Polymer Engineering and Science articles from October 2003

Polymer Engineering and Science archives from October 2003

Fracture behavior of core-shell rubber-modified clay-epoxy nanocomposites.
October 1, 2003... Morphology and fracture mechanisms in two nanoclay-filled epoxy systems were investigated using both microscopy and spectroscopy tools. Clay exfoliation was achieved using a series of sample preparation steps, and confirmed using wide angle...

Influence of post-extrusion parameters on the final morphology of polystyrene/high density polyethylene blends.
October 1, 2003... The deformation of the dispersed phase in polystyrene/high density polyethylene (PS/HDPE) blends produced by ribbon extrusion was studied numerically and experimentally. A mathematical model for the deformation of the dispersed phase in ribbon...

Compensating for die swell in the design of profile dies.
October 1, 2003... Because of the effects of die swell, the final shape of an extrudate is often substantially different from that of the exit opening of the die. As a result, the design of profile dies producing complex shapes often involves more than just...

Preparation of starch-graft-polyacrylamide copolymers by reactive extrusion.
October 1, 2003... Graft copolymers of starch and polyacrylamide (PAAm) were prepared by reactive extrusion using a co-rotating twin-screw extruder and ammonium persulfate initiator. Feed rates were 109 g/min to 325 g/min (all components) at a moisture content of...

Characterization of fractionated phenolic resins used in photoresists.
October 1, 2003... Novolak resins fractionated using a liquid/liquid centrifugal fractionation/separation technique were characterized and contrasted to resins fractionated by conventional methods. The new fractionation method resulted in higher yields of resins...

Layered silicate nanocomposites based on various high-functionality epoxy resins. Part II: the influence of an organoclay on the rheological behavior of epoxy prepolymers.
October 1, 2003... The effect of an organically surface modified layered silicate on the viscosity of various epoxy resins of different structures and different functionalities was investigated. Steady and dynamic shear viscosities of the epoxy resins containing...

Super-toughness in compatibilized poly(butylene terephthalate)/poly(ethylene-octane) copolymer blends.
October 1, 2003... Poly(butylene terephthalate) (PBT)/poly(ethylene-octane) (PEO) blends containing 1.0 wt% epoxy and from 0 to 30 wt% PEO were obtained by extrusion and injection molding. The blends were composed of two pure amorphous phases. The observed torque...

Fracture toughness evaluation of polytetrafluoroethylene.
October 1, 2003... The objective of this preliminary work was to explore the fracture resistance of polytetrafluoroethylene (PTFE) (DuPont tradename Teflon) as part of materials characterization work related to the development of "reactive" material projectiles....

Melting model for intermeshing counter-rotating twin-screw extruders.
October 1, 2003... Previous experimental studies of melting of pellets in an intermeshing counter-rotating twin-screw extruder have shown that melting is initiated both between the screws and at the barrel. Models are developed for melting in both those regions....