Polymer Engineering and Science articles from January 2002

Polymer Engineering and Science archives from January 2002

Interfacial crosslinking and diffusion via extensional rheometry.
January 1, 2002... Takushi Saito (*) When a coextruded muitilayer sheet Is pulled in a uniaxial extensional rheometer, the interfacial area per unit volume increases, amplifying interfacial effects. To investigate interfacial reaction, a pair of functional...

Oil resistant thermoplastic elastomers of nitrile rubber and high density polyethylene blends.(Statistical Data Included)
January 1, 2002... D. K. Setua (*) C. Soman (+) A. K. Bhowmick (+) Different grades of oil resistant thermoplastic elastomers (TPE) based on blends of nitrile rubber (NBR) and high density polyethylene (HDPE) have been developed. Chemical treatment...

A physical-mathematical model for the dispersion process in continuous mixers.
January 1, 2002... To modify the properties of polymers, mineral fillers are frequently added during the compounding process. Because of adhesive forces, these pulverized fillers tend to agglomerate. Therefore, in order to achieve good homogenization. it is...

A full 3D finite element analysis of the Powder Injection Molding filling process including slip phenomena.
January 1, 2002... T. H. Kwon (*) A full 3D finite element analysis system has been developed to simulate a Powder Injection Molding (PIM) filling process for general three-dimensional parts. The most important features of the analysis system developed In...

Characterization of the cure-state of DGEBA-DDS epoxy using ultrasonic, dynamic mechanical, and thermal probes.(Statistical Data Included)
January 1, 2002... S.R. White (a) P.T. Mather (b) M.J. Smith (c) Three experimental techniques were used to characterize the cure state of an epoxy resin system of DGEBA epoxide and DDS diamine curing agent. Samples were prepared from...

A new process for crosslinking thermoplastic polyurethanes using rubber industry techniques.
January 1, 2002... Stephanie Lambour (a,b) Francoise Mechin (a) Jean-Pierre Pascault (a) New polyurethane materials were obtained after chemical modification of a commercial thermoplastic polyurethane (TPU) using diisocyanates and diols or diamines....

Synthesis and characterization of ozonized polyethylene.(Statistical Data Included)
January 1, 2002... B. Boutevin (1) J.J. Robin (1)(*) N. Torres (2) J. Casteil (1) Polyolefins (LDPE and HDPE) can be ozonized with ozone/air gas flow to create peroxide and hydroperoxide groups on polymers. These reactive groups can be used to...

Percolation phenomena in polymers containing dispersed iron.(Statistical Data Included)
January 1, 2002... YE.P. Mamunya (*) YU.V. Muzychenko (**) P. Pissis (***) E.V. Lebedev (*) M.I. Shut (**) Metal-polymer composites based on polyethylene (PE), polyoxymethylene (POM), polyamide (PA) and a PE/POM blend as matrix and...

Polyimides from isomeric biphenyltetracarboxylic dianhydrides and the effects of chemical structure on solubility.(Statistical Data Included)
January 1, 2002... Y.J. Tong (1.2,*) S.L. Liu (1) H.M. Guan (2) M.X. Ding (3) A series of homopolyimides and copolyimides was synthesized by the solution condensation of biphenyltetracarboxylic dianhydride (BPDA) isomers and various diamines...

Study on the residual wall thickness at dimensional transitions and curved sections in gas-assisted molded circular tubes.
January 1, 2002... S.Y. Yang (*) Plastic tubes and hollow rods can be fabricated using gas-assisted injection molding technology with reduced cost. The residual wall thickness around dimensional transitions and curved sections is of great concern. This...

Morphology and rheology relationships of epoxy/core-shell particle blends.
January 1, 2002... Boi Huyen Nguyen-Thuc (1,2) Abderrahim Maazouz (1) (*) The morphological and rheological behaviors of toughened epoxy resins modified with core-shell rubber particles (CSR) were studied. These rubber particles were based on a poly...

Investigation of structure development in polyamide 11 and polyamide 12 tubular film extrusion.
January 1, 2002... The processability of single bubble polyamide 11 and polyamide 12 films was investigated. The development of crystalline structure and chain orientation of polyamide 11 and polyamide 12 films in single bubble film blowing was studied by...

The effect of flame retardants on the hot-plate welding of talc-filled polypropylene.
January 1, 2002... M.J. Oliveira (*) C.A. Bernardo (*) D.A. Hemsley (+) The effect of a flame retardant on the weldability of polypropylene with two different talc loadings was studied by microscopy and mechanical tests on hot-plate welded Injection...

A microscopy study of the transition from yielding to crazing in polypropylene.
January 1, 2002... D.J. Van Dijk (*) The deformation mechanisms in polypropylene as a function of strain rate have been studied by scanning electron microscopy. Injection molded, dogbone specimens were tested in tension at a temperature of 50[degrees]C and...

Prediction of the creep of heterogeneous polymer blends: Rubber-toughened polypropylene/poly(styrene-co-acrylonitrile).
January 1, 2002... Jan Kolarik (*) A previously proposed predictive format for elastic, storage and loss moduli is extended for the time-dependent compliance [D.sub.b](t) of polymer blends. The format employs a two-parameter equivalent box model (EBM) and...

An optical device to measure in-line residence time distribution curves during extrusion.
January 1, 2002... Sebastiao V. Canevarolo (*) This paper proposes a setup for In-line measurement of residence time distribution (RTD) curves during extrusion. The detection system is composed of a slit die with transparent borosilicate glass windows fixed...

Measurement of the residual mechanical properties of crazed polycarbonate. I: Qualitative analysis.
January 1, 2002... Stephen B. Clay (*) A new technique to quantify the bulk craze density of transparent plates was used to characterize the craze growth behavior of polycarbonate at various stress levels. The craze growth rates were found to exponentially...

Measurement of the residual mechanical properties of crazed polycarbonate. II: Design of experiments analysis.
January 1, 2002... Stephen B. Clay (*) The Design of Experiments (DOE) approach was used to build quantitative empirical models of the residual mechanical properties of crazed polycarbonate as functions of relative craze density, crazing stress, and strain...

Flow behavior of stratified viscoelastic laminar flow at junctions with different angles.
January 1, 2002... Detailed study was carried out in order to investigate flow phenomena occurring at the junction of two incoming stratified flow layers with junction angles. Various combinations of fluids with Newtonian and non-Newtonian rheological...

Simulation of non-isothermal melt densification of polyethylene in rotational molding.
January 1, 2002... C.T. Bellehumeur (1) Rotational molding involves powder mixing, heating and melting of powder particles to form a homogeneous polymer melt, as well as cooling and solidification. The densification of a loose powder compact into a...

Modeling of a Buss-Kneader as a polymerization reactor for acrylates. Part I: Model validation.
January 1, 2002... L.P.B.M. Janssen (*) The Buss-Kneader is generally known as a compounding device. Although a reasonable number of papers have been published on extruders as polymerization reactors, only little is known about the behavior of the...

Modeling of a Buss-Kneader as a polymerization reactor for acrylates. Part II: Methyl methacrylate based resins.
January 1, 2002... L.P.B.M. Janssen (*) The Buss-Kneader has proven to be a suitable reactor for the polymerization of aclylates. In this second part, the polymerization of methyl methacrylate and the ter-polymerization of methyl methacrylate (MMA),...