Materials Literature
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Boron films of 0.1–1.5 μm thickness have been prepared on sapphire, silicon, and tantalum as substrates by the pyrolysis of decaborane in the molecular flow region (≦10 −4 torr) and in a temperature range of 350°–1200°C. It is found that the deposition rate of the boron films is proportional to the decaborane partial…
A method for analyzing a magnetic damper (eddy current brake) consisting of a cylindrical magnet and a plate conductor of arbitrary shape is considered. Since the magnetic flux is a function of the position, the analytical solution to obtain the eddy current, braking force, and damping coefficient is obtained by divid…
Abstract Photocrosslinkable poly(2‐vinyloxyethyl cinnamate)'s with substituents in para position of cinnamoyl moieties were prepared cationically. Polymerizability of the monomers was markedly governed by the substituent and the glass transition temperatures of the polymers varied in the range of about 0 to 72°C. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular stereochemistry of low-spin five-coordinate phenyl(meso-tetraphenylporphyrinato)iron(III)Pascal DoppeltCite this: Inorg. Chem. 1984, 23, 24, 4009–4011Publication Date (Print):November 1, 1984Publication History Published online1 May 2002Published inissue 1 November…
A sintered apatite with enhanced strength was achieved by incorporating C a O‐P 2 O 5 /metal oxide frit. When B a O or Al 2 0 3 were partially substituted for C a O in the frit composition, the sintered product was stronger because grain growth was retarded. The average bending strength of the strongest sintered apati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent lanthanoid synthesis in liquid ammonia. I. The synthesis and x-ray crystal structure of (C5Me5)2Yb(NH3)(THF)Andrea L. Wayda, James L. Dye, and Robin D. RogersCite this: Organometallics 1984, 3, 11, 1605–1610Publication Date (Print):November 1, 1984Publication Histor…
Abstract A study using hot‐stage microscopy and differential scanning calorimetry in assessing the ability of a number of substrates to nucleate transcrystalline growth in polypropylene is reported. Surface energy, chemical composition, crystal morphology, and moisture content of the substrate are discounted as being…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of polyester-polyether block copolymer with controlled chain length from β-lactone and epoxide by aluminum porphyrin catalystTomokazu Yasuda, Takuzo Aida, and Shohei InoueCite this: Macromolecules 1984, 17, 11, 2217–2222Publication Date (Print):November 1, 1984Publ…
Spin-lattice (T1) and spin–spin (T2) relaxation times of the deuterons in supercooled D2O at 225 MPa, measured at two frequencies: 55.54 and 39.14 MHz down to 188 K are reported. The results show that T1 and T2 become frequency dependent in supercooled liquid water under high hydrostatic pressure at temperatures below…
Abstract Four closely related polyesters, with aromatic ester triads and decamethylene spacers, were prepared and characterized for their thermotropic liquid crystalline properties. Two of the polymers, which were based on linear biphenols, formed stable nematic phases, whereas one of the two based on nonlinear biphen…
Alkaline hydrolysis has been used for about 30 years as a procedure for modifying the physical properties of polyester fabrics. Despite the length of time the reaction has been-known, its kinetics and mechanism are not well understood. Studies conducted in our laboratory indicate that the hydrolysis of polyester occur…
Single-crystal copper specimens of various orientations have been cleaned, oxidized and examined by reflection high-energy electron diffraction in a XJHV chamber and then transferred, under vacuum, to a transmission electron microscope where the shape and orientation of the individual oxide islands could be examined.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of free volume and physical aging in polymer glassesT. S. ChowCite this: Macromolecules 1984, 17, 11, 2336–2340Publication Date (Print):November 1, 1984Publication History Published online1 May 2002Published inissue 1 November 1984https://pubs.acs.org/doi/10.1021/ma…
Abstract Butyl rubber (polyisobutylene‐co‐isoprene) mixed with polyisobutylene was crosslinked to yield elastomeric macromolecular networks containing dissolved linear macromolecules. Adhesion of these materials to themselves (self‐adhesion) and to an inert substrate was investigated over a wide range of peel rates an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR of silk fibroin. 3. Assignment of carbonyl carbon resonances and their dependence on sequence and conformation in Bombyx mori silk fibroin using selective isotopic labelingTetsuo Asakura, Yasuo Watanabe, and Takuro ItohCite this: Macromolecules 1984, 17, 11, 2421–2426Pub…
A three‐component glass system (Mg–Al–Si) was nitrided by adding amorphous and crystalline Si 3 N 4 . Glasses with varying amounts of nitrogen were melted, and their mechanical properties were measured. Density, hardness, Young's elastic modulus, and fracture toughness increased with increasing nitrogen content.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTArtificial membranes from multiblock copolymers. 3. Preparation and characterization of charge-mosaic membranesYoshiyuki Miyaki, Hiroshi Nagamatsu, Minoru Iwata, Koji Ohkoshi, Kazunori Se, and Teruo FujimotoCite this: Macromolecules 1984, 17, 11, 2231–2236Publication Date (P…
Abstract Thirty‐five polymethacrylate/chlorinated polymer blends were investigated by differential scanning calorimetry. Poly(ethyl), poly( n ‐propyl), poly( n ‐butyl), and poly( n ‐amyl methacrylate)s were found to be miscible with poly(vinyl chloride) (PVC), chlorinated PVC, and Saran, but immiscible with a chlorina…
Since the first successful use of an autogenous vein graft for arterial reconstruction by Gluck in 1898 and the establishment of the scientific basis for the use of veins as arterial substitutes by Carrell and Guthrie in the early 1900s, reversed autogenous veins have been used extensively in arterial reconstructive o…
Tensile yield behavior of the blends of polypropylene (PP) and styrene–ethylene butylene–styrene block copolymer (SEBS) is studied in blend composition range 0–25 wt % SEBS. Three sets of samples, (i) solution-blended compression-molded (SBCM), (ii) melt-blended compression-molded (MBCM), and (iii) melt-blended inject…