Materials Literature
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Blends based on metallocene cycloolefin copolymer (COC) and ethylene-octene copolymer (EOC) have been studied as a function of the blend composition, mixing technology and chemical reactions initiated between the components. In order to examine the effect of reactive blending on the interfacial adhesion as well as on…
This paper reflects our R&D results in the field of functionally graded coating processes. For industrial applications a special architecture for coatings is necessary: because the surface has to withstand environmental attacks, specific physical and mechanical functions and characteristics are required. In the in…
Morphology and mechanical properties of clay/high-functional epoxy nanocomposites are investigated. An intercalated morphology is always observed for clay loadings ≤5 wt %. The glass transition temperature (Tg) of the composites decreases with the clay loading, and the impact strength increases first by 10% at 2 wt% c…
The main changes induced in the Raman spectrum of a -C:H films in the 1200-to 1700-cm −1 frequency region by modification with Cu and Co are ascertained. A comparison of the results obtained with the available data on various carbon structures reveals that the introduction of metals in concentrations comparable to the…
Abstract Poly(ϵ‐caprolactone) was chemically modified by using dicumyl peroxide from 0.25 to 2 % (w/w) and the effects of molecular architecture on the density and morphology of PCL foams were examined. The polymer was first blended with dicumyl peroxide at a low temperature (80°C), to prevent premature peroxide decom…
The effects of melt temperature T i and quenching rate V i on the structure and optical properties of As2S3 glasses is studied. It is found that the glass band gap increases with T i and V i , whereas a decrease is observed in the glass density, refractive index (from 2.71 to 2.48), and two-photon absorption coefficie…
The thermal stability was investigated for ethylene propylene diene terpolymer (EPDM) rubber loaded with different white and black fillers, namely, kaolin, quartz, polyvinylchloride PVC, talc, graphite, medium thermal carbon black MT, semi reinforcing furnace black SRF, and high abrasion carbon black HAF. The fillers…
Metastable pitting behavior for two grades of austenitic stainless steels, Type 304L (UNS S30403) and Type 316L (UNS S31603), has been investigated for a range of controlled hydrodynamic conditions: static, laminar, and turbulent (Reynolds numbers of 1,000, 2,000, 3,000, 10,000, 50,000, and 75,000). Metastable pitting…
In high voltage SF/sub 6/ insulated switchgear, the level of SF/sub 6/ concentration needs to be monitored regularly because of its degradation by switching arcs and on-going partial discharges or coronas. In the work reported here, measurements of SF/sub 6/ dissociation rate following 75 /spl mu/A positive and negati…
Boron carbon nitride (BCN) films with a low dielectric constant are synthesized by plasma-assisted chemical-vapor deposition. The dielectric constant is measured for the BCN films irradiated with monochromatic ultraviolet lights of 300 and 365 nm in wavelength. It is found that the dielectric constant is decreased due…
Purpose To evaluate the performance of the compatibiliser of epoxidised soyabean oil‐free fatty acid prepared on the NBR/EPDM blends compared with maleic anhydride and also to explore the effect of loading the compatibiliser NBR/EPDM rubber blend with unmodified and modified polypropylene fibres on the mechanical prop…
Abstract A new reaction-controlled phase-transfer catalyst system has been designed and synthesized. In this system, heteropoly blue, [C7H7N(CH3)3]3PMo4O16, is used for the catalytic epoxidation of olefins with H2O2 as the oxidant. In this system, the catalyst not only can be recovered, like heterogeneous catalyst, bu…
Photoluminescence (PL), reflectance and photoreflectance (PR) spectra were measured on hexagonal CdS films grown directly on hydrogen-terminated Si(111) substrates with 3° off-orientation by hot-wall epitaxy technique. By comparing the PL spectrum to the reflectance and PR spectra in the excitonic energy range, we hav…
Abstract The origin of internal stresses in a polymeric component, subjected to an arbitrary cooling, will be described. The differential volume relaxation arising as a result of the different thermal history suffered by each body point was considered as the primary source of stresses build up. A numerical routine was…
In this work we investigate the influence of self-affine roughness parameters on the pull-in voltage in capacitive microelectromechanical devices. The capacitor plate roughness is considered as self-affine type, which is described by the roughness amplitude w, the lateral correlation length ξ, and the roughness expone…
For a better understanding of the relationship between the microstructure of UNS S31803 duplex stainless steel (DSS) and the shape of the polarization curves, this study evaluated the influence of the microstructure on the potentiodynamic polarization of the 850°C isothermal-aged UNS S31803 DSS in 0.5 M sulfuric acid…
In 2003, a joint research project entitled “Nano and graded thermoelectric materials/Photovoltaic-thermoelectric-wind power generation” is established in cooperation among research institutes from Japan and China. The major research institutes include State Key Laboratory of Advanced Technology for Materials Synthesis…
We investigate the structure of 1/3⟨111⟩ disconnections at Σ3 {111} twin boundaries in gold. Our high-resolution transmission electron microscopy (HREM) observations and atomistic simulations show that the core relaxation of this defect is dramatically affected by reversing the sign of the Burgers vector, as oriented…
A new coordination complex, [Zn(MCZ)3](NO3)2·H2O, was synthesized by the reaction of the aqueous solutions of zinc(II) nitrate and methyl carbazate. The complex was characterized by IR spectroscopy, elemental analysis and X-ray diffraction. It crystallizes in the monoclinic space group P2(1)/n. The central metal ion h…
a - Si : H ∕ Si O 2 multilayers prepared by plasma-enhanced chemical-vapor deposition exhibit a luminescence band around 760nm, which is quenched after a dehydrogenation process. Subsequent hydrogen plasma annealing (HPA) treatments are carried out, and the luminescence is then recovered. The effects of HPA are invest…