Polybutadiene and a co poly mer consisting of 76.5 percent butadiene and 23 .5 percent of styrene were investigated as to t he rates of t heir t hermal degradation . The ra tes for polybu tadiene indicated an act iv:ttion energy of 60 kilocalories per mole. The copolym er had very high init ial rates of degradation, followed by a rapid cirop, so t hat it wa~ not possible to obtain a reliab le a...

It is mainly the bulk properties of latex and ink oil that contribute to the observable differences in the ink setting dynamics rather than surface chemical wetting differences or changes in porous structure related to the inclusion of latex. It can be generalised that low latex solubility parameter (butadiene < styrene = acrylate < acrylonitrile) leads to greater oil interaction. Furthermore, ...

MATERIALS AND METHODS: Using open-source CAD modeling software, we developed a customizable prosthetic eye model. The eye can be customized within the following parameters: shape, height, length, width, thickness, concavity, iris diameter, and pupil diameter. The customization process is user friendly, requiring numeric inputs or parametric adjustments. The final model is exported and processed...

The e€ects of ultra-violet irradiation on the microstructure of an oxygen free polymer viz., acrylonitrile-butadiene-styrene and a polymer containing oxygen viz., polycarbonate have been investigated using positron annihilation lifetime measurement. Lifetime results in both polymers in the early stages of irradiation indicate that chain-scission leading to free radical formation is the predomin...

In order to develop a polycarbonate (PC)/ acrylonitrile-butadiene-styrene (ABS) product with a high content of recycled PC, a low molecular weight virgin PC was added to recycled PC to minimize batch-to-batch property variations in the compounded product. Six PC/ABS blends were prepared on a twin screw extruder by mixing 50 wt% virgin ABS and 0-25 wt% low molecular weight virgin PC with 25-50 w...