Showing papers in "Polymer in 2004"

TL;DR: In this article, a poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) film is enhanced by more than 100 fold on adding some organic compounds into aqueous solutions or by treating it with organic solvents, such as ethylene glycol, 2-nitroethanol, methyl sulfoxide or 1-methyl-2-pyrrolidinone.

TL;DR: In this paper, the influence of different process parameters on the electric current and volume and surface charge density in the polymer jet was measured and the electric conductivity and permittivity were measured as well.

TL;DR: In this article, the electrical conductivity of polyamide-6 and carbon nanotubes (NT) composites was analyzed and compared to carbon black filled polyamide 6 composites.

TL;DR: In this article, a multiscale modeling strategy is employed to account for the hierarchical morphology of the nanocomposite: at a lengthscale of thousands of microns, the structure is one of high aspect ratio particles within a matrix; at the lengthscale, the clay particle structure is either (a) exfoliated clay sheets of nanometer level thickness or (b) stacks of parallel clay sheets separated from one another by interlayer galleries of nanometers level height, and the matrix, if semi-crystalline, consists of fine lamella, oriented with respect to

TL;DR: In this article, the mass concentration-mechanical property relationship of the resulting nanofiber membranes was investigated, and it was found that the highest mechanical behavior did not occur to the nanofibrous membrane electrospun from the lowest or the highest mass concentration solution, instead, the matrix with the finest fiber structure and no beads on surface obtained from the 7.5% mass concentration exhibited the largest tensile modulus and ultimate tensile strength.

TL;DR: In this paper, a series of composites of polycarbonate (PC) with 23 different contents of multiwalled carbon nanotubes (MWNT) was produced by melt mixing using the masterbatch dilution method.

TL;DR: In this article, the effects of solution properties and polyelectrolyte on the electrospinning of poly(ethylene oxide) (PEO) solutions were investigated, and the average diameters of PEO fibers were ranged from 0.36 to 1.96 μm.

TL;DR: In this article, the authors developed novel polyvinyl alcohol (PVA)/poly(ethylene glycol) (PEG) hydrogel blends and PVA-derived organic-inorganic hybrid materials and performed nanostructural characterizations.

TL;DR: In this paper, the thermal and flammability properties of polypropylene/multi-walled carbon nanotube, (PP/MWNT) nanocomposites were measured with the MWNT content varied from 0.5 to 4% by mass.

TL;DR: In this article, anhydride-cured diglycidyl ether of bisphenol A (DGEBA) reinforced with 2.5-5% by weight graphite platelets was fabricated.

TL;DR: In this paper, the fiber spinning technique of electrospinning was optimized in order to prepare unidirectional aligned, structurally oriented, and mechanically useful carbon precursor fibers with diameters in the nanoscale range.

TL;DR: In this article, a two-layer system, with the lower layer being a ferromagnetic suspension and the upper layer a polymer solution, is subject to a normal magnetic field provided by a permanent magnet or a coil.

TL;DR: In this paper, an electrospinning method was used to fabricate chitin nanofibous matrix for wound dressings, which was depolymerized by gamma irradiation to improve its solubility.

TL;DR: In this article, the thermal and flammability properties of polyamide 6/clay (2 and 5% by mass fraction) nanocomposites were measured to determine their flame retardant (FR) performance.

TL;DR: In this article, the effect of the number of alkyl groups attached to the nitrogen of the organic modifier on exfoliation and improvement of mechanical properties of polyethylene-clay nanocomposites was investigated.

TL;DR: In this article, the role of organically modified layered silicate as a compatibilizer for immiscible polystyrene (PS) with polypropylene (PP) or polyethylene grafted with maleic anhydride (PP-g-MA) blends was investigated.

TL;DR: In this article, the effect of pH on the formation of poly(acrylic acid) copolymers was investigated, and it was found that the amount of water present during the polymerization increases primary cyclization rates, and this change affects the subsequent swelling behavior of the acrylic acid hydrogel.

TL;DR: In this article, a rigid cellulosic network within a poly(oxyethylene) matrix and a stable aqueous suspension of cellulose nanocrystals extracted from tunicate as the reinforcing phase were obtained by casting and evaporating the preparations, using scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis and dynamic mechanical analysis.

TL;DR: In this article, the effects of various melt-electrospinning parameters on the morphology and fiber diameter of polypropylene of different tacticities were studied, and it was shown that the molecular weight was the predominant factor in determining the fiber diameter.

TL;DR: In this article, a series of blend biodegradable nanofibrous mats comprising polyvinyl alcohol (PVA) and cellulose acetate (CA) were prepared via multi-jet electrospinning.

TL;DR: In this paper, a polyvinyl chloride (PVC)/calcium carbonate (CaCO 3 ) nanocomposites were synthesized by in situ polymerization of vinyl chloride (VC) in the presence of CaCO 3 nanoparticles, and their thermal, rheological and mechanical properties were evaluated by dynamic mechanical analysis (DMA), thermogravimetry analysis (TGA), capillary rheometry, tensile and impact fracture tests.

TL;DR: In this article, a range of multi-wall carbon nanotubes and carbon nanofibres were mixed with a polyamide-12 matrix using a twin-screw microextruder, and the resulting blends spun to produce a series of reinforced polymer fibres.

TL;DR: In this article, the influence of CaCO 3 nanoparticles on the crystallization of polypropylene (PP) was studied by wide angle X-ray diffraction and polarized optical microscopy.

TL;DR: In this article, DuPont 7A and 7C Teflon (PTFE, poly(tetrafluoroethylene)) were tested in tension at strain-rates between 2×10 −4 and 0.1 s −1 and temperatures between −50 and 150 ǫ c.

TL;DR: In this paper, the effects of film thickness on the rate of physical aging were examined, and the results obtained in this study were compared with prior work on thickness-dependent aging, which showed that a substantial aging response was observed at temperatures more than 150°C below T g for thin films of each polymer compared to what is observed for the bulk polymers.

TL;DR: In this article, an organic-inorganic hybrid involving epoxy resin and polyhedral oligomeric silsesquioxanes (POSS) was prepared via in situ polymerization of diglycidyl ether of bisphenol A (DGEBA) and 4,4′-diaminodiphenylmethane (DDM) in the presence of two structurally similar POSS monomers.

TL;DR: In this article, the electrospinning of silk fibroin(SF)/chitosan(CS) blends with different composition ratios was performed with formic acid as a spinning solvent.

TL;DR: In this paper, suspensions of cellulose microfibrils resulting from the homogenization of parenchymal cell walls were surface silylated with isopropyl dimethylchlorosilane.

TL;DR: In this article, the influence of the copolymer structure on the matrix/dispersed phase interfacial adhesion was correlated with the mechanical properties of the PLLA composites.

TL;DR: In this paper, the ionic liquid-type polymer brush exhibited the highest ionic conductivity of 1.37×10 −4 ǫS cm −1 at 30 °C, reflecting low T g of −60 °C.