Process aspects of production of polyester textile fibres

Some aspects of high-speed spinning of polyester textile fibres that affect the technology level and product quality are examined. It was shown that uniformity of the melt, extrusion, and cooling of the filaments are the most important process factors in modern plants. Addition of polymer dye concentrates (PDC) (MB) results in physical modification of the polyester fibres that affect the structure formation and deformation properties of POY. This makes it necessary to correct the process parameters of the fibre production process.     

Technological aspects of fabrication of microfibres. A review

It was shown that in selecting the parameters for high-speed spinning of microfibres, it is necessary to consider the rheological factors that affect extrusion and stretching of the filaments. Technological schemes for fabrication of polyester microfibres are examined. Translated from Khimicheskie Volokna, No.5, pp. 13–17, September–October, 1998.     

Edward A. Feigenbaum and Julian Feldman,eds., Computers and Thought

Minds and Machines -     

Electroluminescence from silicon nanoparticles fabricated from the gas phase

Electroluminescence from as-prepared silicon nanoparticles, fabricated by gas phase synthesis, is demonstrated. The particles are embedded between an n-doped GaAs substrate and a semitransparent indium tin oxide top electrode. The total electroluminescence intensity of the Si nanoparticles is more than a factor of three higher than the corresponding signal from the epitaxial III-V semiconductor. This, together with the low threshold voltage for electroluminescence, shows the good optical properties of these untreated particles and the efficient electrical injection into the device. Impact ionization by electrons emitted from the top electrode is identified as the origin of the electrically driven light emission.     

Kinetic and Thermodynamic Aspects of Modification of the Composition of Fibre-Forming Acrylonitrile Copolymers

The possibility of synthesizing poly(AN-co-VA-co-AMPS) fibre-forming copolymer in a 51.5% aqueous solution of sodium thiocyanate is demonstrated. Slowing of the rate of polymerization occurs when MAA is replaced by its isomeric analog VA as a result of pseudostabilization by the VA units of active free-radical polymerization sites.