Advanced Materials Research Vol. 772

Abstract: Controlled impact may be done if the source of additional force is placed on one of the impact bodies and this force is acting during the impact time. The use of Industrial Rocket Engine (IRE), produced in Bulgaria, enables the controlled impact technology. A laboratory set up was created in order to explore the controlled impact. Experiments on plastic deformation of lead specimens were conducted on this devise using controlled impact. An increase of the specimen deformation was obtained compared to the common free-fall impact deformation as well as a decrease of the rebound to zero (we called that a sticking impact). The results obtained make clear that the use of IRE propelled production machines for plastic deformation technologies improve those processes and decrease the production drain.

Abstract: Dispersing silver nanoparticles homogeneously into a polymer matrix by ex situ methods is difficult because of the easy agglomeration of nanoparticles. Therefore, convenient and effective ways of preparing Ag nanoparticles in polymer materials are still in strong demand. Vacuum deposited thin discontinuous silver films on the composite of Poly (vinylpyrrolidone) (PVP) and poly (4-vinylpyridine) (P4VP) is an in situ and eco friendly method. Films on softened PVP give rise to a very high room temperature resistance approaching that of the substrate resistance indicating non uniform formation of silver clusters. On the other hand, films on softened P4VP gives rise to a room temperature resistance in the range of a few tens to a few hundred MW/€, which is desirable for device applications due adequate size and uniform dispersal of silver clusters in P4VP. Silver films on PVP/P4VP blend show room temperature resistances in the desirable range indicating uniform subsurface formation of silver films on PVP/P4VP. The Electrical, optical and plasmonic response of Ag NP onto thin layers of PVP/P4VP shows encapsulation of nanoparticles. Silver nanocomposite film exhibits characteristic UV absorbance spectrum at a wavelength of 430 nm, due to the surface plasmon resonance of nanosized silver. Silver ions being bioactive killed bacteria on infected wounds on living tissue and led physician to use wound dressing containing silver sulfadiazine and Ag NP to treat external infections. Silver lining food helps in treating various remedies and ailments.

Abstract: Actual and prospective Russian market of polyolefins is analyzed. Growth of polyolefin capacities and triethylaluminium consumption as co-catalyst with Ti-Mg catalysts for polypropylene production in Russian Federation is shown. Quality of Russian and foreign triethylaluminium is compared. Project of modernization of TEA installation at Tomskneftekhim LTD is presented.

Abstract: The article totally discusses the influence of polytetrafluoroethylene (PTFE) to the property of room temperature vulcanization silicone rubber (RTV) pollution flashover coating, inclduding hydrophobic, corrosion resistance and heat resistance. It is turned out that the PTFE can effectively improve the corrosion resistance of the coating only if the contents of PTFE has no impact on the mechanical property, flame retaradant and heat resisting property of the coating and highly enhances the hydrophobicity property.

Abstract: The polymerization process and heat resistance of lactic acid-styrene-maleic anhydride copolymer was studied. Lactic acid-polystyrene-maleic anhydride copolymer was prepared with styrene, maleic anhydride and lactic acid by melt copolymerization. Its structure was characterized by Infrared Spectrum (IR), and the thermal properties were tested by Differential Scanning Calorimetry (DSC) and Thermo Gravimetric Analyzer (TGA). The paper research on the effect of the proportion of different monomer and the polymerization process on the heat resistance mainly. The optimum conditions for the synthesis were determined by means of experiment: the content of catalyst was 0.5(wt%), the ratio of styrene-maleic anhydride and lactic was 0.6g/10g, at 170 °C. for 5 h. The results showed that the glass transition temperature (T_g) of the copolymer increased by 26.0°C.and the 5% weight-loss temperature of it increased by 25.0°C compared with pure polylactic acid.

Abstract: The effect of thermal treatment conditions namely water pick-up, temperature and time on the morphological structure, bursting strength and wearabilities of polyester (PET) hollow staple fiber were investigated. The results show that changes in water pick-up, temperature and time may lead to an obvious change in bursting strength, warmth retention and water-vapor permeation of fabric. Scanning Electronic Microscope (SEM) analysis indicates that both thermal treatment temperature and time have a significant effect on the morphological structure and hollow structure, and the critical maximum time mostly depends on the applied temperature. Furthermore, the bursting strength, warmth retention and water-vapor permeation of polyester (PET) hollow staple fiber knitted fabric are determined by its morphological and hollow structure.

Abstract: Corn starch was irradiated by ⁶⁰Coγ ray, and then the thermoplastic starch plastic (TPS) was prepared by adding glycerol. Microstructure, thermal and mechanical properties of the corn starch and starch plastic were studied in details by FTIR, DSC and SEM. Results showed that the starch macromolecular structure was damaged by irradiation, and with increased irradiation time, the temperature of melt endothermic peak and tensile strength decreased, elongation at break increases for starch plastic, the thermoplastic property of starch was enhanced obviously.

Abstract: The TPS/LDPE starch plastic was prepared in the presence of the compatibilizer after the preparation of thermoplastic starch (TPS). The effect of starch content to properties of TPS/LDPE was studied by DSC, TG, electronic tensile machine and SEM. The results showed that the system had a good compatibility between TPS and LDPE, and the thermal properties were improved because of the forming of chemical bonds. When the TPS content is more than 58.54%, the tensile strength and elongation at break decreased dramatically, the main reason is the transformation of the continuous phase and the dispersed phase.

Abstract: This paper uses ANSYS10.0 to make modal analysis of the finite element models of the light steel frame. Set up two finite element analysis models with different stiffness of floor, one with the rigid floor assumption, another kind with the light steel floor,so as to research the influence of the calculation results of dynamic analysis. According to the analysis results,we can get that how to define the stiffness of floor is more accurate when design the light steel frame structure. So that to provide the theoretical basis for the designing of light steel frame constructions.