Showing papers in "Polymer in 2003"

TL;DR: The experimental percolation threshold for the aligned carbon nanotubes used in this paper represents the lowest threshold observed for carbon-nanotube-based polymer composites yet reported.

TL;DR: In this paper, a review of the current efforts to utilize block copolymers in nanotechnologies including nanostructured membranes, BCP templates for nanoparticle synthesis, photonic crystals, and high-density information storage media is presented.

TL;DR: In this article, the effect of incomplete exfoliation of simple stacks of layered aluminosilicates on nanocomposite modulus was examined using the composite theories of Halpin-Tsai and Mori-Tanaka.

TL;DR: In this paper, the authors investigated the crystallization behavior of nylon 6 nanocomposites formed by melt processing by extruding mixtures of organically modified montmorillonite and molten nylon 6 using a twin screw extruder.

TL;DR: In this article, the behavior of melt-blended polypropylene (PP)/single wall carbon nanotube (SWNT) composites has been studied using optical microscopy and differential scanning calorimetry.

TL;DR: In this paper, a twin screw extruder with a particle content of 0.07-1.9 µm and surface treatment of the particles (with and without stearic acid) on the toughening properties were studied.

TL;DR: In this article, the use of octadecylamine modified montmorillonite as substitute of carbon black in natural rubber (NR) compounds is studied, where the modified silicate is analysed by X-ray, FTIR and thermogravimetric analysis.

TL;DR: In this article, the morphology, crystallinity and mechanical properties of electrospun poly(e-caprolactone) nonwoven mats were characterized by scanning electron microscopy (SEM), wide angle X-ray diffraction (WAXD) and universal testing method (UTM), respectively.

TL;DR: In this paper, the preparation, characterization, materials properties, and biodegradability of polylactide (PLA)-layered silicate nanocomposites has yielded results for PLA-montmorillonite nan composites.

TL;DR: In this paper, the intercalation of the polymer chains between the aluminosilicates layers and morphological structure of the filled PLAs were analyzed by wide-angle X-ray scattering (WAXS).

TL;DR: In this paper, complex permittivity and related AC conductivity measurements in the frequency range between 10−4 and 107 Hz are presented for composites of polycarbonate (PC) filled with different amounts of multiwalled carbon nanotubes (MWNT) varying in the range between 0.5 and 5 wt%.

TL;DR: In this paper, a combination of tensile and Raman spectroscopic measurements showed that the presence of MWCNTs in the composites can lead to a ∼150% increase in strain energy density in comparison with the pure UHMWPE film at similar draw ratios.

TL;DR: In this article, the CNT-polymer interfacial shear stress (at 0 K) of about 138 and 186 MPa, respectively, for CNT/polystyrene (PS), was calculated.

TL;DR: In this article, a method to quantify the shear thinning effect for polymer-clay nanocomposites has been developed, based on the exponent n. The method allows to compare the extent of delamination of platelet stacks based on a routine polymer characterization experiment.

TL;DR: In this article, polystyrene (PS) was dissolved in the mixture of tetrahydrofuran (THF) and N,N-dimethyl formamide (DMF) to prepare fibers of sub-micron in diameters.

TL;DR: In this article, the effect of electrospinning parameters on the morphology and fiber diameter of regenerated silk from Bombyx mori was studied, and the effects of electric field and tip-to-collection plate distances of various silk concentrations in formic acid on fiber uniformity, morphology and diameter were measured.

TL;DR: In this article, a series of functional polyhedral oligomer silsesquioxnae (POSS)/polyimide (PI) nanocomposites were prepared using a two-step approach, first, the octa(aminophenyl)silsquioxane (OAPS)/NMP solution was mixed with polyamic acid (PAA) solution prepared by reacting 4,4′-diaminodiphenylmethane and 3,3′,4,4''-benzophenonetetracarboxylic dianhydride

TL;DR: In this article, natural rubber (NR) based nanocomposites with 10% natural and synthetic layered silicates were produced via the latex compounding method, and the silicate dispersion was studied by transmission electron microscopy.

TL;DR: In this article, a conductive polycarbonate (PC) composite containing multiwalled carbon nanotubes (MWNT) was found to be co-continuous over a broad composition range of 30-80vol.

TL;DR: A new process for the dispersion of graphite in the form of nanosheets in a polymer matrix was developed via in situ polymerization of monomer at the presence of sonicated expanded graphite during sonication.

TL;DR: In this paper, different compositions of poly(e-caprolactone) (PCL) and (organo-modified) montmorillonite were prepared by melt blending or catalyzed ring opening polymerization of e-CAPOLACTONE, using dibutyltin dimethoxide as an initiator/catalyst.

TL;DR: In this article, the influence of network density on the strain hardening behavior of amorphous polymers is studied and the network density of polystyrene is derived from the rubber-plateau modulus determined by dynamic mechanical thermal analysis.

TL;DR: A series of polymer-clay nanocomposite (PCN) materials that consist of poly(vinyl alcohol) (PVA) and layered montmorillonite (MMT) clay are prepared by effectively dispersing the inorganic nanolayers of MMT clay in organic PVA matrix via an in situ free radical polymerization with AIBN as initiator as discussed by the authors.

TL;DR: In this article, high-density polyethylene (HDPE) was chemically crosslinked with various amounts of di-tert butyl cumyl peroxide (BCUP), and the results showed a new finding about decrease in Tg as a consequence of the chemical crosslinking of HDPE.

TL;DR: In this paper, a series of polylactide (PLA)/organically modified layered silicate (OMLS) nanocomposites have been prepared using a simple melt extrusion technique.

TL;DR: In this paper, a mixture of polyamide 6/polypropylene and maleated polypropylene (MAH-g-PP) was used to compatibilize the blend system.

TL;DR: In this article, silica nanoparticle-filled poly(ethylene 2,6-naphthalate) composites were melt-blended to improve the mechanical and rheological properties of PEN.

TL;DR: In this paper, two organoclays were synthesized, one was a montmorillonite modified with hexadecylamine (C16-MMT) and the other was a fluorinated-mica modified with Hexadecyamine (H16-Mica) to improve the thermo-mechanical properties.

TL;DR: In this article, a cross polarization/magic angle spinning NMR spectroscopy was used to monitor the structural change of silk fibroins together with the detection of the residual HFA during the process of the fiber formation.

TL;DR: In this paper, the authors demonstrate that all solid polymers are intrinsically brittle and will undergo a ductile to brittle fracture transition based on the nature of their bonding alone, and that the most effective way of avoiding a brittle to brittle transition is to reduce the plastic resistance to delay reaching the brittle strength which is governed by intrinsic cavitation.