Materials Literature
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Nonwovens are widely used in technical applications and for composite preforms. The current technology of forming 3D shapes from flat webs is inefficient and results in uneven final products due to joints. The technology presented in this paper enables the production of 3D preforms directly from fibers, thus eliminati…
Vinyl or amino-benzene sulfonates (VBS and ABS) are polymerised in situ after a soft thermal treatment ( T = 473 K) between the sheets of layered double hydroxides (LDH). The reaction of polymerisation is studied either by 13 C CP- MAS NMR or ESR spectroscopies. The resonance peak associated to the vinyl group disappe…
The viscoelastic properties of the sewing thread before and after loading in the sewing process were investigated. Sewing threads are subjected to dynamic tension and friction in the sewing process. In order to compare polyester, cotton and silk sewing threads, the fineness of the threads were selected to be almost eq…
Abstract In this study, the toughening effect of nylon66 on the PPS/glass fiber composite at various nylon66 contents and testing temperatures was analyzed using tensile and notched Izod impact test. Also, the corresponding fracture surface morphology was observed and analyzed. Mechanical properties such as strain at…
Abstract In order to study the dynamic‐mechanical properties of Poly(L‐lactide)/Hydroxyapatite (PLLA/HA) composites, two different molecular weight (inherent viscosity (η inh ): 4.0 (dL/g), and 7.8 (dL/g)) poly(L‐lactide) (PLLA) were synthesized by bulk polymerization and filled with 10%, 30%, and 50% (w/w) with medic…
Using adjustable speed drives employing fast switching components to supply low voltage asynchronous motors may be detrimental to their reliability in some cases. The premature failures of the insulating materials are often attributed to the existence of partial discharges (PD) in the windings. Nevertheless, a clear e…
Novel azopyridine-containing supramolecular liquid crystalline (LC) materials built via 1 : 1-heterointermolecular hydrogen bonding between some 4-substituted phenyl-4′-azopyridines and 4-n-alkyloxybenzoic acids are reported. These hydrogen-bonded LC complexes exhibit well defined nematic, smectic A and smectic C phas…
Abstract Volatile by‐products during heat polymerization of soybean oil at 330°C were analyzed using GC‐MS and NMR. Color and viscosity changes were monitored for the heat‐polymerized soybean oil and the by‐products. About 90% (w/w) of the by‐products were decanoic, palmitic, linoleic, oleic, and stearic acids and cis…
A novel chemo- and diastereoselective aerobic epoxidation of the N-cinnamoyl peptides catalyzed by polyaniline-supported cobalt(II) salen (PASCOS) is described. The N-cinnamoyl proline derived peptides 1 show a high pi-facial selectivity during these epoxidations. The origin of this diastereoselectivity in 1 has been…
In this study, an intelligent R&D design system is used to obtain the best combination of weaving parameters for woven fabric designs. The searching mechanism, developed in the Turbo C programming environment, and the theory, based on a genetic algorithm, can find several desired solutions of weaving parameters to…
Abstract The loss of K-bearing clay minerals has been observed over an 80 y cultivation period in Chinese rice paddies despite the use of NKP fertilizers. Clay mineral determinations were made in flood-irrigated paddies cultivated for 3, 10, 15, 30 and 80 y in clayey (45 wt.%), red soils derived from red Quaternary se…
Pitting corrosion of Type 904L (UNS N08904) stainless steel was investigated using the potentiodynamic polarization technique in different bromide concentrations, as well as in 0.6 M sodium bromide (NaBr) in the presence of some inorganic compounds at elevated temperatures. The critical pitting potential (Epit) of the…
Abstract Elastomer materials are used in a wide application range and subjected to different loading from which failure of the material results. Because this failure is caused by initiation and propagation of cracks, the application of fracture mechanics methods for the assessment of the material is obvious. A short s…
Abstract Blends of polyamide 6 (PA6) and elastomeric ethylene‐octene copolymer (EOR), with and without maleated EOR (EOR‐MA) were studied. EOR‐MA with various amounts of grafted MA and gel content were prepared by reactive extrusion. The effects of EOR‐MA characteristics and composition on the morphology, thermal and…
The design of an achromatic polarisation modulator is presented. The modulator is based on a combination of three electrically switchable non-achromatic ferroelectric liquid crystal retarders. The design follows the idea by Pancharatnam who first introduced suitable achromatic combinations of crystal retarders. We com…
Abstract Solid-state metal hydrides display hydrogen densities close to that of liquid hydrogen and thus provide a safe and efficient way of storing hydrogen. As a result of recent neutron and synchrotron diffraction work some novel metal hydrides have been characterized that shed new light on the nature of metal-hydr…
Two noncentrosymmetric quaternary tin chalcoarsenates, Cs(2)SnAs(2)S(9) (1) and Cs(2)SnAs(2)Se(9) (2), were synthesized by the polychalcoarsenate flux method. Compound 1 crystallizes in the orthorhombic space group Pmc2(1) with a = 7.386(3) A, b = 14.614(5) A, c = 14.417(5) A, and Z = 4. Compound 2 crystallizes in the…
Abstract We report experimental evidence that crystalline neptunium dioxide, NpO 2 (cr), will precipitate from near-neutral aqueous solutions that initially contain NpO 2 + (aq), even under mildly oxidizing conditions. Observed decreases in aqueous Np concentrations with time are balanced by corresponding decreases in…
The author reports an alternative method of caring for the donor sites of split-thickness skin graft that involves the immediate return of superficial thin-layer split skin graft to the donor sites while using the deep split-thickness skin graft for replacement over the defects. The proposed method would decrease the…
Abstract The present article briefly reviews research developments in the area of biomacromolecules and bio‐related macromolecules, whose research papers have been published for several decades preferably in the Macromolecular Journals. The area covers the important classes of macromolecules, polysaccharides (cellulos…