Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry and radiation chemistry of semiconductor colloids. 27. Preparation of colloidal lead dioxide and various electron-transfer processesAnil Kumar, Arnim Henglein, and Horst WellerCite this: J. Phys. Chem. 1989, 93, 6, 2262–2266Publication Date (Print):March 1, 19…
This report summarizes work conducted on the split-Hopkinson pressure bar (SHPB). The SHPB was modified to permit both tensile and compressive testing on cementitious materials. Direct tension tests were performed on concrete by cementing the specimen to the SHPB. Splitting cylinder tests were also conducted in the SH…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn oxygen-centered tetranuclear titanium compound Ti4O(S2)4Cl6F. Albert Cotton, Xuejun Feng, Piotr A. Kibala, and Robert B. W. SandorCite this: J. Am. Chem. Soc. 1989, 111, 6, 2148–2151Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Publis…
Abstract Block copolyetheramides were prepared by incorporating polyether into polyamide through melt polycondensation of polyetherdiamine, piperazine, dimer acid, and ε‐caprolactam. Bulk properties of block copolyetheramide, such as tensile strength, tensile modulus, elongation at break, hardness, and impact strength…
A highly sensitive and convenient Brewster angle method is reported for the accurate determination of the refractive index values for a biaxial crystal. The method is demonstrated for the near infrared through visible spectral ranges with the biaxial organic crystal MNA (2-methyl-4-nitroaniline) well known for its lar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.alpha.-Heteroatom-substituted nitrones. Synthesis and reactions of acyclic .alpha.-alkoxynitronesJames A. Warshaw, David E. Gallis, Bruce J. Acken, Orestes J. Gonzalez, and DeLanson R. CristCite this: J. Org. Chem. 1989, 54, 7, 1736–1743Publication Date (Print):March 1, 198…
Abstract There was some ambiguity on the reality of the formation of ether crosslinks in the ZnO crosslinking of CR. This report clearly indicates the absence of the ether crosslinks. The main reaction pathway of the ZnO crosslinking of CR is the addition of the carbonium ion formed from the isomerized 1,2 unit to the…
Abstract Sulfur containing polymers were synthesized by the addition of thiols to alkenes and alkynes. Although the polymer formation is explained on the basis of a radical intermediate these processes show typical characteristics of step growth polymerizations. These reactions have been applied for the syntheses of t…
Abstract In order to examine the “capto‐dative” substitution‐effect on the electrical conductivity, five compounds which have capto‐dative substituents were prepared. Electron withdrawing (capto) group was nitro‐ or cyano‐substituted phenyl and electron donating (dative) one was 5‐methyl‐5,10‐dihydrophenazinyl moiety.…
Abstract Differential scanning calorimetric (DSC) measurements can be used to infer the degree of fusion of rigid PVC articles. The preferred method involves annealing of the specimen at 260°C for 5 minutes, to erase all crystalline structures, followed by a 2 day storage at room temperature. New crystalline entities…
SUMMARY The formation of partially interlayered vermiculite (PIV) was studied in six Dystrochrepts derived from Tertiary sediments. Mineralogy of silt and clay fractions of gravel and fine earth separated from surface and subsurface samples were determined by X‐ray diffraction. PIV, mica, vermiculite and regularly int…
Abstract Phosphate rock (PR) has been used for decades as a P fertilizer for plants. Apatite is a basic P mineral that could have agronomic value as a source of Ca. Little information is available in literature on this possibility, however. A greenhouse experiment (6 wk) was conducted to compare the Ca value of six PR…
Potentiality of C. tropicalis and D. polymorphus, to produce surface active compounds (bioemulsifiers/biosurfactants) during shake cultivation on hexadecane and oily waste was studied. Better emulsification activity, specific towards aromatic hydrocarbons, was observed with C. tropicalis culture broth. Emulsification…
Abstract Bis(1,2‐diaryl‐1,2‐ethylenedithiolato)metal(0) complexes ( 1 ; metal = Ni, Pd, and Pt) react with quadricyclane (Q) to give selectively 1:1 adducts which are identical with the adducts between 1 and norbornadiene (NBD). In the adducts, two sulfur atoms of the different dithiolato ligands are added to one of t…
A method is described for the simultaneous determination of urinary HMMA, 5-HIAA and HVA by HPLC with electrochemical detection. The method was evaluated over an 8-month period and has thus far identified 2 cases of phaeochromocytoma, 1 case of neuroblastoma and 2 of carcinoid tumour.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of alkali-metal cations on silicon exchange and silicon-29 spin relaxation in alkaline silicate solutionsA. V. McCormick, A. T. Bell, and C. J. RadkeCite this: J. Phys. Chem. 1989, 93, 5, 1737–1741Publication Date (Print):March 1, 1989Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAzophenolic acerands: amine-selective coloration and crystal structure of a piperidinium saltexTakahiro Kaneda, Shinichi Umeda, Yuka Ishizaki, Hsien Saw Kuo, Soichi Misumi, Yasushi Kai, Nobuko Kanehisa, and Nobutami KasaiCite this: J. Am. Chem. Soc. 1989, 111, 5, 1881–1883Pu…
The thermomechanical processes that occur during thermal bonding of isotactic polypropylene are discussed. Each process is described and the magnitude of each effect estimated. The results suggest that flow is important to the formation of a good bond. Flow is facilitated by line pressure and is an important means of…
The thermal expansion of WC from 20 to 900 K was measured in the a and c axial directions using high‐resolution neutron powder diffraction. Third‐order polynomials have been calculated from the expansion curves. The results complement and are compared with prior data in the 293 to 900 K region.
In tetragonally distorted ferroelectric ceramics a regular domain pattern develops, which allows the grain to keep its shape according to its clamping condition. In coarse grained ceramic the adjustment of the shape is possible in three dimensions, in fine grained ceramic and in thin films a two dimensional adjustment…