Materials Literature
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Abstract Previously introduced method for transforming kinetic function expression was applied on the differential form of isothermal Johnson–Mehl–Avrami (JMA) nucleation and growth equation, to determine the duration of the induction period, τ. The assisting function φ = t m was used to obtain a new equation, which e…
Abstract This article reports on the influence of the paraffin (PAR) on the wood fiber (WF) dispersion in different polyethylene (low‐density polyethylene, high‐density polyethylene, recycled polyethylene) matrices, as well as on the melt flow behavior and mechanical properties of WF‐reinforced polyethylene (PE) compo…
Species composition and ecological preferences of the most important periphytic diatom taxa were studied in lentic ecosystems in the salt marshes of Emporda wetlands (NE Spain). Correspondence analysis with the diatom communities suggested that water confinement/flooding gradient and productivity of the system were th…
We present the results of electrical resistivity and Hall effect measurements on single crystals of HfNiSn, TiPtSn, and TiNiSn. Semiconducting behavior is observed in each case, involving the transport of a small number of highly compensated carriers. Magnetization measurements suggest that impurities and site disorde…
Abstract The influences of the deacetylation temperature, deacetylation time, and NaOH concentration on the degree of deacetylation (DD) of deacetylated products prepared from β‐chitin are discussed. The DD values of deacetylated products are related to the ratio of the signal intensities of methyl on acetyl groups an…
For use in micro-patterned scaffolds in tissue engineering, novel diacrylated triblock macromers (PLA-b-PCL-b-PLA, PGA-b-PCL-b-PGA and PCL-b-PEO-b-PCL) were synthesized and characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (…
Damage accumulation due to cascade overlap, which was simulated previously, has been used to study the changes in elastic constants and the bulk and elastic moduli as a function of dose in SiC. These mechanical properties generally decrease with increasing dose, and the rapid decrease at low-dose levels indicates that…
Abstract The effect of surface chemistry on proliferation and morphology of bone cells cultured on surface modified poly(3‐hydroxybutrate‐ co ‐3‐hydroxyvalerate) (PHBV) and untreated PHBV was evaluated. The surface of cast PHBV film was physically and chemically immobilized with collagen. For preparing chemically immo…
Incompletely condensed silsesquioxanes of the type R7Si7O9(O[SiR'2O]n)OH (R = c-C5H9, c-C6H11; R' = Me, Ph; n = 1-4), containing a siloxane ring of variable size and rigidity and a remaining silanol, are described. Compared with a truly isolated silanol [R7Si8O12(OH)], solution and solid state FT-IR spectra of these c…
Abstract Summary: A diblock copolymer brush consisting of poly(methyl acrylate)‐ block ‐poly(pentafluoropropyl acrylate) (Si/SiO 2 //PMA‐ b ‐PPFA) was synthesized on a porous silica substrate. The brush was exposed to selective solvents, as well as thermal treatments, to induce a surface rearrangement. The rearrangeme…
Abstract The adsorption of phenylacetylene (PA) on gold nanoparticle surfaces was investigated by means of surface‐enhanced Raman scattering (SERS). The aggregation behaviors were examined by UV–visible absorption spectroscopy and transmission electron microscopy. The phenyl ring of PA appeared to assume a perpendicul…
The frictional behavior of diamond-like carbon (DLC) films varies with environmental condition. One theory asserts that the cause of variations in the frictional performance is environmental contaminants adsorbing onto the DLC film surface. Testing of the frictional performance of DLC films in a pin-on-disk contact ha…
Abstract Lead was removed from lead silicate glass 7.3Na2O–6.4K2O–3.7MgO–5.4CaO–66.4SiO2–7.8PbO–3Al2O3 (mol %), used in color television CRT funnel, utilizing a subcritical hydrothermal treatment at 628 K and 24 MPa followed by acid leaching at 373 K. This process may be used to prevent disposal of lead containing was…
Secondary electron spectra have been collected from both pure elements and from compounds examined under conditions approximating those found in a scanning electron microscope. Despite the presence of substantial surface contamination these spectra are found to be reproducible and characteristic of the underlying mate…
Abstract Titanate pyrochlores R2Ti2O7 (R = Y, rare earth) were synthesized by a polymerized complex (PC) technique and used as photocatalysts for the splitting of water into H2 and O2. NiOx-loaded Y2Ti2O7, the first example of an active photocatalyst with a pyrochlore structure, demonstrated efficient evolution of H2…
Abstract Plastic fiber composites, consisting of polypropylene (PP) or polyethylene (PE), and pinewood, big blue stem (BBS), soybean hulls, or distillers dried grain and solubles (DDGS), were prepared by extrusion. Young's modulus, tensile and flexural strengths, melt flow, shrinkage, and impact energy, with respect t…
Abstract Blends of bacterial poly(3‐hydoroxyalkanoate) (PHA) with a medium‐length side chain and polylactide (PLA), and blends of the chemically modified PHA (ePHA) with PLA, were prepared. The morphologies, some physical properties, and thermal behavior of the blends based on PLA were investigated by electron microsc…
Abstract High‐performance shape‐memory polyurethane block copolymers, prepared with two types of poly(tetramethylene glycol) (PTMG) used as soft segments, were investigated for their mechanical properties. Copolymers with a random or block soft‐segment arrangement had higher stresses at break and elongations at break…
Abstract The main objective of this study was to synthesize and characterize the properties of ethylene–propylene–diene terpolymer (EPDM)/clay nanocomposites. Pristine clay, sodium montmorillonite (Na + –MMT), was intercalated with hexadecyl ammonium ion to form modified organoclay (16Me–MMT) and the effect of interca…
Syntheses of wholly natural polymeric linseed oil (PLO) containing peroxide groups have been reported. Peroxidation, epoxidation and/or perepoxidation reactions of linseed oil, either under air or under oxygen flow at room temperature, resulted in polymeric peroxides, PLO-air and PLO-ofl, containing 1.3 and 3.5 wt.-%…