Polymer Engineering and Science articles from December 2007

Polymer Engineering and Science archives from December 2007

Triboelectrostatic separation of covering plastics in chopped waste electric wire.(Technical report)
December 1, 2007... INTRODUCTION Nowadays, the generation of waste electric wire such as power transmission cable, control cable, transport cable, communication cable used in the electric power, electronics, and communication industries is constantly...

Molecular, rheological, and crystalline properties of low-density polyethylene in blown film extrusion.(Technical report)
December 1, 2007... INTRODUCTION Low-density polyethylene (LDPE) is manufactured using a high pressure process that produces long chain branching. It is used in the food packaging industry because of its high clarity, flexibility, impact, toughness, and its...

Stretching induced phase transformations in melt extruded poly(vinylidene fluoride) cast films: effect of cast roll temperature and speed.(Technical report)
December 1, 2007... INTRODUCTION Poly(vinylidene fluoride) (PVDF) is a semi-crystalline polymer and has four crystal polymorphs, referred to as [alpha], [beta], [gamma], and [delta]. The conditions during melt processing of PVDF determine the type of crystal...

Miscibility and crystallization kinetics of poly(trimethylene terephthalate)/amorphous poly(ethylene terephthalate) blends.(Technical report)
December 1, 2007... INTRODUCTION Crystallization kinetics of melt-miscible blends of crystalline and amorphous polymers has been extensively studied [1-15]. When crystallization occurs below the melting point of the crystalline component, the process involves...

Effects of surface roughness on microinjection molding.(Technical report)
December 1, 2007... INTRODUCTION Injection molding is one of the most common processes for cost-effective mass production of microplastic parts. Many researchers have carried out extensive numerical and experimental analysis on the optimization of the...

Ultraporous 3D polymer meshes by low-temperature electrospinning: use of ice crystals as a removable void template.(Technical report)
December 1, 2007... INTRODUCTION Electrospun polymer meshes have received significant attention in the last few years and strongly contributed to the development of advanced biomaterials for tissue engineering [1, 2], wound dressing [3], and drug delivery...

Study on epoxy/thermoplastic blends based on the addition of a novel aromatic block copolymer.(Technical report)
December 1, 2007... INTRODUCTION The addition of thermoplastics into thermoset has been widely recognized as an alternative to rubber toughening in order to improve the brittleness of epoxy networks without a significant decrease of desirable properties such...

The effect of polyvinylidene fluoride on nonisothermal crystallization behavior of polyoxymethylene.(Technical report)
December 1, 2007... INTRODUCTION In the molding process of polymers, crystallization is a universal phenomenon, especially for polymers with regular molecular chains. Differences of crystallinity, crystal structure, and morphology will influence the...

The effect of epoxy-polyester hybrid resin on mechanical properties, rheological behavior, and water absorption of polypropylene wood flour composites.(Technical report)
December 1, 2007... INTRODUCTION Wood plastic composites (WPCs) have found technical and marketing succession in many applications [1]. Their superior advantages such as outdoor durability and weather resistance, imperviousness to moisture, low maintenance,...

Effect of fill factor and validation of characterizing the degree of mixing in polymer nanocomposites.(Technical report)
December 1, 2007... INTRODUCTION Although nanofillers have been used for some time, the achievements reported in polyamide-6 (PA-6)/clay nanocomposites by the Toyota research group in the early 90s' sparked research on polymer nanocomposites [1-3]. Following...

Transport characteristics of carboxylic acids based chain extended PU membranes with n-alkane penetrants.(polyurethanes)(Technical report)
December 1, 2007... INTRODUCTION Nowadays the polymer membranes are increasingly used in various barrier applications. Molecular transport of organic liquids through polymer membranes has been the subject of investigations over the past several years [1-6]....

Exploitation of electric field in controlling of nanofiber spinning process.(Technical report)
December 1, 2007... INTRODUCTION Nanotechnology is a promising technology in the fiber industry. Nanofibers (referring here to all submicron sized fibers) can be used, for example, in filtration, biomedical applications, polishing cloths, reinforcing,...

Through-thickness embossing process for fabrication of three-dimensional thermoplastic parts.(Technical report)
December 1, 2007... INTRODUCTION The standard hot embossing process is designed for imprinting surface features onto polymer substrates [1, 2]. The substrate is relatively thick as compared with the feature size. During the process a heated embossing master,...

Modeling of dynamic mechanical properties of vulcanized fluoroelastomer.(Technical report)
December 1, 2007... INTRODUCTION To use a material in different engineering applications, particularly in the areas where the product is subjected to high vibration and pulsating loads, one should understand its mechanical properties under rapidly varying...

Preparation and characterization of bis-ortho-diynylarene (BODA)-derived submicrogratings.(Technical report)
December 1, 2007... INTRODUCTION Thermally initiated cyclo-rearrangements of enediynes have been reported by Bergman [1]. This study focuses on the preparation of new carbon materials from bis-ortho-diynylarene (BODA) monomers, which also undergo thermal...

Influence of screw profile and extrusion conditions on the microstructure of polypropylene/organoclay nanocomposites.(Technical report)
December 1, 2007... INTRODUCTION Melt intercalation is one of the most promising techniques for preparing polymer/organoclay nanocomposites, during which the organoclay is dispersed within the polymer in the melting state [1, 2]. If different processing...

Stress-strain behavior as related to surface topography and thickness uniformity in uni- and biaxially stretched PVDF/PMMA blends.(polyvinylidene fluoride, polymethyl methacrylate)(Technical report)
December 1, 2007... INTRODUCTION In film manufacturing processes, surface smoothness and thickness uniformity are two important parameters [1, 2]. It has been found in open publications that there are only a few articles on correlation of mechanical...

Nitroxide-mediated controlled degradation of polypropylene.(Technical report)
December 1, 2007... INTRODUCTION Polypropylene (PP) is one of the most commonly used materials in the plastics industry. PP resins are being produced for a very broad range of end use applications. For that purpose, the molecular architecture of these resins...

Shrinkage behavior and mechanical performances of injection molded polypropylene/talc composites.(Technical report)
December 1, 2007... INTRODUCTION The quality of injection molded parts is depended on the type of processing raw material, part, and mold design specifications as well as the processing conditions. By appropriate incorporation of additives into a polymer...

Nonisothermal finite-element analysis of thermoforming of polyethylene terephthalate sheet: incomplete effect of the forming stage.(Technical report)
December 1, 2007... INTRODUCTION Among the still arising manufacturing sectors, the plastic manufacturing industry occupies a strategic place because of the many advantages offered by plastic products. Its expansion is indeed related to the creation of new...

Phase Structure and morphology of wollastonite-reinforced polypropylene composites modified with SEBS and SEBS-g-MA elastomers.(styrene-b-ethylene-co-butylene-b-styrene)(Technical report)
December 1, 2007... INTRODUCTION The intensive growth and use of particulate-filled polymer composites, including those prepared from polyolefins, is due to the demand of materials with improved properties. The purpose of adding mineral fillers to polymers...

Chain extension and degradation during reactive processing of PET in the presence of triphenyl phosphite.(polyethylene terephthalate)(Technical report)
December 1, 2007... INTRODUCTION In recent times, the use of poly(ethylene terephthalate) (PET) increased significantly, especially in applications such as bottles, fibres, films, and engineering products. However, PET undergoes thermal, oxidative, and...

Effects of interfacial morphology on the welding strength of injection-molded polyamide.(Technical report)
December 1, 2007... INTRODUCTION For polymers, Welding technology, which includes adhesive, thermal, and mechanical welding, has been applied extensively and plays an important role in the industrial field [1]. Adhesive welding faces some problems on heat...