Showing papers in "Polymer in 2002"

TL;DR: In this paper, an electrospinning method was used to fabricate bioabsorbable amorphous poly( d, l -lactic acid) (PDLA) and semi-crystalline poly( l-lactic acids) (PLLA) nanofiber non-woven membranes for biomedical applications.

TL;DR: In this paper, the rheological behavior of compression molded mixtures of polycarbonate containing between 0.5 and 15% carbon nanotubes was investigated using oscillatory rheometry at 260°C.

TL;DR: In this article, a segmented polyurethaneurea based on poly(tetramethylene oxide)glycol, a cycloaliphatic diisocyanate and an unsymmetrical diamine were prepared.

TL;DR: In this article, a series of organic amine salts were ion exchanged with sodium montmorillonite to form organoclays varying in amine structure or exchange level relative to the clay.

TL;DR: In this paper, the extent of clay platelet exfoliation in a maleated polyethylene (PE- g -MAn) matrix was confirmed by X-ray diffraction and resulted in a significant reduction of the degree of crystallinity and increased polymer crystallization rates.

TL;DR: In this article, a First Law procedure is suggested which involves heating the sample between two set temperatures, T1 and T2, by the requirement that the degree of crystallinity of the sample should not change either with temperature or time.

TL;DR: In this paper, the products of the thermal degradation of polydimethylsiloxane (PDMS) are determined by the heating conditions, since two competing mechanisms are involved: molecular splitting of oligomers from loop conformations of the PDMS chain and assistance on the part of empty silicon d-orbitals.

TL;DR: In this article, the authors investigated the possibility of improving the mechanical properties of high-functionality epoxy resins through dispersion of octadecyl ammonium ion-modified layered silicates within the polymer matrix.

TL;DR: In this paper, nanocomposites of poly(e-caprolactone) (PCL) were prepared by melt blending the polymer with natural Na + montmorillonite and montminillonite modified by hydrogenated tallowalkyl (HTA)-based quaternary ammonium cations, such as dimethyl 2-ethylhexyl HTA ammonium and methyl bis bis(2-hydroxyethyl) ammonium.

TL;DR: In this paper, a series of alkyldimethylchlorosilanes, with alkyl moieties ranging from isopropyl to n-butyl, n-octyl and n-dodecyl, were used for the silylation of tunicin.

TL;DR: In this paper, the authors demonstrate the potential of using polymer nanocomposites as the foundation for fabricating nano-and mesoscopic structures, and thus exerting hierarchical control of morphology and form through the combination of a nanostructured material and a nanoscale fabrication technique.

TL;DR: In this article, the nano carbon fibers exhibited good dispersion in the polypropylene matrix as observed by scanning electron microscopy, and at 5 wt% nano carbon fiber loading, modulus and compressive strength increased by 50 and 100%, respectively.

TL;DR: The mechanisms of deformation and fracture of isotactic polypropylene filled with CaCO3 particles were studied in this paper, where three types of particles with average diameters of 007, 07, and 35μm were used at filler volume fraction from 005 to 030.

TL;DR: In this paper, a crosslinked polyester-clay nanocomposites were prepared by dispersing organically modified montmorillonite in prepromoted polyester resin and subsequently crosslinked using methyl ethyl ketone peroxide catalyst at several different clay concentrations.

TL;DR: In this article, a methodology has been developed for construction of atomistic models of crosslinked polymer networks, applied to low molecular weight water soluble epoxy resins crosslinked with different curing agents that are being considered for use as a primer coating on steel.

TL;DR: In this article, the authors reported a newly developed fabrication method that can scale-up or down the IPMC artificial muscles in a strip size of micro-to-centimeter thickness.

TL;DR: The tensile strength of the EPDM-clay hybrid loading 4-wt% clay exhibited 2.0 times higher value compared to that of neat EPDm at 25-°C.

TL;DR: In this paper, the dispersion of the silicate layers in the APES hybrids was characterized by using X-ray diffraction (XRD) and transmission electron microscopy (TEM).

TL;DR: In this paper, a polyurethane/Na+-montmorillonite nanocomposites were synthesized using modified 4,4′-di-phenymethylate diisocyanate (M-MDI), modified polyether polyol (MPP), and Na+-moronite (layered clay).

TL;DR: In this paper, a model was developed to predict the buckling of platelets in reinforced materials under compressive loading, and a critical strain above which platelet buckling, and hence a reduction in the compressive modulus relative to the tensile modulus, would be expected to occur.

TL;DR: In this paper, the gallery size of solution-intercalated PEO/MMT and B34 hybrid was compared by X-ray diffraction and Fourier transform infrared (FTIR) analysis.

TL;DR: In this article, the linear thermal expansion behavior of nanocomposites was measured and compared with the theory by Chow, and the results showed that high molecular weight (HMW) nylon 6 nanocompositionites resulted in lower thermal expansion than LMW nylon 6 at the same organoclay content.

TL;DR: In this paper, a series of random copolymers of PMMA-r-TAN from a mixed solvent of toluene and dimethyl formamide was used to produce sub-micron fibers with a specific surface chemistry through electrospinning.

TL;DR: In this article, polyethylene-layered silicate nanocomposites were prepared by the in situ intercalative polymerization of ethylene by the so-called polymerization-filling technique and analyzed by transmission electron microscopy, X-ray diffraction analysis (XRD), differential scanning calorimetry, dynamic mechanical analysis and tensile testing.

TL;DR: In this paper, magnetic and conducting Fe 3 O 4 -cross-linked polyaniline (CLPANI) nanoparticles with core-shell structure have been prepared in the presence of magnetic fluid in aqueous containing polyethylene glycol as a surfactant.

TL;DR: In this paper, the phase behavior of linear poly(N-isopropylacrylamide) (PNIPA) in water-solvent mixtures was investigated.

TL;DR: In this article, the fracture and failure modes of α-and β-phase polypropylene homopolymers (PP-H, block- and random-type copolymers with ethylene) with high speed flexural tests and compared.

TL;DR: In this article, the effect of the concentration of ethylene glycol in the PVDF spinning solution as well as ethanol either in the internal or the external coagulant on the morphology of the hollow fibers was investigated.

TL;DR: In this paper, a four-point resistivity probe system was used to measure the electrical conductivity of polymethylmethacrylate (PMMA)/expanded graphite (EG) and PMMA/untreated graphite composites were prepared by direct solution blending of PMMA with EG and UG fillers.

TL;DR: In this article, the effect of shear on the crystallization kinetics and morphology of polypropylene has been studied and a model valid for PP crystallization under quiescent conditions was extended to include shear-induced crystallization by linking the extra number of activated nuclei observed after shear treatment to the first normal stress difference.