Polymer Engineering and Science articles from December 2006

Polymer Engineering and Science archives from December 2006

Nanoreinforcement of flexible epoxy using layered silicate.
December 1, 2006... INTRODUCTION Use of reinforced plastic composites has increased tremendously over the last two decades and this dramatic growth is showing every sign of continuing in the future. Inorganic fibers and particulate fillers are generally used...

Interfacial characteristics of film insert molded polycarbonate film/polycarbonate-acrylonitrile-butadiene-styrene substrate, Part 1: influence of substrate molecular weight and film thickness.
December 1, 2006... INTRODUCTION Film-insert injection molding (FIM) is a relatively new and highly effective method for the application of printed materials onto injection molded parts, e.g. labels for mobile phones, decorative films on food trays, etc.,...

Solid state [.sup.19.F] NMR study of crystal transformation in PVDF and its nanocomposites.(polyvinylidene fluoride)
December 1, 2006... INTRODUCTION Polymer nanocomposites represent a new breed of materials with ultra fine phase (e.g. clay) dispersion of the order of a few nanometers. This endows them with unique properties which offer new technological and economic...

Investigation of melt manipulation phenomena during injection molding via in situ birefringence observation.
December 1, 2006... INTRODUCTION Vibration-assisted injection molding (VAIM) is one of several processes that seek to enhance the properties of injection molded articles by manipulation of the polymer melt within the mold cavity. Previous studies have shown...

Recycling of high impact polystyrene in coextruded sheet: influence of the number of processing cycles on the microstructure and macroscopic properties.
December 1, 2006... INTRODUCTION High impact polystyrene (HIPS) is one of the most widely used thermoplastics, especially in those products where brittle polystyrene (PS) can not be used. HIPS can be structurally defined as a multiphase system that exhibits a...

The effect of screw geometry on melt temperature profile in single screw extrusion.
December 1, 2006... INTRODUCTION Effective screw design is of paramount importance for optimization of the extrusion process. Screw geometry directly affects extruder throughput, rate of melting, mixing, melt temperature homogeneity, and process efficiency....

Comparison of elastic and tactile behavior of human skin and elastomeric materials through tribological tests.
December 1, 2006... INTRODUCTION Ageing is a physiological mechanism associated with changes in skin morphology and mechanical properties, including dry state, and anisotropy of the skin relief. Moreover, cosmetic products induce tactile changes of the skin...

Dielectric properties of [gamma]-irradiated POE highly filled with aluminum hydroxide.(Polyethylene-octene elastomer)
December 1, 2006... INTRODUCTION Polyethylene-octene elastomer (POE), a metallocene-based polyolefin, is a commercially important elastomer widely used in applications such as wire and cable insulation, foamed sheets, automotive parts, durable goods,...

Multiplex shear stress-induced nucleation in dynamic microcellular foaming process.(Microcellular plastics )(Report)
December 1, 2006... INTRODUCTION Microcellular plastics have many superior physical and mechanical properties compared with the conventional foam plastics because of their unique cell morphology [1]. Microcellular plastics are usually characterized by the...

Comparison of the effect of epoxy microspheres on the thermomechanical and rheological properties of an epoxy resin system.
December 1, 2006... INTRODUCTION Modification of epoxy-based materials by the inclusion of additives is a well-known method for improving their physical properties [1-3]. Usually, low modulus thermoplastic or elastomeric particles are used to increase...

Preparation and properties of the self-crosslinked acrylic rubber via gamma ray initiated emulsion polymerization.
December 1, 2006... INTRODUCTION It is well known that acrylic rubber has many specific properties such as lower cost, superior oil resistance, higher working temperature, and so on, because of the polar branch groups on the saturated main chains [1-4]....

Radical mediated graft modification of polyolefins: vinyltriethoxysilane addition dynamics and yields.
December 1, 2006... INTRODUCTION The radical-mediated grafting of vinyltriethoxysilane (VTEOS) to polyethylene transforms this commodity material into a reactive derivative that is capable of moisture-curing and bonding covalently with siliceous fillers [1]....

Superabsorbent composite. X. effects of saponification on properties of polyacrylamide/attapulgite.(Report)
December 1, 2006... INTRODUCTION Superabsorbents are crosslinked hydrophilic polymers that can absorb a large amount of water and the water absorbed is hardly removable even under some pressure. Because of superior properties to traditional absorbents (such...

Injection molding of syndiotactic polystyrene/clay nanocomposites.
December 1, 2006... INTRODUCTION In the last years, syndiotactic polystyrene (sPS) has received considerable attention because of its high melting temperature, fast crystallization rate, low dielectric constant, and good chemical resistance. Structural...

Partially hydrolyzed kappa carrageenan--polyacrylonitrile as a novel biopolymer-based superabsorbent hydrogel: synthesis, characterization, and swelling behaviors.(Report)
December 1, 2006... INTRODUCTION In recent years, increasing interest in natural based superabsorbent hydrogels has developed mainly due to high hydrophilicity, biocompatibility, non toxicity, and biodegradability of biopolymers. These materials are defined...

Constitutive modeling for intercalated PMMA/clay nanocomposite foams.(Report)
December 1, 2006... INTRODUCTION Recently, a great deal of interest has been focused on the polymer/clay nanocomposites (PCNs) and nanocomposite foams. Polymer nanocomposites contain nanometer scale fillers in the polymer matrix and have shown improved...

A novel fabrication method for the mold insert of microlens arrays by hot embossing molding.
December 1, 2006... INTRODUCTION In recent years, micro-optical products such as microlenses and microlens arrays have attracted significant interest for optical communication, optoelectronics and biomedical applications, including image capture systems,...

Rheokinetics of ring-opening metathesis polymerization of norbornene-based monomers intended for self-healing applications.
December 1, 2006... INTRODUCTION Thermosetting polymers and their composites, while used in a wide variety of applications, are susceptible to cracking damage of various forms (e.g., matrix microcracking, interlaminar fracture, fiber-matrix debonding)....

Natural rubber-polyurethane block copolymers: nonlinear structural variations with NCO/OH ratio.
December 1, 2006... INTRODUCTION Segmented polyurethane elastomers are block copolymers having alternate polyurethane hard segments and different types of soft segments which are derived generally from polydienes. Their physical properties are usually...