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。
Abstract The effect of dibenzylidene sorbitol (DBS) as a nucleating agent on the crystallization of poly(ethylene terephthalate) (PET) has been studied. It has been found that DBS, when incorporated into the polyester, at a 0.5–1.0 wt % level, significantly lowers the induction period and reduces the half‐time of crys…
Abstract The thermal and crystallization behavior of blends of glass fiber reinforced polyphenylene sulfide (PPS) with polyethylene terephthalate (PET) has been reported. The blends showed two overlapping melting peaks and two separate crystallization peaks. The heat of crystallization of PPS was found to decrease con…
Sandvik introduces ‘second generation’ Duplex stainless steel hollow bar. Sandvik Steel UK has announced the introduction of SAF 2205 stainless steel hollow bar for use in the manufacture of machined components. This new grade represents. Sandvik's ‘second generation’ of Duplex stainless steel — combining the properti…
Abstract Four soils (Umbric Dystrochrepts) formed in loess in eastern Southland, at altitudes of 195‐365 m and under a rainfall of 1000 mm to over 1400 mm, were mineralogically and chemically analysed to determine the soil variation in this area, and to establish whether mineralogical or chemical criteria could be use…
There are certain characteristics that a good magnet must have. Over the course of this century new classes of magnetic materials have been discovered which continue to improve on these key properties.
The structure of N-heterocyclic complex formed by benzotriazole on silver colloidal surface is determined with SERS technique. It is found that the adsorption on silver surface is through the triazole part of the molecule. A new chemical reaction in this system is found with the SERS technique.
Abstract The C and A emissions in KBr:Ag − are measured in detail between 11.2 and 300 K. At 11.2 K, excitation in the peak position of the C band exhibits the C emission but it hardly produces A emission. Changing the excitation position to the higher energy side of the C band peak, the A emission is produced a littl…
Abstract Polycarbonate specimens were irradiated with gamma irradiation doses ranging from 2–75 Mrad. Vickers hardness number (H v ) of these specimens has been calculated. It has been found that H v decreases with irradiation dose upto 50 Mrad and thereafter it suddenly increases at 75 Mrad. This variation of H v wit…
Abstract Under different experimental conditions, various liquid polyurethanes (PU) were synthesized from castor oil and isophorone diisocyanate varying NCO/OH ratio. These polyurethanes were then subsequently interpenetrated with n‐butyl acrylate (nBA) monomer and ethylene glycol di‐methacrylate as crosslinker by rad…
The piezooptic behaviour of CsLiSO4 corresponds to the phenomenological model of a pseudoproper ferroelastic transition in a wide temperature region of the paraelastic phase but is violated in the vicinity of the phase transition. Log-log analysis of spontaneous values of birefringence, optical indicatrix rotation and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the cobalt(II)-"capped" porphyrin, Co(C3-Cap).3CHCl3John W. Sparapany, Maxwell J. Crossley, Jack E. Baldwin, and James A. IbersCite this: J. Am. Chem. Soc. 1988, 110, 14, 4559–4564Publication Date (Print):July 1, 1988Publication History Published online1 May 200…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation C. Godet, B. Drevillon; Kinetic ellipsometry study of the hydrogen plasma etching of hydrogenated…
Abstract The semiconductive 2:1 charge-transfer complex between benzo[1,2-c:3,4-c′:5,6-c″]trithiophene and 2,2′-(2,3,5,6-tetrafluoro-2,5-cyclohexadiene-1,4-diylidene)bis[propanedinitrile], (BTT)2(TCNQF4), crystallizes in the monoclinic system, space group P21⁄c, with the following cell constants: a=8.893(2) Å, b=10.58…
The thermal conductivity of a composite formed by sand fillers embedded in a poly ethylene matrix is studied experimentally. Results show a region of low particle content, where the conductivity is predicted by Maxwell-Eucken equation. Only at very high par ticle content, the filler tends to form agglomerates and cond…
ZnAl{sub 2}O{sub 4} spinel was prepared by both the sol-gel method and by the solid-state reaction technique. Physical properties of the product obtained by the two methods are compared. Sol-gel-derived ZnAl{sub 2}O{sub 4} showed evidence of crystals at as low as 264{degree}C. Quantitative x-ray diffraction (XRD) meth…
Abstract The mechanism of the electropolymerization of thiophene derivatives has been investigated by varying the electrosynthesis conditions and the monomer structure. The results of these analyses led to the definition of optimized electrosynthesis conditions allowing the control of the electrical and electrochemica…
The purpose of this work was to determined the value of spontaneous polarization accurately and to obtain additional information about phase transitions in perovskite lead ferroniobate, in particular, about the effect on the electric characteristics of the ceramic. The measured values of the spontaneous polarization o…
Abstract The growth rates of two poly(1‐butene) with different molecular weights have been deduced from microscopic observations and the corresponding morphologies have been described. In both polymers two changes in the growth regime are observed and interpreted according to Hoffman's kinetic theory of polymer crysta…
The influence of the microscopic shape anisotropy of the micelles on the pitch of a cholesteric lyotropic liquid crystal is investigated by x-ray diffraction and optical techniques. The mixture studied is potassium laurate, decanol, water, and brucine sulfate. The relative molar concentration of the brucine sulfate is…
Abstract 2,3-Dipyridylnorbornadienes were prepared using the Diels–Alder reaction of the HBF4 salts of dipyridylacetylenes with cyclopentadiene. Their absorptions extend to 380 nm and are red-shifted in an acidic media. They underwent photocyclization to give quadricyclanes which reverted to norbornadienes upon heatin…