we chose Sn10Bi, Sn10Bi10In, Sn20Bi, and Sn20Bi20In (numbers are in weight percent) rapidly solidified from melt using melt-spinning technique for intermediate –step soldering. We then investigated the structure, electrical and mechanical properties of the melt-spun ribbons using x-ray diffraction, double bridge circuit, dynamic resonance technique, and Vickers microhardeness tester. It was con...

used pet bottles disposal is an unsolved environmental problem, and there are many efforts for finding an applicable solution for it. many researches have showed that the degradation rate of the polymers increase with the smaller size of fibers. this work was carried out to convert used pet bottles into nanofibers by melt-electrospinning method. uncolored, washed and chipped pet bottles and the...

An optimal control problem for a mathematical model of a melt spinning process is considered. Newtonian and non–Newtonian models are used to describe the rheology of the polymeric material, the fiber is made of. The extrusion velocity of the polymer at the spinneret as well as the velocity and temperature of the quench air serve as control variables. A constrained optimization problem is derive...

Carbonaceous mesophases are liquid crystalline precursor materials that can be spun into high performance carbon fibers using the conventional melt spinning process. Carbon fiber property optimization requires a better understanding of the principles that control the structure development during the fiber formation processes and the rheological processing properties. This work presents the elas...