Showing papers by "Semyon Vaynman published in 1995"
TL;DR: In this paper, structural properties of eutectic Sn-Ag and Sn-Zn solders are investigated as the basis for replacement of Sn-Pb solders.
Abstract: Eutectic Sn-Ag and Sn-Zn solders are currently being investigated as the basis for replacement of Sn-Pb solders. Some mechanical properties of these solder systems - fatigue, tensile, stress relaxation and creep are presented here along with some damage feature observations for eutectic Sn-Ag solder. Semi-empirical modeling, constitutive modeling and numerical simulation based on damage models have been carried out for lifetime prediction. Preliminary agreement of this numerical simulation with experimental results appears encouraging, but the models need further refinement.
26 citations
TL;DR: In this paper, a range of polyelectrolytes containing weakly basic aluminosilicate anions in the polymer backbone were synthesized and characterized to achieve t+ = 1 and high ionic mobility.
Abstract: We have synthesized and characterized a range of novel polyelectrolytes containing weakly basic aluminosilicate anions in the polymer backbone in order to achieve t+ = 1 and high ionic mobility. Room-temperature conductivity is observed to increase in the series: (NaAl(OEOMe)2)(((OE)xO)2/2)n < (NaAl(OR)2(OSiMe2(CH2) 3(OE)xO(CH2)SiMe2O)2/2)n < (NaAl(OSiR3) (OSiMe2(CH2)3(OE) xO(CH2)3SiMe2O)3/2)n. This trend is ascribed to reduced ion pairing due to decreasing anion basicity, and lowered Tg resulting from increasing siloxy character. The addition of cryptand (2.2.2) increases conductivities by 1 - 1.5 orders of magnitude. A maximum room-temperature conductivity is observed at a ratio of approx. equal 10 etheric oxygens/cation. Related lithium polymer electrolytes were evaluated in mechanically joined solid state Li(PE)(LixMn2O4-C-PE) cells.