Materials Literature
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Abstract The effect of recycled PP on incompatible blends of virgin polypropylene (PP) and high‐density polyethylene (HDPE) was studied. Recycled PP from urban solid waste was extracted with methyl ethyl ketone and the compatibilizing action of the product before and after extraction was examined. The characterization…
Films of bovine collagen were chemically modified with the goal of improving their biomaterial properties. The modified films were investigated with respect to their affinity to fibroblast and endothelial cells, as well as their antibacterial properties tested by adhesion of Staphylococcus aureus. Modifications that o…
ADVERTISEMENT RETURN TO ISSUEPREVNoteCharacterization of the Dispersion of Clay in a Polyetherimide NanocompositeAlexander B. Morgan, Jeffrey W. Gilman, and Catheryn L. JacksonView Author Information Fire Science Division, Building and Fire Research Laboratory, Polymer Division, Materials Science and Engineering Labor…
Abstract N ‐Trimellitylimido‐ DL and L ‐alanine ( 3 ) were prepared from the reaction of trimellitic anhydride ( 1 ) with DL and L ‐alanine ( 2 ) in N,N ‐dimethyl formamide (DMF) solution at refluxing temperature. The direct polycondensation reaction of the monomers imide‐diacid ( 3 ) with 4,4′‐diaminodiphenylsulfone…
The lowest singlet→singlet and singlet→triplet transitions of two point defects observed at the surface of amorphous silica, the dioxasilyrane group, =Si(O2), and the silanone group, =Si=O, have been computed by means of first-principles quantum chemical techniques using cluster models of various sizes. The lowest all…
Abstract Novel polyesteramides were synthesized from p ‐nitrophenyl esters of sebacic or adipic acids and diamines containing α‐amino acid ester groups. The optimal polymerization condition was 60 °C in N,N ‐dimethylformamide. The structures of these polymers were confirmed by IR and NMR. The number‐average molecular…
Abstract The structures of the intumescent charred layers formed from polyolefin (PO) blends with expandable graphite (EG) and/or the other free‐halogen flame retardant (HFFR) and their flame‐retardant mechanism were studied by Fourier transform infrared (FTIR) spectroscopy, X‐ray photoelectron spectroscopy (XPS), las…
The modification of the adhesion and spreading of BHK21 fibroblast cells has been studied for new biocompatible surfaces obtained by irradiating polyhydroxymethylsiloxane thin films with increasing doses of 5 keV Ar + ion beams. The irradiated surfaces showed a dose-dependent increase of cytocompatibility, with an obs…
Abstract Polyurethane‐nitrolignin (PUNL), a new network polymer, was synthesized from a castor oil based–polyurethane (PU) prepolymer and nitrolignin (NL) with a weight‐average molecular weight of 20.6 × 10 4 and a content of 1.4–10%. The structure and miscibility of PUNL films prepared by solution casting were invest…
The performance of the density functional approach in the relativistic zero order regular approximation for the evaluation of electron spin resonance (ESR) parameters in small metal compounds has been evaluated critically by comparison with experimental data and available theoretical results for 22 linear molecules, c…
The extent of H bonding in alcohols may be reduced by sterically hindering its OH group. This technique is used here for investigating the reasons for the prominent Debye-type dielectric relaxation observed in monohydroxy alcohols [Kudlik et al., Europhys. Lett. 40, 549 (1997); Hansen et al., J. Chem. Phys. 107, 1086…
Abstract In this paper, the ultrasonic induced encapsulating emulsion polymerization technique was used to prepare polymer/inorganic nanoparticle composites. The main affecting factors in ultrasonic induced encapsulating emulsion polymerization were studied systematically. The experimental results suggested that the p…
Time-sequenced atomic force microscopy (AFM) studies of ultrathin films of cylinder-forming polystyrene-block-polymethylmethacrylate (PS-b-PMMA) copolymer are presented which delineate thin film mobility kinetics and the morphological changes which occur in microphase-separated films as a function of annealing tempera…
Combining molecular beam techniques and time-resolved infrared reflection absorption spectroscopy (TR-IRAS) we have studied the kinetics of the CO oxidation reaction on an alumina-supported Pd model catalyst. The Pd particles are deposited by metal evaporation under ultrahigh vacuum (UHV) conditions onto a well-ordere…
Abstract The use of some types of expandable graphite (EG) as an intumescent flame‐retardant additive in polyolefins was studied using the cone calorimeter test (CCT), thermogravimetric analysis (TGA), the limiting oxygen index (LOI), and the‐UL 94 test and through measurement of EG's mechanical and electrical propert…
Abstract In the present work, experimental studies of the free‐radical‐initiated molecular weight degradation of polypropylene in a modular self‐wiping corotating twin‐screw extruder are investigated. The control of the molecular weight distribution of polypropylene resins by peroxide degradation is widely used in the…
The assembly of alternating DNA and positively charged poly(dimethyldiallylammonium chloride) (PDDA) multilayer films by electrostatic layer-by-layer adsorption has been studied. The real-time surface plasmon resonance (BIAcore) technique was used to characterize and monitor the formation of multilayer films in soluti…
The achiral syn folded (face-to-face conformation) host molecule of the ethane-bridged bis(zinc porphyrin) transforms into the corresponding chiral extended anti bis-ligated species in the presence of enantiopure amine guests. The mechanism of the supramolecular chirogenesis is based upon the screw formation in bis(zi…
If the critical current density Jc is very high for a superconductor, then estimating its value from transport measurements is not very easy. In such cases, the value of Jc, called Jcm for magnetic Jc, is usually obtained from the measured magnetic hysteresis loop measurements by using a proper critical state model su…
Spin-polarized band calculations for supercells of SrB$_{6}$, where a La-, In- or Al- impurity or a vacancy is replacing one Sr, are performed within the local spin density approximation. Moderately large cells with 8 formula units (56 atoms) are studied for all dopings and large ones with 27 formula units (189 atoms)…