Materials Literature
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Abstract An overview is given on auto‐photosensitive polyimides as introduced for the first time in 1985. It is shown how development proceeded and how the chemical basis of auto‐photosensitive polyimides was extended beyond BTDA. Novel “photosensitizer tetracarboxylic dianhydrides” like 2,3,6,7‐thioxanthonetetracarbo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifference ultraviolet spectroscopic studies on the binding of lanthanides to human serum transferrinWesley R. Harris and Yong ChenCite this: Inorg. Chem. 1992, 31, 24, 5001–5006Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published…
A model-based approach to the first-principles study of ferroelectric phase transitions is described. Formal relationships of the various possible models to the full crystal Hamiltonian and connections to phenomenological models in the literature are examined. Specific considerations for application to the perovskite…
Phosphorylation of glial fibrillary acidic protein (GFAP) induces disassembly of the filaments. An amino-terminal fragment of bovine GFAP (G-Hf) was produced by lysylendopeptidase digestion. G-Hf formed ribbon-like filaments in the presence of GFAP even in low ionic strength, whereas the fragment itself did not form a…
Crack tip shielding is evaluated for observed transformation zones in Ce‐TZP/Al 2 O 3 composites, in which the transformation zone sizes were changed significantly by varying the sintering temperature to control the transformation yield stress. The calculated shielding effects are consistent with an observed insensiti…
Potentiodynamic polarization curves were measured for Type AISI 304 and 316 stainless steels in solution at 4, 20, and 40°C. The pitting potentials decreased with increasing temperature. A positive effect on the inhibition of passivity breakdown was found in the presence of molybdenum. Surface enhanced Raman spectrosc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel mixed-valence selenium(IV)/selenium(VI) oxo compound: crystal structure determination and x-ray absorption near edge structure study of erbium selenite(IV) selenate(VI) hydrate, Er(SeO3)(SeO4)1/2.cntdot.H2ORussell E. Morris, Angus P. Wilkinson, and Anthony K. Cheetha…
The complex Young’s modulus, E*(ω), and the complex strain-optical coefficient, O*(ω), of poly(α-methyl styrene), PMS, and Bisphenol A polycarbonate, PC, were measured over the frequency range of 1–130 Hz around the glass-to-rubber transition point. The real part of O*(ω), O′, of PMS is negative over the entire temper…
Abstract Relevant developments in polymer blends based on immiscible products have shown how efficient the amphiphilic species are in improving mechanical properties and morphological stabilization throughout successive processing steps. However, it appears that the amount of compatilizer that has to be introduced for…
In order to evaluate the crystallization tendency of glasses, the ratio of the crystallization temperature to the liquidus temperature ( T c / T L ) was obtained by DTA measurement for the Na 2 O–B 2 O 3 and Na 2 O–B 2 O 3 –Al 2 O 3 systems. The critical cooling rate for glass formation ( Q *) was also measured. The m…
Infrared reflection absorption spectroscopy has been used to study the chemisorption of fluorine (by exposure to XeF2) on polycrystalline Si surfaces in ultrahigh vacuum and under low-pressure steady-state conditions. Adsorption at 300 K leads to the sequential formation of mono-, di-, and trifluoride SiFx groups. Ann…
The thermal unfolding of ribonuclease T1 has been studied by high-sensitivity differential scanning calorimetry as a function of temperature, [GuHCl], and scanning rate. The destabilizing effect of GuHCl has revealed that the kinetics of the unfolding transition become extremely slow as the transition temperature decr…
The crystal structure of ribonuclease A with bound thymidylic acid tetramer is reported at 2.5-A resolution. The diffusion of the tetramer into native orthorhombic crystals of the ribonuclease allows for the formation of a structurally stable complex where the single-stranded nucleic acid enters and leaves the enzyme'…
Abstract Certain AB or AA and BB Diels‐Alder polymer precursors bearing maleimide and furan segments were synthesized, characterized, and polymerized. Particularly, the monomaleamic acid derived from 4,4'‐diaminodiphenylmethane, reacted with the monofurfurylpyromellitamic acid to yield a triamic acid which was cyclode…
The mean resistance of a one-dimensional wire is calculated with the use of Landauer formula for three types of arrangements: the random, Thue-Morse, and Fibonacci chain for which the positions of the atoms and the scattering strengths are modulated according to the prescribed rules. Comparison of the obtained numeric…
The changing fortunes of the mechanical theory of adhesion are traced from McBain and Hopkin's work in the 1920s to that of Venables in the 1970s and 1980s. Some comments are made on the factors which were associated with changes, during the period surveyed, in the accepted view of the importance of the theory.
Cooperative effects involved with the radiation and scattering of sound by gas bubbles distributed in liquids is investigated analytically. Bubble interaction through the common friction radiation field is taken into account. It is shown that mutual interaction may lead to synchronization of the bubble oscillations an…
Abstract Direct grafting of polystyrene onto polyethylene has been carried out in a twin screw extruder with an organic peroxide and a crosslinking co‐agent. The reaction extruded blends exhibited enhancement in impact properties at an optimum level of peroxide and co‐agent. Further improvement was achieved by introdu…
Rates of menstrual disorders were studied in 231 female production workers with high exposure to toluene (mean 88 (range 50-150 ppm) in a factory manufacturing audio speakers and compared with a control group of 58 female production workers in other departments in the same factory who had little or no exposure to tolu…
Polybrominated dibenzofurans (PBDFs) are formed during extrusion of high-impact polystyrene (I) contg. the flame retardant system decabromodiphenyl ether(II)/Sb2O3. The process of formation of PBDFs was examd. at an extrusion temp. of 275 °. To get a better understanding of processes taking place in the polymer melt d…