Materials Literature
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Low Tg copolymers of [11(N-carbazolyl)undecylmethacrylate] and [2,5-dimethylphenyl-[(4-nitrophenyl)azo]-phenoxyalkylmethacrylate] have been synthesized and the polarized light-induced birefringence of thick films (70 μm) has been investigated at a constant deducted temperature relative to Tg (T − Tg = 10 °C). The opti…
A mathematical model is developed to simulate the rheological behavior of fabric bagging. The model is based on the assumption that stress-strain relationships in fabric consist of three essential components: elastic deformation and viscoelastic deformation of fibers and the friction between fibers and yarns within th…
The synthesis, characterization and X-ray structure of an hexapyrrolic macrocycle, [26]hexaphyrin(1.1.1.1.0.0), is reported; it is characterized by a partially inverted structure.
Tubes from zirconium-base alloys are used widely in the pressure tube reactor core. The lifetime of the zirconium component in the reactor core will be determined by structure changes and alloy properties under long-term neutron irradiation. The studies were carried out using Zr-1Sn-1Nb-0.4Fe (E635) and Zr-2.5Nb (E125…
The synergistic activity of binary accelerator systems in rubber vulcanization is well known. Thiourea and its derivatives are important secondary accelerators in this context. It is suggested that thiourea containing binary systems of rubber vulcanization proceed by a nucleophilic reaction mechanism. Amidinothioureas…
Crystallization behavior of natural rubber prepared by different procedures, such as skim rubber, deproteinized natural rubber (DPNR), and pale crepe, was investigated by dilatometry at −25°C. DPNR was fractionated into four fractions by molecular weight. The high molecular weight fractions contained about 1.7 linked…
A method for the calculation of atomic polarizabilities based on the variational method for the calculation of the electronic polarizability in terms of the neglect of differential diatomic overlap (NDDO) approximation is presented. The resulting atomic polarizability tensors are additive. Calculation of an extended t…
Based on a multiscale asymptotic technique, a weakly nonlinear theory of rectified heat transfer to vapor bubbles is developed. The theory takes into account effects of internal and external heat transfer near the bubbles including memory terms, viscosity and slight compressibility of the liquid, surface tension, and…
Melt blending of thermoplastic polyurethane (TPU)/ammonium polyphosphate (APP) additives in a polypropylene matrix improves fire proper ties of the polypropylene-based materials via an intumescence process. In this study, the protective effect of intumescence is studied considering the thermal stability of a particula…
An X-ray crystal structure of the methylbenzodithiazolyl radical MeC6H3S2N˙, MBDTA, reveals that it forms a regularly spaced π-stack motif in the solid state; variable temperature magnetic studies show that the susceptibility passes through a broad maximum at 140 K indicative of exceptionally strong antiferromagnetic…
The excitation of the triplet exciton leading to the "long‐lived" photoluminescence characteristic of a porous silicon (PS) surface has been used to selectively enhance the highly efficient, controlled, and patterned plating of copper and silver metal from electroless solutions. The basis of this method lies in the us…
Two derivative ligands of diethylenetriamine-N,N,N′,N′′,N′′-pentaacetic acid (H5DTPA; H5L1) were synthesized: the symmetric and asymmetric mono(methylamides) DTPA-N′-MA (H4L3) and DTPA-N-MA (H4L4). The protonation constants (log KiH) of L3 and L4 were obtained by pH-potentiometric titration: 10.04, 8.41, 2.73, 1.94 an…
Photoelectrochemical experiments have been carried out for characterizing passive films on Mo‐Ta sputtered alloys having different compositions, as well as on pure Mo and Ta metals. Both corrosion layers, formed by simple immersion in solution, and films grown anodically were investigated. The presence of Mo species i…
In this paper we examine nonradiative processes (cross relaxation and energy migration) vital for the generation of blue avalanche emission in ${\mathrm{T}\mathrm{m}:\mathrm{L}\mathrm{i}\mathrm{Y}\mathrm{F}}_{4}$ crystals subjected to radiation near 648 nm. Time-domain and temperature-dependent measurements indicate t…
A UNESCO designated World Heritage Site, the city of Bath has many important listed buildings largely constructed of limestone from local quarries. Among present day atmospheric pollutants, SO2 is particularly damaging to calcareous stone, although its levels are decreasing with the use of low sulphur oil and coal, fl…
Contributors Preface to the 1995 Edition Preface to Reprint Volumes Acronyms Crystal Structure Nomenclature 1 Factors Governing Crystal Structures Pierre Villars 2 Close-Packed Structures Jurgen Hauck and Klaus Mika 3 Body-Centered Cubic Derivative Structures Erwin E. Hellner and Roland Schwarz 4 Wurtzite and Sphaleri…
With tetrahydrofuran as a solvent and pyridium p-toluenesulfonate as a catalyst, the hydroxyalkyl vinyl ethers 2-hydroxyethyl vinyl ether (2E), 4-hydroxybutyl vinyl ether (4B), and 6-hydroxyhexyl vinyl ether (6H) underwent step-growth self-polyaddition, generating polymers with an acetal main-chain structure. The mole…
Differential scanning calorimetry (DSC) is one of the most used methods for kinetic studies of thermoset cure reactions. The basic assumption made in this technique is the proportionality between the heat generation rate and cure reaction rate. To have access to the heat generation rate that provides information about…
The production of spherical crystals has recently gained great attention due to the fact that the crystal habit (form, surface, size, etc.) can be modified during the crystallization process. Spherical crystals of ASA were developed by non-typical and typical spherical crystallization techniques. The non-typical spher…
Blends of two or more ethylene–styrene (ES) copolymers that differed primarily in the comonomer composition of the copolymers were studied. Available thermodynamic models for copolymer–copolymer blends were utilized to determine the criteria for miscibility between two ES copolymers differing in styrene content and al…