Materials Literature
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Abstract Oriented poly(ethylene‐2,6‐naphthalate) (PEN) has been characterised by polarised FT‐IR spectroscopy to determine the structural angles of the transition moments to the molecular chain axis. The bands at 1130 cm −1 , 1142 cm −1 and 1602 cm −1 , which have been previously assigned as having their transition di…
A tunable microwave resonator based on layered ferrite/ferroelectric structures has been developed and characterized. The resonator contained epitaxial yttrium iron garnet films on gadolinium gallium garnet and thick plates of barium strontium titanate (BST). The resonance observed in S 11 characteristics at 4 GHz, wi…
Purpose The paper sets out to formulate the intermolecular forces leading to Barkhausen instability. In the approach the known concept of effective field is used within the framework of the T ( x ) model. The aim is to provide a mathematical tool to theoreticians and applied scientists in magnetism that is easier to u…
The title compounds were synthesized from potassium rich mixtures of Fe 2 O 3 , elemental potassium and the hyperoxide KO 2 by applying short reaction times, a maximum temperature of 875 K and subsequent quenching of the samples. The structures of the two new oxoferrates(III) have been determined by single crystal X-r…
Abstract A novel facile method was developed to prepare methylcellulose from miscanthus, cardoon and eucalyptus. Pulps were obtained by the impregnation rapid steam pulping process (IRSP). A total-chlorine-free (TCF) method was used to bleach the pulps with hydrogen peroxide. Bleached pulps were mercerized in 40% NaOH…
XPS measurements of poly(sulfone resin) recorded with a SSX-100 spectrometer in standardized experimental conditions are presented: survey scan, high resolution core level spectra as well as the energy loss regions of carbon, sulphur and oxygen peaks are analyzed. This is part of a contract work aiming to record spect…
Metal-free and metallo-phthalocyanines (M=Cu, Ni, Co, Zn) carrying four N-(n-octyl)mercapto acetamide group on peripheral positions have been synthesized from the corresponding phthalonitrile derivatives in the presence or the absence of anhydrous metal salt (CuCl, NiCl2, CoCI2, Zn(CH3COO)2). The novel compounds have…
1,3‐Bis(4‐hydroxyphenyl)propenone (BHPP) and 3‐(4‐hydroxy‐3‐methoxy phenyl)‐1‐(4‐hydroxyphenyl)propenone (HMPHPP) were used as monomers for preparing photosensitive phosphorus containing polyesters. The photosensitive monomers BHPP and HMPHPP were prepared respectively by refluxing 4‐hydroxybenzaldehyde and 3‐methoxy‐…
Purpose The increase of the accuracy of a mathematical model of hysteresis by the choice of the optimum saturation curve for a given material. Design/methodology/approach Hysteresis loops of typical soft magnetic materials are approximated with the help of the Taka´cs magnetization model using different saturation cur…
New silicon-containing poly(amide-imide)s have been synthesized by direct polycondensation of various aromatic diamines with a dicarboxylic acid containing the dimethylsilylene group and preformed imide cycles. These polymers are easily soluble in polar amidic solvents such as N-methylpyrrolidinone (NMP) or dimethylfo…
Abstract A ZSM-5/Y composite zeolite was prepared from Y synthesis gel by using an in-situ two-step hydrothermal crystallization process. Optimized synthetic parameters made it practical to control the transformation of zeolite Y to P, or other undesired phases during ZSM-5/Y composite formation. It was found that the…
Abstract Ultrasound treatment, as an alternative to chemical and radiation-based processes, is an interesting technique for the modification of average molecular weights of natural and synthetic polymers in aqueous solution. Degradation is the observed main effect for strongly hydrophilic compounds - poly(acrylic acid…
The structural, dielectric and conductive properties of [(CH 2 ) 3 (NH 3 ) 2 ]Cu(II)Cl 4 have been studied. The material shows an order-disorder transition at T 1 = (333±2) K and a ferroelectric phase transitions at T 2 = (434±3) K. Results of differential thermal analysis, infrared spectroscopy, X-ray diffraction, AC…
XPS measurements of poly(styrene) recorded with a SSX-100 spectrometer in standardized experimental conditions are presented: survey scan, high resolution core level spectra as well as the energy loss regions of carbon peaks are analyzed. This is part of a contract work aiming to record spectra in the very same condit…
Abstract A review of the application of electron microscopy to disordered materials exhibiting sharp, highly structured diffuse intensity distributions is given from a modulation wave approach perspective. Structurally useful diffraction phenomena such as polarization, overall diffuse distribution shape and pseudo-ext…
A short history of the developments of the successive dichotomy method for powder pattern indexing is presented. In the first computer powder indexing programs (P1 and P2), only high lattice symmetries, down to orthorhombic, were considered [Louër and Louër, J. Appl. Crystallogr. 5, 271–275 (1972)]. Later on, an exten…
In this article two examples of hexatic phases have been presented to show that the highly ordered phases can be either the ferro- or antiferroelectric ones. Some of them display a well-developed helicoidal structure, very high spontaneous polarization and low conductivity in contrast to liquid-like phases in higher t…
Abstract The hemicellulose content of pulp is dependent on different factors, such as the wood species, the conditions with cooking and bleaching harmonised with the application. In addition to the hemicellulose content, a special interest for the valuation of pulp and the decision of arrangements of the production pr…
Chlorinated PVC (CPVC) is widely used for high temperature applications, e.g. hot water pipes. To improve processing, it is usually mixed with PVC. These systems are brittle, therefore impact modifiers are also added to CPVC formulations. The usual modifiers are MBS types. In spite of chemical similarity, chlorinated…
Abstract The addition of an inorganic component to polymers leads to improvements in various physical and mechanical properties. Various examples on filled elastomeric networks will show that a mechanical characterization can be nicely combined with a spectroscopic investigation for a better understanding of the prope…