Materials Literature
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The chemistry of non-peroxo polynuclear cobalt(III) ammines is reviewed with particular emphasis on Werner's major contributions. Modern work in this area has shown that Werner's conclusions regarding the structures of these compounds are substantially correct in spite of the relatively primitive techniques he had ava…
Abstract Results are presented of the structures obtained upon crystallization of polypropylene from dilute solutions in α ‐chloronaphthalene. It is shown that under proper conditions of concentration and crystallization, isotactic polypropylene can be caused to grow in the form of lath‐shaped single‐crystal lamellae.…
Abstract Es gelang, unter den Bedingungen des Abkühlungsverfahrens aus Schmelzlösungen von MgO in Natrium‐ bzw. in Bleimetaborat, Kristalle von Kotoit, Mg 3 [BO 3 ] 2 , zu erhalten. Die optimalen Versuchsbedingungen werden angegeben. Aus Schmelzlösungen von MgO in Calciummetaborat kristallisiert eine nicht identifizie…
酢酸マグネシウム4水和物の分解反応の示差熱分析図形は,試料充てん層の厚さにより著しい変動を示す。この事実から,示差熱分析を中心として,熱天秤,X線回折,化学分析などの方法により,空気中における酢酸マグネシウム4水和物の熱分解の過程を追跡した。4分子の結晶水の脱水は約60℃ から開始するが,脱水の過程に中間水和物の生成はなく,一段脱水である。160℃以下の温度で脱水した無水物は,X線的に無定形状態であるが,180～220℃の温度範囲で結晶化が起こり,α型無水物となる。無水物は180～280℃ の温度範囲で数%分解するが,大部分は280℃ まで熱的に安定である。無水物は約300℃ で酸化マグネシウムに分解するが,熱分解の過程に中間化合…
The weight volume of wood, WRV of pulp and certain physical properties of paper of some tropical and Japanese hardwoods were studied from the morphological point of view.Correlation between the ratio of lumen diameter and fiber diameter (l/D) was found to have close relationship to such properties as the weight volume…
Sendust Fe-Si-Al ternary alloys have high saturation flux density, low coercive force and high resistivity. Moreover, they are strong against wear, so efforts have been devoted to make use of these alloys as the video-tape-recorder head materials. These alloys are too hard and brittle to be made into thin sheets by ro…
The engineering thermodynamic cycles and thermal efficiencies of bimetallic and metallic hydride emf cell systems, which are thermally regenerated by separating the reactants by distillation, are discussed. Thermodynamic equations are presented for the ideal regeneration cycles and from the ideal cycles, thermal effic…
Recently it was shown that the C[dbnd]S group in fluorothiocarbonyl compounds readily undergoes addition polymerization. This review describes polymers obtainable from such compounds as CF2[dbnd]S, CF3CF[dbnd]S, ClCF2CF[dbnd]S, HCFClCF[dbnd]S, and hexafluorothioacetone. The polymerization of CF2[dbnd]S is readily brou…
In the paper a review is given of the properties of oil-impregnated lapped-plastic-tape dielectrics for use as insulation in extra-high-voltage underground cables. The following subjects are discussed: choice of combinable materials, impregnation technique, results of breakdown measurements as a function of various di…
Abstract A quantitative characterization of natural rubber, both as the raw polymer, and unaccelerated vulcanized samples containing different proportions of sulfur and ranging from soft to hard rubber, is reported. A value of 86% of the chains of natural rubber could be accounted for against 37% as reported by Harrie…
Several years ago, members of ASTM Committee B-3, Subcommittee X (now Committee G-1, Subcommittee VI) on Stress Corrosion determined a need for review of work on stress corrosion testing prior to development of standards and criteria for determining stress corrosion susceptibility and behavior of various alloys. The s…
The thermal degradation of polytetrafluoroethylene oxide has been examined by the isothermal and thermogravimetric methods in the temperature range 450 to 650°C. The main components of the volatile gas are trifluoro-acetyl fluoride, carbonyl fluoride, and tetrafluoroethylene. The thermogravimetric decompositions of po…
The breakaway phenomena of Zr and some Zr alloys during high temperature oxidation were studied from a structural point of view, by means of high temperature X-ray diffraction, thermal gravimetry, optical microscopy, and differential thermal analysis. The structural change in oxide scale at breakaway is in close relat…
Abstract Potentiometric titrations have been carried out on a sample of poly(acrylic acid) of very high molecular weight ( M w = 1.92 × 10 6 ). At polymer concentrations greater than about 1 × 10 −4 equiv./liter, this material behaves as a weaker acid, under given conditions, than when it is heat degraded, and also co…
Abstract Using dilatometric techniques, detailed investigations have been made of the crystallization and melting behavior of high molecular weight poly(tetramethylene oxide), low molecular weight poly(tetramethylene oxide) glycol, and a high molecular weight copolymer prepared by the chain extension of the glycol. Th…
The Raman spectrum of the complex InCl3,2Et3O just above the melting point indicates that both ether molecules are co-ordinated to indium and that the InCl3 unit is planar. Characteristic frequencies due to internal vibrations of the ligands are similar to previously observed frequencies in the complex of aluminium ch…
C. A. Parker and T. A. Joyce, Chem. Commun. (London), 1967, 744 DOI: 10.1039/C19670000744
種々の酸化セルロースの81.25%リン酸による均一加水分解速度を20,30および40℃ で測定し,加水分解速度に及ぼす変質基の影響を検討した。リンターセルロースを二酸化窒素で酸化して得たウロン酸基を含む酸化セルロースの加水分解速度はカルボキシル基量とは関係がなく一定で,木材セルロースとリンターセルロースの加水分解速度の相違はカルボキシル基量によるものではない。過ヨウ素酸塩で酸化したセルロースの加水分解速度は,アルデヒド基量の増加とともに増大し,これをさらに亜塩素酸塩で酸化したり,水素化ホウ素ナトリウムで還元したりすると,加水分解速度は低下するが,なお未処理試料のそれより大きい。以上の事実からウロン酸型のカルボキシル基はグルコシド結…
Abstract The crystal structure of isotactic poly(vinyl methyl ether) has been defined on the basis of x‐ray fiber spectra. Isotactic poly(vinyl methyl ether) crystallizes in a rhombohedral unit cell whose constants referred to hexagonal axes are: a = b = 16.25 ± 0.15 A., c = 6.50 ± 0.05 A. (chain axis) Z = 18, d calc…
The Jormation and the dissolution characteristics oj massive carbide in a bearing steel (I .O% C, 1. 5% Cr ) were studied with continuously cast blooms oj 260 171m' or oj 18U mm octagonal section. A conventionally cast ingot oj 350 171m' was also examined Jor comlJarison .