In this study, nano N,N'-Bis(1,2,4-triazol-3-yl-)-4,4'-diamino-2,2', 3,3', 5,5', 6,6'-octanitroazo-benzene (BTDAONAB) is prepared by spraying a solution of BTDAONAB–acetone into n-hexane or carbon tetrachloride during solvent/anti-solvent process. For this process, suitable solvent and anti-solvent have been chosen. A combination of a supersaturated solution of soluble material and an anti-solvent provides a driving force for the preparation of nanoparticles. During mixing process, the rate of nucleation is relying on saturated solvent. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA) analysis methods are used to characterize nanoparticles. Page(s): 585-588

Development of natural long fiber thermoplastic composites for automotive frontal beams

Wed, 01 Oct 2014 00:00:00 GMT

Title: Development of natural long fiber thermoplastic composites for automotive frontal beams Authors: Jeyanthi, S; Rani, J Janci Abstract: Tradition of using natural fibers in automotive exterior and interior components are essential to recover eco-efficiency and renewability. Natural fibers have recently become sociable to automotive industry as an alternative reinforcement for synthetic glass fiber reinforced thermoplastics. Bumper beams are essential in protection of passengers, engine components during frontal collision. The use of steel, aluminum, glass mat thermoplastics (GMT), sheet metal components (SMC) as bumpers becomes higher cost, weight, than long fiber reinforced thermoplastics. The objective of the work is to develop a partially eco-friendly injection moulded hybrid long fiber reinforced thermoplastics with natural kenaf fiber by impregnation process to improve the desired mechanical properties, thermal properties and recycling of the automotive components. This hybrid composite results assured the better performance, weight reduction, economical compared to conventional bumper materials. Page(s): 580-584

Influence of the composition ratio of manganese and copper on the mechanical properties and the machining performance of ductile iron

Wed, 01 Oct 2014 00:00:00 GMT

Title: Influence of the composition ratio of manganese and copper on the mechanical properties and the machining performance of ductile iron Authors: Rao, Lei; Tao, Wei-wei; Wang, Shuang-jun; Geng, Mao-peng; Cheng, Guo-xiang Abstract: In the present investigation, we studied the influence of the composition ratio of manganese and copper on the mechanical properties and the machining performance of a ferritic-pearlitic ductile iron. A series of Y-block specimens and stair specimens were casted using different manganese and copper levels. The experiments indicated that manganese can efficiently improve the strength of ductile iron, but the plasticity and machining performance decrease significantly when the manganese content exceeds 0.9%. To obtain high strength castings at low manganese levels, the Mn-Cu alloying treatment was also investigated here. The results indicated that with 0.6%-0.8% of Mn and 0.5%-0.8% of Cu, the tensile strength of ductile iron can be in the range of 600-725 MPa, the elongation can remain above 5.5%, and the machining performance is satisfactory. Furthermore, the distribution of manganese and copper in the ductile iron matrix was also investigated. Page(s): 573-579

Preparation of MWNTs/polyaniline composite membranes by filtration and flash welding method

Wed, 01 Oct 2014 00:00:00 GMT

Title: Preparation of MWNTs/polyaniline composite membranes by filtration and flash welding method Authors: Cai, Sisi; Li, Xiaoyan; Wang, Xia; Yu, Dengguang; Ding, Jie; Liao, Yaozu Abstract: This paper reports the fabrication of multiwalled carbon nanotubes (MWNTs)/polyaniline (PANi) composite membranes by a filtration and flash welding method. MWNTs are acid treated to acquire better distribution in the composite membranes. PANi-nanofibers with a unique photothermal property are obtained by chemical oxidative polymerization of aniline. Dense MWNTs/PANi composite membranes are produced by filtration and a subsequent flash welding method. For the strong shear forces during the suction process, partly aligned MWNTs could be found in MWNTs/PANi composite membranes. Owing to the cross-linking structure of PANi nanofibers resulted by flash welding, composite membranes with an improved wettability could be obtained by intensity flash irradiation. Furthermore, the wettability improved with the increasing of flash times. Page(s): 567-572