Polymer Engineering and Science articles from June 2007

Polymer Engineering and Science archives from June 2007

Noticeable viscosity reduction of polycarbonate melts caused jointly by nano-silica filling and TLCP fibrillation.(thermotropic liquid crystalline polymer)
June 1, 2007... INTRODUCTION Liquid crystalline polymers (LCPs) are attractive high performance engineering materials, because of their high strength and stiffness, high chemical resistance, good dimensional stability, and low linear thermal expansion...

Spatial orientation of nanoclay and crystallite in microcellular injection molded polyamide-6 nanocomposites.
June 1, 2007... INTRODUCTION Reinforcement of polyamides (PA) has been successfully done, using glass fiber and other inorganic additives. Over the last decades, silicate nanoclay platelet also received special recognition as the PA reinforcement. It was...

An experimental study of uniaxial fatigue behavior of an epoxy resin by a new noncontact real-time strain measurement and control system.
June 1, 2007... INTRODUCTION Epoxy polymer materials have been increasingly used in modern industries. They have been applied as alternatives to conventional metal materials in many areas because of their unique properties, such as chemical corrosion...

Compatibility of recycled PVC/ABS blends. Effect of previous degradation.(poly vinyl chloride, acrylonitrile butadiene styrene )
June 1, 2007... INTRODUCTION The recycling of plastic materials is a subject of increasing interest in the last years, because of the great amount of waste generated and the lack of available space at landfill sites. This problem is particularly important...

Enhancement of wood/polyethylene composites via compatibilization and incorporation of organoclay particles.
June 1, 2007... INTRODUCTION The demand for wood-plastic composites (WPCs) is experiencing a substantial growth in recent years [1-5]. The largest market for WPCs is decking. More applications in the areas of railroad tie, infrastructure, automobile, and...

The role of plug design in determining wall thickness distribution in thermoforming.
June 1, 2007... INTRODUCTION Thermoforming is one of the oldest industrial polymer processing techniques. At its simplest it uses a combination of heat and pressure to create final products from preformed polymer shapes. Most commonly the feedstock is in...

Optimization and scale-up of starch cationization in a twin screw extruder.
June 1, 2007... INTRODUCTION In a series of papers [1-4], we have studied, both experimentally and theoretically, the production of cationized wheat starch using a laboratory twin screw extruder. These modified starches are principally used in papermaking...

Quantitative description of polychloroprene and piperylene-styrene blend films surface morphology.
June 1, 2007... INTRODUCTION Polychloroprene adhesive is based on the synthetic chloroprene rubber that possesses similar characteristics to natural rubber and has higher polarity [1]. Polychloroprene rubber is suitable for broad range of substrates for...

Embossing of high-aspect-ratio-microstructures using sacrificial templates and fast surface heating.
June 1, 2007... INTRODUCTION High-aspect-ratio-microstructures (HARMs) can be found in many applications, such as microsensors, microactuators, and high throughput microfluidic systems [1]. LIGA (a German acronym for lithography, electroplating, and...

Experimental study on tensioned-web slot coating.(Author abstract)
June 1, 2007... INTRODUCTION Currently, the flat panel display, particularly the liquid crystal display (LCD), is a fast growing industry. Each LCD panel consists of components such as color filter, polarizer, backlit unit, and drive IC. Many of these...

Injection molding quality control by integrating weight feedback into a cascade closed-loop control system.
June 1, 2007... INTRODUCTION The quality requirements of injection-molded components have become more stringent because of growing plastics applications and increasing customer demands. The quality can be measured in many ways, such as part weight,...

Preparation and characterization of rubber-toughened poly(trimethylene terephthalate)/organoclay nanocomposite.
June 1, 2007... INTRODUCTION Polymer-layered silicate nanocomposites have received much attention in recent years because they exhibit a remarkable improvement in mechanical properties, reduced flammability, and decreased gas permeability [1-7]....

Theoretical and experimental analysis of the die drool phenomenon for metallocene LLDPE.(linear low density polymers)(Author abstract)
June 1, 2007... INTRODUCTION Polymer melts behavior lies between viscous fluid and elastic solid limits. Because of this viscoelastic behavior the material shows phenomena like die drool, swell, etc., which are not fully understood yet and may cause...

HDPE/expanded graphite nanocomposites prepared via masterbatch process.(High Density Polyethylene)
June 1, 2007... INTRODUCTION Conducting polymer composites filled with carbonaceous materials such as carbon black [1, 2], carbon fiber [3], graphite [4-6] and carbon nanotube [7, 8] have been widely studied in the past few decades. It is seen that the...

Influence of the amount of salts of rosin acid on the nonisothermal crystallization, morphology, and properties of Isotactic polypropylene.
June 1, 2007... INTRODUCTION Isotactic polypropylene (iPP) is now widely used in injection molding, blow molding, extrusion, and so on because of its excellent properties such as processability, chemical resistance, electrical, and mechanical properties....

Twin-screw extrusion of polypropylene-clay nanocomposites: influence of masterbatch processing, screw rotation mode, and sequence.(Author abstract)
June 1, 2007... INTRODUCTION Polymer-clay nanocomposites (PCNs) have received intense research interest over the past decade, principally due to the significant macroscopic material property enhancements (e.g., increased tensile strength and modulus and...

Effect of melt annealing on the phase structure and rheological behavior of propylene-ethylene copolymers.
June 1, 2007... INTRODUCTION Since the production of polypropylene (PP) began in 1957, great research effort has been directed towards the improving of the low temperature impact behavior of this material. The most successful procedures found so far are...

Finite element analysis for wavelike flow marks in injection molding.
June 1, 2007... INTRODUCTION Injection molding is one of the most popular processing techniques for polymers and occupies the dominant position in the mass production of plastic products. Recently, resins with enhanced optical and physical properties have...

Mechanical, thermal, and morphological characteristics of compatibilized and dynamically vulcanized polyoxymethylene/ethylene propylene diene terpolymer blends.
June 1, 2007... INTRODUCTION Polyoxymethylene (POM) commonly known as polyacetal is an important engineering resin used in industrial, transportation, agricultural, construction, and consumer markets because of its high strength, stiffness, and excellent...

High strength polyethylene fibers from high density polyethylene/organoclay composites.
June 1, 2007... INTRODUCTION Producing high modulus and high strength fibers from flexible polymers have been one of the challenges in polymer science and technology for a very long time. The polymer in focus is polyethylene due to its availability and...

Structure and properties of in situ compatibilized polystyrene/polyolefin elastomer blends.
June 1, 2007... INTRODUCTION In situ compatibilization technique is considered to be one of the most effective methods to enhance the properties of immiscible polymer blends. The key factor for achieving in situ compatibilization of immiscible polymers is...

Morphology effect on the hydrothermal ageing of a thermoplastic modified epoxy thermoset.
June 1, 2007... INTRODUCTION Epoxy thermosetting polymers are widely used as structural adhesives and matrices for composite materials. Epoxy/thermoplastic binary blends have been extensively studied in the past decade because they offer the possibility...