Materials Literature
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Abstract Controlled grafting of well‐defined polymer brushes on the poly(vinylidene fluoride) (PVDF) films was carried out by the surface‐initiated atom transfer radical polymerization (ATRP). Surface‐initiators were immobilized on the PVDF films by surface hydroxylation and esterification of the hydroxyl groups coval…
Abstract Polystyrene (PS)/ZnAl layered double‐hydroxide (LDH) nanocomposites were synthesized via in situ emulsion and suspension polymerization in the presence of N ‐lauroyl‐glutamate surfactant and long‐chain spacer and characterized with elemental analysis, Fourier transform infrared spectrum, X‐ray diffraction (XR…
Abstract A multiepoxy cubic silsesquioxane was prepared by the hydrolysis and polycondensation of trifunctional monomer (γ‐glycidoxypropyl)trimethoxysilane in a solvent mixture of methyl isobutyl ketone and anhydrous ethanol with a tetraethyl ammonium hydroxide aqueous solution acting as the catalyst, and it was succe…
A new method is described for surface functionalization of silicon nanocrystals. Organic monolayers were self-assembled via gas-phase adsorption of amines, alkenes, alkynes, and aldehydes onto the surfaces of aerosolized crystalline silicon nanoparticles of 12.2 nm diameter in an atmospheric pressure tube reactor. Ass…
Sequenzielle Belegung von Siliciumoxidkügelchen durch kovalentes Binden von Magnetitnanopartikeln (blau) und Befestigen von funktionellen Au-, CdSe/ZnS- oder Pd-Nanopartikeln (rot) führte zu multifunktionellen Systemen, in denen Magnetismus mit Oberflächenplasmonenresonanz (Au), Lumineszenz (CdSe/ZnS) bzw. katalytisch…
Abstract Hemp fibers were used as natural reinforcement in composites of thermosetting vegetal oil based resin. Boards with fibers content from 0 to 65 vol % were produced by hot pressing. The mechanical properties were investigated with flexural testing. The effect of effect has been observed on both modulus and stre…
This paper provides a complete physical picture of optical response time as a function of cell gap (d) in a wide voltage regime. Normally both rise and decay times are known to be proportional to d 2 in the small angle approximation (), and in the high voltage regime where V π < V < V i the optical decay time is indep…
Abstract Low generation amino‐group‐terminated poly(ester‐amine) dendrimers PEA1.0 (NH 2 ) 3 and PEA1.5 (NH 2 ) 8 , and poly(amido‐amine) dendrimer PAMAM1.0 (NH 2 ) 4 were used as diglycidyl ether of bisphenol A (DGEBA) epoxy resin hardeners. Thermal behavior and curing kinetics of dendrimer/DGEBA systems were investi…
Abstract Polyaniline and its derivatives have high antioxidative stability and are considered to belong to the most useful conductive polymers for practical application. In this work, we have linked 1,4‐phenylenediamine to poly(styrene‐ co ‐chloromethylstyrene) and prepared poly(styrene‐ co ‐ p ‐aminoanilinemethylstyr…
Abstract Miscibility was studied for four polyamide blends of 6I/6T [copolymer consisting of 1,6‐hexamethylene diamine and isophthalic acid (6I) (70 wt %) and terephthalic acid (6T) (30 wt %)] with MXD6 (polyamide of m ‐xylenediamine and adipic acid), BAC6 (polyamide of 1,3‐bis(aminomethyl)cyclohexane and adipic acid)…
Abstract The internal and external curved surfaces of polysulfone hollow fiber membranes were characterized by atomic force microscopy (AFM), contact angle measurement (CAM), and scanning electron microscopy (SEM) with the aim of improving the membrane surface properties for blood compatibility. Novel approaches were…
Abstract Elastomeric materials are used as barriers to protect workers against exposure to chemicals. The effectiveness of a polymer as a chemical protective material depends on the rate of permeation of chemicals through it. The permeation rate is dependent on the type and amount of fillers added into the polymer mat…
Abstract The thermal cure reactions of phenylethynyl terminated AFR‐PEPA‐4 oligomer and a model compound N ‐phenyl‐[4‐(phenylethynyl) phthalimide] were investigated. The kinetics analysis of the thermal cure of AFR‐PEPA‐4 was determined using DSC, with modified DiBenedetto equation. The activation energy of thermal cu…
This article demonstrates the effect of exfoliated nano-clay on the microcellular foam processing of amorphous and crystalline nylon. Amorphous and crystalline nylon 6 nanocomposites are prepared using a twin-screw extruder. The exfoliated nanocomposite structures are characterized by X-ray diffraction (XRD) and trans…
Abstract Natural fiber composites were designed and optimized to achieve good mechanical properties and resistance to growth of living organisms. Composite materials were prepared from poly(lactic acid) (PLA) with flax fibers, which had been subjected to interstitial polymerization to replace the water in the cellulos…
UreG is an essential protein for the in vivo activation of urease. In a previous study, UreG from Bacillus pasteurii was shown to behave as an intrinsically unstructured dimeric protein. Here, intrinsic and extrinsic fluorescence experiments were performed, in the absence and presence of denaturant, to provide informa…
The electrical resistivity and tensile properties of composites formed by the incorporation of metal powders such as aluminum (Al), copper (Cu), and iron (Fe) in a high-density polyethylene (HDPE) matrix are investigated. Results are presented for metal fillers content varying between 0 and 55% by volume. The effect o…
Abstract Films of poly(vinyl butyral) composites with triphenyl tetrazolium chloride dye (TTC) and the antioxidant nickel dibutyl dithiocarbamate (NBC) or 2‐mercaptobenzimidazole (MBI) were prepared by the solution casting method using butyl alcohol as a solvent. The effect of various doses of electron beam irradiatio…
Self-condensation of the amphiphilic fluorene trimer occurs in the solvent mixture, giving pure "green" fluorescent nanoparticles with controlled radii of 20-100 nm. The origin of the green fluorescence is attributed to the excimer emission via excitation of aggregated dimer structures in the nanoparticles rather than…
A commercial variable angle spectroscopic ellipsometer from J. A. Woollam Company is modified in order to make possible measurements in guiding structures. The half leaky guided mode technique is realised for liquid crystal optical dispersion measurements. Features and problems related to experimental data interpretat…