Polymer Engineering and Science articles from April 2003

Polymer Engineering and Science archives from April 2003

The effect of sample preparation on the mechanical properties of Nylon 66.
April 1, 2003... Cutting test specimens from molded plaques is commonly used in mechanical testing. The mechanical properties of these cut specimens may be affected by cutting process as it could introduce extrinsic flaws and thermal effects on cut edge...

Functionalization of high density polyethylene with maleic anhydride in the melt state through ultrasonic initiation.
April 1, 2003... Grafting of maleic anhydride (MAR) onto high density polyethylene (HDPE) performed in the melt state through ultrasonic initiation by a laboratory-scale ultrasonic extrusion reactor was studied in this paper. The effect of sonic intensity on...

Chaotic Volumetric transports in a single-screw extrusion process.(polymers )
April 1, 2003... Volumetric material transports across distinct regions in the Chaos Screw (CS) system were described in terms of the volume-preserving lobe dynamics. Kinematic properties of a spatially periodic Poincare map were studied first with the...

Influence of the relative humidity on film formation by vapor induced phase separation.(polymers)
April 1, 2003... The formation of polymer films produced by the phase separation process occurring when a cast poly(etherimide)/N-Methyl-2-Pyrrolidone solution was exposed to humid air was studied. It was found that above a relative humidity value of 27%, the...

Recycling of roofing membrane rubber by ultrasonic devulcanization.
April 1, 2003... The recycling of vulcanizates based on EPDM roofing membrane rubber using a new ultrasonic devulcanization reactor with a grooved barrel was carried out. This reactor provided continuous devulcanization at an output as high as 2.52 g/s. Die...

Flexible polymer composite electromagnetic crystals.
April 1, 2003... The dielectric properties of a ceramic powder ([BaTiO.sub.3]) filled thermoplastic elastomer (EPDM TPE) were investigated for use in a flexible electromagnetic crystal. Materials were produced that had a high dielectric constant (approximately...

Structure and properties of oriented Polyethylene films.
April 1, 2003... Cast films of a metallocene Linear Low Density Polyethylene (mLLDPE) have been cold-drawn in the machine direction in two sequential steps to form ultra-oriented films. The Initial films were cast under low shear conditions to form essentially...

Layered silicate nanocomposites based on various high-functionality epoxy resins: the influence of an organoclay on resin cure.
April 1, 2003... The influence of an organically modified clay on the curing behavior of three epoxy systems widely used in the aerospace industry and of different structures and functionalities was studied. Diglycidyl ether of bisphenol A (DGEBA), triglycidyl...

Cure kinetics, gelation, and glass transition of a bisphenol F epoxide.
April 1, 2003... Phenomenological cure kinetic relations for a commercially available amine-cured epoxy were developed Independently using differential scanning calorimetry (DSC) in isothermal and dynamic (constant heating rate) modes and using numerical...

Mixing dynamics in the SMX static mixer as a function of injection location and flow ratio.
April 1, 2003... A detailed Lagrangian analysis of partially mixed structures in an SMX static mixer is presented, with emphasis on laminar flows with Reynolds numbers between 1 and 100. The distribution of a small amount of equal-viscosity additive is examined...

Erosion and breakup of polymer drops under simple shear in high viscosity ratio systems *.
April 1, 2003... The deformation and breakup of a single polycarbonate (PC) drop in a polyethylene (PE) matrix were studied at high temperatures under simple shear flow using a specially designed transparent Couette device. Two main breakup modes were observed:...

An investigation into the relationship between the impact performance of rotationally molded polyethylene products and their dynamic mechanical properties.
April 1, 2003... In this paper, a study of the relationship between the impact performance of rotationally molded polyethylenes and their dynamic mechanical properties is carried out. A wide range of conventional linear low density polyethylene powders and...

Electrochemically synthesized polythiophene films with self-organized microstructure.
April 1, 2003... The microstructure of electronically conducting polythiophene (Pth) films synthesized electrochemically was studied using a scanning electron microscope. A self-organization phenomenon was observed in the films, which grew on a substrate with...

UV fluorescence monitoring of the mixing of molten polymers in a batch mixer.
April 1, 2003... A fluorescence monitoring device was developed to study the distributive mixing process inside the chamber of a batch mixer. A bifurcated UV-fluorescence probe was implemented instead of the thermocouple measuring the temperature of the melt....

Effectiveness of functionalized polyolefins as compatibilizers for polyethylene/wood flour composites.
April 1, 2003... The effects of various types of compatibilizers on the mechanical properties of high-density polyethylene/wood flour (HDPE/WF) composite were investigated. Functionalized polyolefins such as maleated and acrylic acid grafted polyethylenes,...

The effect of annealing on the nonlinear viscoelastic response of isotactic polypropylene.
April 1, 2003... Three series of tensile relaxation tests are performed on isotactic polypropylene at room temperature in the vicinity of the yield point. In the first series of experiments, injection-molded samples are used without thermal pre-treatment. In...

Compatibilizers based on polypropylene grafted with itaconic acid derivatives. Effect on polypropylene/polyethylene terephthalate blends.
April 1, 2003... New types of compatibilizers based on functionalized polypropylene (PP) were synthesized by radical melt grafting either with monomethyl itaconate or dimethyl itaconate. The effect of these new modified PP compounds were tested as...

Tyrosine imprinted polymer beads with different functional monomers via seed swelling and suspension polymerization.
April 1, 2003... Molecularly imprinted polymers (MIPs) in bead form were prepared by seed swelling and suspension polymerization with trimethylolpropane trimethacrylate (TRIM) as crosslinker arid tyrosine as template. The appearance of the beads was found to be...

Rheological and viscoelastic properties of multiphase acrylic rubber/fluoroelastomer/polyacrylate blends.
April 1, 2003... Dynamic viscoelastic properties and dynamic mechanical properties of blends of acrylate rubber (ACM), fluoroelastomer and polyacrylate plastics have been investigated with a rheometer (ARES RDA III) at a frequency [omega] range of 0.1 to [100...

Erratum.(Abstract)
April 1, 2003... "Scratch Visibility of Polymers Measured Using Optical Imaging," by P. Rangarajan, M. Sinha, V. Watkins, K. Harding, and J. Sparks: Polym. Eng. Sci., 43, 749-58 (March 2003). The OS-Background Intensity for the White ABS sample in Table 2...