Polymer Engineering and Science articles from July 2008

Polymer Engineering and Science archives from July 2008

Material characterization of components and assembled behavior of a composite liner for rehabilitation of cast iron pressure pipes.
July 1, 2008... INTRODUCTION Cast iron pipes have been used since the late 1800s to build water distribution systems. Up until the early 1970s, the majority of these systems were constructed using gray cast iron pipes (1). Since then, ductile iron has...

Linear and nonlinear melt-state viscoelastic properties of polypropylene/organoclay nanocomposites.(Technical report)
July 1, 2008... INTRODUCTION During the last two decades, increasing activities have been devoted towards the polymer layered silicate nanocomposites (PLSNs) because of the attractive technological applications and scientific issues concerning these...

A new linear viscoelastic model for emulsions and suspensions.(Technical report)
July 1, 2008... INTRODUCTION The rheological behavior of emulsions and suspensions is of interest in many industrial applications. For example, filled polymeric materials, consisting of solid particles, dispersed in a polymeric matrix are often used in...

Diffusion-controlled atom transfer radical polymerization with crosslinking.(Technical report)
July 1, 2008... INTRODUCTION Atom transfer radical polymerization (ATRP) is one of the most efficient synthetic methods that can be used to prepare well-defined polymers with controlled chain topology, composition, microstructure, and functionality (1-5)....

Nanocomposites from plasticized high-amylopectin, normal and high-amylose maize starches.(Technical report)
July 1, 2008... INTRODUCTION Biodegradable polymers have become important materials tailored to new environmentally friendly products, especially in the packaging industry (1-3). Starch plays an important role in these polymers mainly because of its...

Nonisothermal crystallization of high density polyethylene and nanoscale calcium carbonate composites.(Technical report)
July 1, 2008... INTRODUCTION Polymer nanocomposites containing inorganic fillers have attracted great attention because of their significant improvements in mechanical strength and thermal properties at low filler loadings (1-3). They have combined the...

Macroindentation of polymers.(Technical report)
July 1, 2008... INTRODUCTION High performance polymers are spreading rapidly in many industrial applications, being attractive materials for the fabrication of structural and functional parts. Many engineering plastics (such as PA, PEEK, or PPS) are...

Hard coatings on polycarbonate plate by sol-gel reactions of melamine derivative, PHEMA, and silicates.(poly(2-hydroxyethyl methacrylate))(Technical report)
July 1, 2008... INTRODUCTION During the past thirty years, there has been considerable research into substitutes for glass in cars, such as polycarbonate, because glass is heavy and quite fragile. The density of glass is more than double that of...

Cocontinuous Cellulose acetate/polyurethane composite nanofiber fabricated through electrospinning.(Technical report)
July 1, 2008... INTRODUCTION Electrospinning is a simple and versatile technique in the generation of continuous ultrafine fibers with diameter down to submicrometers or even 10s of nanometers (1). Nanofiber possesses the characteristic features of high...

Design of experiments applied to the study of the reaction between phenylphosphonic dichloride with bisphenol by inverse phase transfer catalysis method.(Technical report)
July 1, 2008... INTRODUCTION Phosphorus-containing polymer materials such as polyphosphonates and polyphosphates were noticed by their special properties, i.e., fire resistance, plasticity, lubricant, high physical--mechanical performance, thermal...

Cell coalescence suppressed by crosslinking structure in polypropylene microcellular foaming.(Technical report)
July 1, 2008... INTRODUCTION There has been considerable interest in the relationships between foaming behavior and viscoelastic properties of polymers in recent years. Numerous researches have verified that the cell wall of low-melt-strength polymer...

A novel biobased resin-epoxidized soybean oil modified cyanate ester.(Technical report)
July 1, 2008... INTRODUCTION Vegetable oil represents one of the cheapest and most abundant biological feedstocks available in large quantities, and its use as starting material offers numerous advantages, such as low toxicity and inherent...

Synthesis and properties of polybenzoxazine modified polyurethanes as a new type of electrical insulators with improved thermal stability.(Report)
July 1, 2008... INTRODUCTION Polyurethanes constitute one of the most versatile classes of polymeric materials with a vast spectrum of physical, chemical, and mechanical properties [1, 2]. Despite the possibility of tailoring their properties according to...

A new method for producing high melt strength polypropylene with reactive extrusion.(Technical report)
July 1, 2008... INTRODUCTION Isotactic polypropylene has many desirable and beneficial physical properties such as high mechanical strength, inertness to various chemical reagents, nontoxicity, high transparency, high glossiness, and so forth. However, as...

Temperature dependence of electrical resistivity in carbon nanofiber/unsaturated polyester nanocomposites.(Technical report)
July 1, 2008... INTRODUCTION Carbon nanotubes (CNTs) have attracted great interest in the development of applications due to their exceptional mechanical, electrical, and thermal properties [1-4]. There are many ways to produce CNTs and carbon nanofibers...

A novel fabrication route for Auxetic polyethylene, part 2: mechanical properties.(Technical report)
July 1, 2008... INTRODUCTION Auxetic microporous polymers (i.e., those with a negative Poisson's ratio, [upsilon]) have been studied since 1989, when a form of polytetrafluoroethylene was discovered to have this property due to its complex microstructure...

Reactive compatibilization of biodegradable poly(lactic acid)/poly([epsilon]-caprolactone) blends with reactive processing agents.(Technical report)
July 1, 2008... INTRODUCTION Owing to current environmental issues such as fossil resource depletion and global warming caused by carbon dioxide emission, carbon-neutral materials that have the potential to reduce the consumption of petroleum and reduce...

Preparation and characterization of melt-processed polycarbonate/multiwalled carbon nanotube composites.(Technical report)
July 1, 2008... INTRODUCTION Multiwalled carbon nanotubes (MWCNTs), first reported by Iijima in 1991 (1), contain exclusive structural, mechanical, and electrical properties (2). Because of the exceptional properties of MWCNTs, many investigations have...

Role of core-shell rubber particle cavitation resistance on toughenability of epoxy resins.(Technical report)
July 1, 2008... INTRODUCTION Rubber toughening of epoxies was first studied by Sultan and McGarry [1-3]. They successfully increased the fracture toughness of epoxy resins by application of carboxyl-terminated acrylonitrile butadiene liquid rubber. Since...

Effect of filler size distribution on the mechanical and physical properties of alumina-filled silicone rubber.(Technical report)
July 1, 2008... INTRODUCTION Recent advancement in electronics technology has resulted in the miniaturization of transistors, allowing more transistors to be integrated into a single device (1-3). Nevertheless, integration and cramming of transistors...

Influence of polydispersity of crystallizable segments on the properties of segmented block copolymers.(Technical report)
July 1, 2008... INTRODUCTION Segmented copolymers consist of alternating flexible and rigid segments. The structure of the rigid segments exerts a strong effect on the phase separation and consequently on the physical properties of the copolymer (1), (2)....

Effect of swelling agent on the molecular weight of poly(2,6-dimethyl-1,4-phenylene oxide) synthesized in an aqueous medium.(Technical report)
July 1, 2008... INTRODUCTION The oxidative polymerization of 2,6-dimethylphenol (DMP) in organic solvents developed by Hay et al. (1) provides a convenient method to prepare poly (2,6-dimethyl-l,4-phenylene oxide) (Scheme 1 (1); PPO). Besides PPO, a small...

Prediction of fiber orientation in a rotating compressing and expanding mold.(Technical report)
July 1, 2008... INTRODUCTION Injection-molded fiber-reinforced polymers, FRP, show a complex morphology featuring spatial variations of the molecular and fiber orientation distributions, as a consequence of the thermomechanical history imposed during...

Biaxial yielding of polypropylene elastomeric polyolefin blends: effect of elastomer content and thermal annealing.(Technical report)
July 1, 2008... INTRODUCTION Polypropylene (PP) is a thermoplastic polymer with a large number of desirable properties that make it a versatile material, even if its applications are limited by the poor impact strength, especially at low temperatures....

Influence of compatibilizer precursor structure on the phase distribution of low density poly(ethylene) in a poly(ethylene terephthalate) matrix.(Technical report)
July 1, 2008... INTRODUCTION The increased interest of many research groups in the properties of PET/polyolefins blends is due to the necessity of preparing toughened materials from virgin PET [1-6] or developing new opportunities for postconsumer PET...

Time, temperature, and strain effects on viscoelastic poisson's ratio of epoxy resins.(Technical report)
July 1, 2008... INTRODUCTION In a deformed solid, Poisson's ratio is defined as the negative ratio between the lateral deformation and the axial imposed deformation. It is defined for infinitesimal extensions, and for an ideal elastic solid it is...

Erratum.(Correction notice)
July 1, 2008... Erratum to "Viscoelastic Evaluation of Effects of Fiber Size and Composition on Cellulose-Polypropylene Composite of High Filler Content" by Hirokazu Ito et al., published in POLYM. ENG. SCI., 48:168-176, 2008. DOI: 10.1002/ pen.20946 A...