- Mathematical modelling of melt grafting reactions in
twin screw extruders.
This paper examines the modelling of melt grafting of glycidyl methacrylate onto polyethylene in a modular, intermeshing co-rotating twin screw extruder. Mathematical results are compared to values obtained by experimentation. Chemical modification of existing polymers with functional monomers has been a topic of vigorous research activity in recent years, resulting ......
- Software eases web-gauge control.
A new mathematical model from Eurotherm's Gauging Group in Billerica, Mass., can make diebolt mapping--normally a hands-on, engineering-intensive process--almost as easy as hitting a few computer keys. Introduced just this month, the model is the latest in a progression of software improvements to CIMLine, the company's computer-integrated manufacturing package for ......
- Mathematical modelling in glass melting technology.
(Melting Technology).
Modelling procedures play an important role in the investigation of glass melting technology and furnace design. The first stage of mathematical modelling involved various calculations of heat and mass balance of the glass furnace. These 'balance models' are still used in practical furnace engineering or as a particular procedure in ......
- Volume thermoplastics to challenge higher-cost
'engineering' resins.
Volume Thermoplastics To Challenge Higher-Cost 'Engineering' Resins Much like engineering resins, developments in high-volume or "commodity" thermoplastics in the 1990s will hinge on new copolymer and alloy technologies. The results will be especially apparent in polyolefins. With new ways of making higher-performance, "engineering-level" grades, commodity thermoplastic producers say their materials ......
- Titanium pyridyl-phosphinimide complexes--synthesis, structure, and ethylene polymerization catalysis.
Abstract: A series of Ti-pyridyl-phosphinimide complexes of the form Cp'Ti[X.sub.2][[NP[R.sub.2](2-C[H.sub.2]Py)] (Cp' = Cp, Cp*, R = i-Pr, t-Bu, X = Cl, Me) have been prepared and characterized. These complexes generate ethylene polymerization catalysts upon activation with MAO or B[([C.sub.6][F.sub.5]).sub.3]. The resulting polymers exhibit broad molecular weight distributions. The role of ......
- First technical details on some next-generation
polyolefins.
A new palette of ethylene copolymers made by a patented "constrained-geometry" metallocene catalyst system is being produced in developmental quantities by Dow Plastics in Freeport, Texas. Described in Dow's 58-page patent as pseudo-random ethylene/styrene copolymers with up to 50% styrene content, the new materials are the first such copolymers of ......
- Applied Research Centre for
Polymers.
Applied Research Centre for Polymers/Centre de recherche appliquee sur les polymeres The Applied Research Centre for Polymers (Centre de recherche appliquee sur les polymeres, CRASP), established at Ecole Polytechnique in the summer of 1988, groups the research activities of 11 professors, four research associates and six research engineers from the ......