Polymer Engineering and Science articles from December 2003

Polymer Engineering and Science archives from December 2003

Melt strength and extensibility of talc-filled polypropylene.
December 1, 2003... 1. INTRODUCTION Polypropylene is a widely used commodity thermoplastic polymer, which as a result of its favorable properties is increasingly finding uses in new products for a variety of applications. The properties of PP can also be...

Methyl methacrylate modification of polyolefin in a batch mixer and a twin-screw extruder experiment and kinetic model.
December 1, 2003... INTRODUCTION In recent years reactive extrusion has become an important area of polymer processing. There have been two distinct thrusts in reactive extrusion. One has involved polymerization of monomer to form homopolymer or linear...

A study of residence time distribution in co-rotating twin-screw extruders. Part I: theoretical modeling.
December 1, 2003... INTRODUCTION Residence time distribution (RTD) usually describes the time history of a fluid inside a reactor (1, 2). As the trajectories and the velocities along these trajectories are usually different for the particles, the residence...

A study of residence time distribution in co-rotating twin-screw extruders. Part II: experimental validation.
December 1, 2003... INTRODUCTION In the first part of this work (1), a new method for calculating the residence time distribution (RTD) in a twin-screw extruder was proposed. By combining a thermomechanical with a chemical engineering approach, the behavior...

Rheology and extrusion of medical-grade thermoplastic polyurethane.
December 1, 2003... INTRODUCTION Thermoplastic polyurethanes (TPU), which are composed of alternating soft and hard segments along a high molecular weight polymeric backbone, are very versatile polymers with a wide range of applications. The versatility of...

Quantitative determination of short-chain branching content and distribution in commercial polyethylenes by thermally fractionated differential scanning calorimetry.
December 1, 2003... INTRODUCTION Polyethylenes synthesized by the copolymerization of ethylene and [alpha]-olefins with either Ziegler-Natta or metallocene catalysts are major commodity polymers worldwide. The properties, and hence the end uses, of commercial...

Crystallization of poly(butylene terephthalate).
December 1, 2003... INTRODUCTION Poly(butylene terephthalate) (PBT) is a thermoplastic polyester widely used for its good mechanical and thermal properties, especially to produce injection molded and extruded articles as well as matrices for glass fiber...