Materials Literature
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Abstract Systematic changes of drying conditions of poly(acrylic acid) were tested to study their effect on the glass transition of the material. The materials were synthesized in two different mediums of water and benzene, respectively. The glass transition temperatures of the samples were determined by thermal analy…
A novel process for the formation of microchannels in polycrystalline diamond thin film on a single‐crystal silicon substrate is developed using anisotropic chemical etching of silicon and selective deposition of diamond. The polycrystalline diamond thin films were grown by high‐pressure microwave plasma assisted chem…
Some questions are raised regarding the model described by Crichton et al. (see ibid. vol.24, p.335-342, 1989) in which the entire volume of the void is considered to be involved in the discharge process. The commenter questions how it can be explained that an increase in the applied voltage results in an increase in…
In order to understand the behaviour of Ti–24 at.% A1–11 at.% Nb alloys during high-temperature deformation it appears relevant to have some information on the microstructures produced by high-temperature anneals of heavily deformed materials. In this work these microstructures have been studied after heat treatments…
Abstract Vesignieite, Cu 3 Ba(VO 4 ) 2 (OH) 2 , crystallizes in space group C 2 / m with a ° = 1.0270(2), b ° =0.5911(1), c ° = 0.7711(2)nm and β =116.42(3)°. The intensity data were collected with the RIGAKU RASA‐IIS single‐crystal four‐circle diffractometer. The structure was determined by Patterson and Fourier meth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of the partially substituted (phenoxy)chlorocyclotriphosphazenes by phase-transfer catalysisY. W. Chen-Yang, S. J. Cheng, and B. D. TsaiCite this: Ind. Eng. Chem. Res. 1991, 30, 6, 1314–1319Publication Date (Print):June 1, 1991Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and properties of poly(B-vinylborazine) and poly(styrene-co-B-vinylborazine) copolymersKai Su, Edward E. Remsen, Helen M. Thompson, and Larry G. SneddonCite this: Macromolecules 1991, 24, 13, 3760–3766Publication Date (Print):June 1, 1991Publication History Publish…
Abstract Characteristic absorption of the anion radical of pyromellitimide around 715 nm was demonstrated to be particularly useful for studies on photoinduced electron transfer reactions. Charge recombination in pyromellitimide-linked porphyrin was greatly retarded in benzene due to the large energy gap and small reo…
Abstract A brief review of addition polymerization processes is presented with a summary of the key characteristics classified by kinetic mechanism (free‐radical, anionic, cationic, group transfer, or Ziegler–Natta), phase behavior, and reactor type. A practical approach to modelling in the industrial R & D enviro…
The characteristics of Positive Temperature Coefficient of Resistivity (PTCR) thermistors depend strongly on the atmosphere, especially oxygen, during the fabrication process. The PTCR jump decreases when the sample is heated in a reducing atmosphere, while it increases when the sample is heated in air. The behavior o…
Achievement of good formability in aluminium sheet requires control of the final texture. Earing in deep drawing is a common problem in aluminium sheet and can be minimised by careful texture control. In practice, this means the control of recrystallisation during thermomechanical processing as well as control of part…
Capacitor-grade polypropylene films were aged under multiple stresses (electrical, thermal, and radiation). The aging experiments were performed for both singular and simultaneous combined stresses. The polypropylene was exposed to combined neutron-gamma radiation with a total dose of 1.6*10/sup 6/ rad, electrical str…
Impurity levels in Cd-doped GaSe have been studied by using photoluminescence (PL) measurements. The PL spectra at 77 K are dominated by three new emission bands at 1.95, 1.75, and 1.62 eV. The PL intensity and the peak energy of the 1.95 and 1.62 eV emission bands are measured as a function of the temperature. It is…
We report formation of the Nd2Fe14B-type compounds Y2Fe14C and Ce2Fe14C via heat treatment of melt-spun ribbons. The existence of several R2Fe14C (R≡rare earth) phases has been documented in the literature, but the light R compounds are extremely difficult to prepare by conventional procedures. In particular, the yttr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic oxides: oxidation of (.eta.-C5Me5)2V with O2 to form [(.mu.-.eta.3-C5Me5O3)V(O)]2, [(.eta.-C5Me5)V]4(.mu.-O)6, and (.eta.-C5Me5)6V8O17Frank Bottomley, C. Philippe Magill, and Baiyi ZhaoCite this: Organometallics 1991, 10, 6, 1946–1954Publication Date (Print):J…
Abstract Static pressure usually increases the transition temperatures of polymers by decreasing their free volume. If the pressurizing medium is soluble in the polymer matrix, the opposing effect of increasing the free volume is possible. Those shifts of transition temperatures were monitored with a medium‐pressure D…
Abstract To identify the far-infrared (FIR) absorption bands related to K cations in micas, spectra of muscovite, phlogopite, and biotite were compared with the spectra of pyrophyllite and talc, which have no compensating cations, and to the spectra of micas in which K is substituted by mono- and divalent cations. Dic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of discrete polyenes and norbornene-polyene block copolymers using Mo(CH-t-Bu)(NAr)(O-t-Bu)2 as the initiatorL. Y. Park, R. R. Schrock, S. G. Stieglitz, and W. E. CroweCite this: Macromolecules 1991, 24, 12, 3489–3495Publication Date (Print):June 1, 1991Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and synthesis of thermally labile polymers for microelectronics: poly(vinyl tert-butyl carbonate sulfone)Ying Jiang and Jean M. J. FrechetCite this: Macromolecules 1991, 24, 12, 3528–3532Publication Date (Print):June 1, 1991Publication History Published online1 May 20…
Fourier transform infrared (FT-IR) emission spectroscopy has been used to study both molybdenum oxide and supported molybdenum oxide catalysts. An infrared emission cell was specially designed to treat the samples in vacuo or in various gases over a wide temperature range (25–700°C). The experimental conditions includ…