Materials Literature
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A linear polymer chain in good solvent condition with one end grafted on a infinitely large, impenetrable flat surface is investigated using dynamic Monte Carlo simulation on a simple cubic lattice. Chain shape and dimension, angular correlation between the direction of the end-to-end vector and that of the longest pr…
Abstract Raman and IR studies were performed for the first time for a single crystal of KNbW 2 O 9 belonging to the novel class of valence‐balanced compounds crystallizing in the structure of hexagonal tungsten bronze and exhibiting ferroelectric properties. The observed vibrational modes were assigned to the respecti…
Low molecular weight oligomers of poly- (ethylene terephthalate) (PET) and poly(ethylene naphthalate) (PEN) were synthesized and the crystallization behavior were examined. The crystallized oligomers underwent solid state polymerization (SSP) when subjected to temperatures close to melting temperature under nitrogen.…
With increasing number of loading cycles, stress-strain hysteresis loops of pseudoelasticity of a shape memory alloy vary continuously in experiments. To account for such characteristic variance observed during phase transformations, the effect of residual martensite is taken into account in a thermomechanical model b…
The scanning reference electrode technique (SRET) has been used to determine the influence of Al content on the kinetics of localized corrosion processes occurring on the intact surface of Al-Zn alloy-coated steel. Three commercial hot-dipped coatings were investigated: Galvatite (0.15%Al-Zn), Galfan (4.3%Al-Zn), and…
The authors developed ABI alloy, which mechanically resembles stainless steel 316. The main elements of ABI alloy are palladium and silver. Magnetic resonance (MR) images and radiographs of ABI alloy and stainless steel 316 stent models and of nitinol, tantalum, and Elgiloy stents were compared. ABI alloy showed the l…
Semi-interpenetrating hydrogel networks (IPNs) composed of poly(2-hydroxyethyl methacrylate), PHEMA, and poly[(D,L-lactic acid)-co-(ε-caprolactam)], copoly(D,L-LA/ε-CLM), were synthesized. Linear copoly(D,L-LA/ε-CLM) chains were interpenetrated into the crosslinked three-dimensional networks of PHEMA. Physical propert…
Low-stress creep measurements on a nematic liquid crystal polymer indicate that it is a viscoelastic solid, with a modulus of 100 dynes / cm 2 and a yield stress of 50 dynes / cm 2 . Both smectics and nematics are viscoelastic solids at very low stress levels, with a modulus that is related to their defect texture. At…
A self-consistent model for the constitutive behavior of polycrystalline barium titanate is presented. More generally, the model is valid for any ferroelectric material that changes its remanent polarization state primarily due to 180° switching, i.e. switching with no change in the remanent strain state. We will assu…
Ab initio NMR gauge-including atomic orbital (GIAO) calculations were used to constrain assignments of resonances in 27 Al NMR spectra of F-bearing alkali aluminosilicate glasses. The effect of bond angles within the range 126-150° on the chemical shift was investigated using cluster models of next-nearest atoms that…
This paper deals with the evaluation of the insulation design of polymer housed surge arresters for distribution lines. Five commercial designs were tested in a salt fog chamber for 9 cycles using a cycle consisting of 120 hours of salt fog that was followed by a 48 hour rest period for a total of 1280 hours of salt f…
Morpholine-2,5-dione and D,L-3-methylmorpholine-2,5-dione were polymerized with 2,2-dibutyl-2-stanna-1,3-dioxepane (DSDOP) as initiator with variation of time and monomer/initiator (M/I)-ratio. For comparison a few polymerizations were initiated with Sn(II) 2-ethylhexanoate. The DSDOP initiated polymerizations gave sl…
The tree initiation voltage of impregnated crosslinked polyethylene (XLPE) with a dielectric liquid is drastically improved compared to normal XLPE for both ac and impulse voltage application. It is considered that liquid fills the polymer free volume, and removes space for electrons to be accelerated to high energy.…
A novel mechanism for debonding at a weak interphase in an all‐oxide composite is introduced. This methodology involves the use of alumina platelets that have a diameter of 10–15 or 5–10 μm and a thickness of 1 μm. The platelets induce constrained sintering of the ceramic powder, which results in permanent porosity. F…
Current–voltage j(V) characteristics of barium titanate based positive temperature coefficient of resistivity thermistors were analyzed in terms of space charge limited current, trap-filled limited current, Frenkel–Poole, double-Schottky barrier, and small radii polaron models. It is shown that for the double-Schottky…
Abstract This paper concentrated on the objective evaluation of total hand value in knitted fabrics using the theory of neural networks and the comparison of two methods. For the objective evaluation of overall hand feeling in knitted fabric, 47 kinds of weft‐knitted and warp‐knitted fabrics were manufactured. The opt…
The cholesteric liquid crystal (CLC) phase may selectively reflect light. The reflection wavelength is correlated with the CLC helical pitch and the wavelength bandwidth δδ with the birefringence. Recent studies have aimed to broaden δδ from several tens - an order of magnitude usually encountered in literature - to s…
Characteristics of the dielectric relaxation mechanisms (γ, β, β’, α and ρ) in poly(methyl methacrylate) (PMMA) and hybrids of PMMA polymerized into 5 nm SiO2 pore matrices were studied by means of the thermally stimulated depolarization currents (TSD) technique, applied in the range 10–460 K. Low frequency relaxation…
A robust evolutionary approach is proposed for the synthesis of multilayer coatings at oblique light incidence. The proposed approach consists of global and local strategies by integrating decreasing mutations and self-adaptive mutations via family competition and adaptive rules. Numerical results calculated at normal…
The effect of the gamma-irradiation on the mechanical properties of the composites, Polypropylene (PP), PP+high density Polyethylene (HDPE), PP+ HDPE+wood flour, where HDPE is virgin and recycled, was studied. This paper discusses the behavior of the composites after exposure to various doses of gamma irradiation (1–7…