Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Molecular, hydrodynamic, and thermodynamic properties of nylon 11 in meta cresol and 1,1,1,2,2,2-hexafluor-2-propanol (HFIP) solutions, as well as its distribution of molecular weights were investigated by means of viscosimetry, conductimetric titration of end groups, light scattering, and fractionation by successive…
A new class of positive deep ultravoilet (UV) resists consisting of poly(p-disilanylenephenylene)s was developed, in which a disilanylene unit and a phenylene unit are connected alternatively in the polymer main chain. These resists had very high etching resistance against oxygen plasma. The lithographic applications…
In our previous study,1 2,2′-bis(4H-3,1-benzoxazin-4-one) (BNZ) was found to be most effective among the tested chain extenders in coupling hydroxyl terminals of linear polyesters through addition reaction. Detailed studies on BNZ chemistry have been made using poly(ethylene terephthalate) and poly(butylene terephthal…
The courses of the reactions of the epoxides with the various derivatives of imidazole in the concentration range 0.5–25 epox. weight eq./mol imidazole and in the temperature range 80–155°C were studied. All imidazoles from adducts with epoxides very quickly, namely the 1-substituted imidazole 1 : 1 adducts, in case o…
Gels of syndiotacticity-rich poly(vinyl alcohol) (s-PVA) in mixed solvents of water/dimethyl sulfoxide (DMSO) or water/ethylene glycol (EG) were made by chilling at the temperatures of 0–70°C from those solutions with the polymer concentrations below 10g/dL. The melting points of the gels were measured warming the gel…
NaCl polycrystals, produced by press forging of single crystals at 275°C, are deformed in compression at room temperature. The dislocation structure is analysed by transmission electron microscopy as a function of the flow stress. Macroscopic yield of the polycrystals occurs at a stress that is equivalent to the flow…
The intermetallic compound Zr3Fe and its hydrides Zr3FeH5,6 and Zr3FeH6.9 are investigated with Mössbauer spectroscopy and X-ray diffraction. It is found that the three samples represent three different phases in the Zr3Fe-H system exhibiting distinct diffraction patterns and Mössbauer spectra. While the compound Zr3F…
In cyclic deformation experiments precipitation-hardened alloys in many cases show a softening effect after a hardening period. The softening occurs because the precipitates are destructed by gliding dislocations. For the destruction mainly two mechanisms are suggested. i) Disordering of ordered particles or ii) disso…
LEDS is the acronym for low-energy dislocation structures. LEDS are those structures in which the energy per unit length of participating dislocations is minimized through mutual stress-screening. They are characterized by the (virtual) absence of long-range stresses and by an alternation between areas with high and l…
The dense radial structure is a distinct morphology which develops in many diffusive pattern-forming systems. We propose the first model to explain the stability of this structure. Stability arises in this model from the resistivity of the growth channels, which has been neglected in previous analyses. We also report…
ABSTRACT Calcium carbonate scale, the most common oil field scale, normally forms from three-phase fluid systems at various downhole locations. The basic scale formation mechanism of CaCO3 in oil field operations was explained in a recent publication [1]. However, only the very basic model considerations and only a fe…
The use of X-ray diffuse scattering to carry out detailed investigations of vacancy and interstitial loops in ion and neutron irradiated copper is discussed. The theory and interpretation of asymptotic diffuse scattering near Bragg reflections are considered, and calculations are presented for the asymptotic diffuse s…
ABSTRACT There has been evidence of a need for scale inhibitor precipitation squeeze treatment in sandstone as well as in carbonate reservoirs. The Mixed Chelate process was designed to meet that need with the injection of a single solution. Success in the laboratory has been verified with numerous experiments. Succes…
X-ray rocking curves of the Bragg reflexion g = {200} are measured on [001]-orientated Cu single crystals deformed in tension at room temperature up to resolved shear stresses between 26.2 and 75.6 MPa. Forg= (200) and (020) the rocking-curve half widths δβ(ϕ) (the azimuth ϕ denotes the state of rotation of the specim…
Measurements of the temperature dependence of the cyclic flow stress of ultrapure tantalum single crystals (RRR ⪆ 14000) are extended to lower temperatures. After cyclic deformation well into saturation at 400 K, the temperature dependence of the flow stress is measured between 80 and 460 K at five different plastic r…
A detailed model of the long-range internal stress field in the channels of the wall structure of persistent slip bands (PSBs) is developed. It is proposed that the long-range internal stress field consists of a (constant) back stress and an internal forward stress which varies in space and increases from the centre o…
The atomistic fundamentals of the initiation of chemical reactions, combustion, or detonation in a molecular solid system is a largely unexplored area. What is clear is that in many molecular solids, largely van der Waals bonded, the solids largely decompose in a way that destroys the integrity of the well-bound molec…
A sharp peak of dielectric constant which appears at the phase transition between chiral smectic-C and smectic-A phases is found to become clear under dc bias field and in thin cells in which the Goldstone mode originated from the fluctuation of azimuthal angle of molecular long axis corresponding to the winding and u…
The current response was measured in ${\mathrm{K}}_{0.3}$Mo${\mathrm{O}}_{3}$ in the highly conducting state after the switching at low temperatures, both in time domain and in frequency domain. Clear evidence was found which shows that the switching or the strong nonlinear conduction in this temperature range is due…
The electrical dc resistivity of variously prepared polymer--conducting-carbon-black composites has been studied over a wide temperature range (4.2--300 K). For the different composites, the resistivity follows a ln\ensuremath{\rho}\ensuremath{\sim}${T}^{\mathrm{\ensuremath{-}}\ensuremath{\alpha}}$ law over the whole…