Materials Literature
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We report a chemical processing technology that allows the continuous spinning of single-walled carbon nanotubes (SWNTs)-nylon 6 (PA6) fibers by the in-situ polymerization of caprolactam in the presence of SWNTs, which simultaneously optimizes the morphology of the composite. We show that caprolactam is an excellent s…
Flexible polyurethane foam is often molded directly into preheated tools for foaming reaction which expands to fill the mold cavity. The foam that is directly in contact with the mold surface cures as the foam skin. Parts frequently have surface defects ranging from shrink marks, to voids, to mottling, and knit lines.…
We describe a new damage testing approach and instrumentation that provides quantitative measurements of bulk damage versus fluence for several frequencies. A major advantage of this method is that it can simultaneously provide direct information on pinpoint density and size, and beam obscuration. This allows for more…
Abstract As a result of a systematic analysis of the compilation of McMaster's x‐ray cross‐sections, the polynomial coefficients of the N range (from edges N 7 to M 5 ) of elements Z = 61–69 have to be corrected. Furthermore, no detailed information on position and jumps of M edges of elements Z > 53 and N edges of…
Aggregation abgeblockt: Triblock-Copolymere bestehend aus einem zentralen Polypeptidblock aus repetitiven [(AlaGly)3GluGly]n-Sequenzen mit β-Faltblattstruktur und Polyethylenglycol (PEG) von Mn=750 g mol−1 wurden synthetisiert und auf ihre Aggregationseigenschaften untersucht. Das Anbringen der PEG-Komponente verhinde…
Nucleation by chiral polyimide surfaces leads to finite enantioselectivity in the B4 phase of achiral banana mesogen molecules (see optical micrograph). An ee value of 10 % was obtained with rubbed chiral polyimide surfaces. This technique opens up new possible ways of controlling chirality in chemical and biological…
A retro-Diels–Alder reaction of a β-bicyclo[2.2.2]octadiene-fused precursor yields the doubly N-fused β-benzo[28]hexaphyrin(1.1.1.1.1.1) shown, which undergoes oxidative rearrangement upon treatment with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) to yield a macrocycle that emits fluorescence in the visible/near-I…
The effects of zeolites 4A, 13X, mordenite, and ZSM-5 on the thermal degradation and charring of intumescent ammonium polyphosphate (APP)–pentaerythritol (PER) systems were explored by X-ray photoelectron spectroscopy (XPS) and thermal gravimetric analyses (TGA). The weight loss rate of the third main degradation step…
The direct extrusion foaming process of low-density polypropylene (PP) in a typical single-screw extruder is researched. Effects of five variables on the volume expansion behavior and cellular morphologies are investigated. They are three kinds of polypropylene with different melt flow rates (MFRs), two kinds of chemi…
Compressive properties and failure analysis of unidirectional and plain weave S2-glass/vinylester composites under high strain rate (HSR) loading have been investigated using the Split Hopkinson Pressure Bar (SHPB) technique. A systematic experimental approach has been adopted in this work to identify the damage progr…
The generation of nanosized features via the bottom-up organization of individual atoms and molecules represents one of the most rapidly emerging fields in modern science and technology. In order to gain general and modular access to nanostructures, a construction kit consisting of molecular building blocks with defin…
Rigid polyurethane foams are used as thermal or vibration insulators and energy absorption material, and are often molded directly in place, where a smooth, thin skin forms between the mold and the cellular structure. Density gradients and the presence of a skin are known to affect the mechanical properties of the foa…
Abstract Polymer blends based on polyolefins are of a great interest owing to their broad spectrum of properties and practical applications. However, because of poor compatibilities of components, most of these systems generally exhibit high interfacial tension, a low degree of dispersion and poor mechanical propertie…
Abstract Solvothermal Synthesis and Crystal Structure Determination of AgBiI 4 and Ag 3 BiI 6 AgBiI 4 and Ag 3 BiI 6 were synthesized by solvothermal reaction from AgI and BiI 3 in diluted HI‐solution (20 %) at a temperature of 160 °C. The greyish‐black crystals grow as octahedra (AgBiI 4 ) or hexagonal/trigonal plate…
We study one- and two-dimensional transmission of electromagnetic waves through a finite slab of a dielectric material with negative refraction. In the case when the dielectric slab possesses an intensitydependent nonlinear response, we observe the nonlinearity-induced wave transmission through an opaque slab accompan…
A new twist: Structural twisting by about 32° between the semiquinoneiminecopper(II) entities in 2 caused by weak Cu–S interaction results in a different spin arrangement (↑,↓,↑) than for planar 1 (↑,↑,↓). Most revealingly, 2 has an EPR spectrum typical for a radical whereas 1 displays a signal for a CuII center. Oxid…
Historically, each of the three macromolecular architectural classes, i.e. (I) linear, (II) crosslinked, and (III) branched, has spawned rich polymer science. These architectural discoveries have been characterized by the emergence of new syntheses, structures, phenomena, properties, and products that have dramaticall…
Blocking out aggregation: Triblock copolymers consisting of a central β-sheet polypeptide block with the repeating [(AlaGly)3GluGly]n sequence and poly(ethylene glycol) (PEG) of Mn=750 g mol−1 were prepared and the assembly properties in the solid state were investigated. Attachment of PEG prevented the macroscopic ag…
We report diffusion Monte Carlo (DMC) calculations on MgO in the rock-salt and CsCl structures. The calculations are based on Hartree-Fock pseudopotentials, with the single-particle orbitals entering the correlated wave function being represented by a systematically convergeable cubic-spline basis. Systematic tests ar…
In this study, three-layer particleboards are produced from a mixture of sunflower stalks (Helianthus annuus L.) and poplar wood (Populus alba L.) at certain ratios utilizing urea-formaldehyde (UF) adhesives. Panels with a density of 0.7 g/cm 3 are manufactured with the ratios of 25, 50, and 75 percent particles from…