Polymer Engineering and Science articles from October 2008

Polymer Engineering and Science archives from October 2008

Polychar 15 special issue.(Preface)
October 1, 2008... Buzios, April 2007 The 15th Annual World Forum on Advanced Materials (POLYCHAR 15) was held in Buzios, Brazil, April 16-20, 2007. The conference was organized by the Institute of Macromolecules, Federal University of Rio de Janeiro...

Polyaniline/multiwalled carbon nanotube systems: dispersion of CNT and CNT/PANI interaction.(carbon nanotubes, polyaniline )
October 1, 2008... INTRODUCTION Intrinsically conducting polymers have attracted a great attention in recent years owing to the possibility of their commercial application in electronic devices (1). Polyaniline (PANI) doped with protonic acids is an...

Preparation and characterization of crosslinked resins containing ferrite particles.(Technical report)
October 1, 2008... INTRODUCTION Magnetic composite materials have potential technological application in the development of new materials for pollutant removal, water treatment, cell labeling, cell separation, enzyme immunoassaying, drug targeting, and...

Adsorption of polymers used in drilling fluids on the inner surfaces of carbon steel pipes.(Technical report)
October 1, 2008... INTRODUCTION Drilling wells to find economically recoverable hydrocarbon reserves starts with the opening of vertical holes in exploratory, or pioneer, fields. When a deposit of oil and/or gas is discovered, it is then delimited by...

Settling rates for flocculation of iron and manganese ore-containing suspensions by cationic glycogen.(Technical report)
October 1, 2008... INTRODUCTION There is a difficulty in the basic process of getting solid constituents out of a liquid solution or suspension. Fine particles with diameters on the order of 10 [micro]m will not settle out of suspension by gravity alone in...

Thermogravimetric and spectrometric characterizations of poly(styrene-co-divinylbenzene) containing phosphinic and phosphonic acid groups.(Technical report)
October 1, 2008... INTRODUCTION Functionalized crosslinked resins have gained great importance in many fields of scientific research as well as for industrial applications, which go on increasing due to several possibilities of modifications on their...

Thermal and low-field NMR study on poly(vinylidene fluoride) and their physical mixtures with poly(methyl methacrylate).(nuclear magnetic resonance)(Technical report)
October 1, 2008... INTRODUCTION Blends of poly(vinylidene fluoride) (PVDF) and poly (methyl methacrylate) (PMMA) have been studied in the last years because of their chemical resistance, optical properties, and other special properties that indicate their...

Grafting of maleic anhydride on polypropylene and its effect on blending with poly(ethylene terephthalate).(Technical report)
October 1, 2008... INTRODUCTION Polymer blending is a practical technique to obtain materials that combine the properties of the initial constituent polymers. It is a widely used commercial practice, since the initial properties can be adjusted to fulfill...

Polyester containing isocyanate groups--modified epoxy resin: rheological, dynamic-mechanical, and impact properties.(Technical report)
October 1, 2008... INTRODUCTION Highly crosslinked thermosets are well known to exhibit structural stiffness and dimensional stability. Among thermosets, epoxy resins (ERs) combine good processability, low shrinkage during cure and other important...

Surface studies of corona treated polydimethylsiloxane-block-polystyrene hybrid copolymer films.(Technical report)
October 1, 2008... INTRODUCTION The synthesis of organic/inorganic hybrid materials is an area of growing interest as the useful properties of disparate components can be combined into a single material. The fact that the inorganic polymers have totally...

Interphase phenomena in nanoparticulate filled Polyurethane/poly(vinyl acetate) polymer systems.(Technical report)
October 1, 2008... INTRODUCTION Blending of two polymers is an interesting field for investigating both scientific and industrial because it provides an effective route for obtaining materials with improved property/cost performances without the need to...

Biodegradable nanosize particles of poly(L,L-lactide)-b-poly(ethylene glycol)-b-poly(L,L-lactide).(Technical report)
October 1, 2008... INTRODUCTION The dissimilar characters of the segments in block copolymers turn the self-organization thermodynamically favorable, and therefore long-range periodicities in the nanoscale are observed in those polymers. The use of...

New polyaniline/polycardanol conductive blends characterized by FTIR, NIR, and XPS.(Fourier transform spectroscopy, near infrared, extruded polystyrene)(Technical report)
October 1, 2008... INTRODUCTION Polyaniline (Pani) has attracted much attention in the last decades, when compared with other conducting polymers, because of its easy chemical synthesis, high stability towards environmental exposition, and special electronic...

Environmental stress cracking behavior of bottle and fiber grade poly(ethylene terephthalate) in contact with aqueous amine solutions.(Technical report)
October 1, 2008... INTRODUCTION Poly(ethylene terephthalate) (PET) is a semi-crystalline linear condensation polymer and it is better represented by the model of the fringed micelle, where the crystalline and amorphous domains are interconnected. Like many...

Poly(4-hydroxyphenylacetic acid): a new material for immobilization of biomolecules.(Technical report)
October 1, 2008... INTRODUCTION Some functionalized coating materials, based on organic polymers, are a research theme that has received considerable attention. The functionalization of the polymers widens the possibilities of surface modifications of...

Effects of surface plasma treatment on tribology of thermoplastic polymers.(Technical report)
October 1, 2008... INTRODUCTION The use of polymer-based materials (PBMs) has become widespread owing to their high performance and relatively low cost (1). For applications where friction, wear, and adhesion properties are important, it is essential to...

Microhybrids of metal powder incorporated in polymeric matrices: friction, mechanical behavior, and microstructure.(Technical report)
October 1, 2008... INTRODUCTION Polymers exhibit many advantages over other structural materials, such as low cost, ease of processing, low density, and resistance to shocks and vibrations. In tribology an additional advantage is the possibility to tailor a...

Predicting wear from mechanical properties of thermoplastic polymers.(Technical report)
October 1, 2008... INTRODUCTION Polymer based materials (PBMs) continue to replace metals because they are lightweight, easy to process, and relatively inexpensive (1). However, wear of polymers and PBMs contributes to significant financial loss in industry...

Effect of the filler characteristics on the miscibility of styrene-butadiene rubber and nitrile-butadiene rubber blends.(Technical report)
October 1, 2008... INTRODUCTION Polymeric blends are a new kind of materials prepared by mixing two or more components with different characteristics in order to increase the resistance to chemicals and the mechanical and thermal properties by synergetic...

Adhesion parameters at the interface in nanoparticulate filled polymer systems.(Technical report)
October 1, 2008... INTRODUCTION The interfacial region or the interface between the matrix and the nanofillers determines nanocomposite properties with the emphasis on the three-dimensional nature of the region (1). Such interfaces are formed when polymers...

Stress cracking and photodegradation behavior of polycarbonate. The combination of two major causes of polymer failure.(Technical report)
October 1, 2008... INTRODUCTION Despite the widespread use of polymer products in engineering applications, they are still an easy target of criticism owing to the premature failure under service, which are caused by a number of factors that may be related...

Amphiphilic derivatives of carboxymethylcellulose: Evidence for intra- and intermolecular hydrophobic associations in aqueous solutions.(Technical report)
October 1, 2008... INTRODUCTION Hydrophobically modified water-soluble polymers (both synthetic and natural) or amphiphilic polymers have received great attention because of their potential use in various industrial applications such as cosmetics, paints,...

Polymer nanocomposite materials based on polystyrene and a layered aluminate filler.(Technical report)
October 1, 2008... INTRODUCTION In recent years, polymer/layered double hydroxide (LDH) nanocomposites have attracted great interest in the field of material chemistry due to their novel mechanical, thermal, and optical properties (1-9), which are mainly...

Melt processing and filler/matrix interphase in carbon nanotube reinforced poly(ether-ester) thermoplastic elastomer.(Technical report)
October 1, 2008... INTRODUCTION Multi-walled carbon nanotubes can be considered one-dimensional. They consist of an array of cylinders formed concentrically and separated by 0.34 nm, a distance similar to the graphite interlayer spacing. Given their high...

Rheological and thermal properties of ethylene-styrene copolymers.(Technical report)
October 1, 2008... INTRODUCTION In the last years, the use of single site catalysts has resulted in a fast development of new polyolefin materials with a vast range of structures and properties (1)[. In most of the cases, the technology of Ziegler-Natta...

Electrodes modified with polyaminophenols: immobilization of purines and pyrimidines.(Technical report)
October 1, 2008... INTRODUCTION In recent years, polymers have received considerable attention because of new and interesting applications in the fields of batteries (1), electrochromic devices (2), electrocatalysis (3), and biosensors (4)....

Synthesis of biodegradable polyhydroxyalcanoate copolymer from a renewable source by alternate feeding.(Technical report)
October 1, 2008... INTRODUCTION The polyhydroxyalkanoates have been the focus of extensive research considering their potential application as biodegradable and biocompatible thermoplastics (1). The polyhydroxyalcanoates copolymers with 3-hydroxybutirate...

Characterization of grooves in scratch resistance testing.(Technical report)
October 1, 2008... INTRODUCTION Determination of scratch resistance is one of the most important aspects of tribology of materials, together with friction and wear. As discussed in the literature (1-3), polymer tribology is much more difficult than that of...

Effect of surfactant type on the synthesis of PMMA using redox initiation and high frequency ultrasound.(polymethylmethacrylate)(Technical report)
October 1, 2008... INTRODUCTION Redox initiators have been usually employed to carry out polymerization of viny1 monomers such as methylmethacrylate (MMA) (1), (2). One important advantage of this type of initiation is the rapidity of generation of free...