1,175 research outputs found
AC Impedance and FTIR Studies of PVA-ZnCl2 Based Solid Polymer Electrolytes
Solid Polymer electrolytes (SPEs) comprising of poly(vinyl alcohol) (PVA)added Zinc chloride (ZnCl2) systems have been prepared via solvent castingtechnique. The prepared samples have been subjected to AC impedancespectroscopic analysis and Fourier Transform Infrared Spectroscopy (FTIR)studies. Maximum ionic conductivity of 3.91949*10-7 Scm-1 was achievedfor 60 wt% of PVA and 40wt% of ZnCl2 system at room temperature.The structural changes and hence the complex formation between theconstituents used in the present study has been confirmed through FTIRanalysis
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Dimensional Issues in Stereolithography
New stereolithography photopolymers have recently been introduced that provide a wider
range of functional properties similar to those of high-density polyethylene. One of the
important criteria for these materials is the dimensional accuracy and stability in end-use
applications as mold masters or the actual functional parts. This work investigates the
dimensional stability of one of these new materials with varying amounts of exposure during
build. The effect of aging on the part dimensions is reported. The result of environmental
humidity extremes at ambient temperature on part dimensions is investigated and compared for
parts made from two different families of stereolithography resins, namely DuPont Somos® 7100
and Somos® 8100.Mechanical Engineerin
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