Materials Literature
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Abstract Well‐defined low‐molecular‐weight polystyrene was grafted onto cellulose acetate in a homogeneous solution. The grafting was performed by esterifying the free hydroxyls in the cellulose acetate (acetyl DS 2.5) with anionically prepared polystyrene having a carboxylic acid group at one end of the chain. The ca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotovoltage and stability of an n-type silicon semiconductor coated with metal or metal-free phthalocyanine thin films in aqueous redox solutionsYoshihiro Nakato, Mitsuaki Shioji, and Hiroshi TsubomuraCite this: J. Phys. Chem. 1981, 85, 12, 1670–1672Publication Date (Print)…
Recent investigations have shown that the environment of dc lines is more damaging to insulation than that of comparable ac lines. Various mechanisms which can lead to failure of ceramic or composite insulators have been investigated. Results are reported for ceramic insulators on thermal breakdown and ionic migration…
Synopsis Benzylidene camphor derivatives have been currently used as ultraviolet filters in sunscreen compositions. When solutions of these compounds are exposed to the light from a solar simulator, a photoinduced cis-trans isomerization is observed. The initial quantum yields of this photochemical isomerization of st…
Abstract TiO2 showed a pronounced activity in the adsorption of basic α-amino acids, such as l-lysine and l-arginine, in an aqueous solution. The adsorptive activity of TiO2 containing sulfate ions was lower than that of the sulfate ion-free TiO2, and it was suppressed by phosphate ions. The pH of the aqueous solution…
Abstract Viscoelastic parameters for poly(ethylene terephthalate) (PET) fibers heat set under different conditions were determined at 110 Hz between room temperature and about 200°C. The correlation of dynamic mechanical properties with structure and their dependence on the temperature of the measurement are discussed…
The UV absorption spectrum of gaseous MBBA was observed at 110°C. The electronic structures of BA and MBBA were calculated as a function of the twist angle of aniline ring out of the C=N-C plane by means of the CNDO/S + CI method. The twist angle in MBBA was estimated as 52.0° in nematic, 66.3° in metastable solid, an…
Tetramethylammonium tetrabromocuprate [N(CH 3 ) 4 ] 2 CuBr 4 crystal has been found to undergo successive phase transitions at -32°C and at -36°C on cooling, and to show ferroelectric activity along the pseudo-hexagonal c H axis in the intermediate phase.
Abstract Die ternären Carbonate NaLn(CO 3 ) 2 mit Ln = La bis Lu sowie Y werden unter CO 2 ‐Drücken von 3 000 bar bei 350–500°C durch Umsetzung von Na 2 CO 3 mit Ln 2 (C 2 O 4 ) 3 · xH 2 O oder durch Entwässerung von NaLn(CO 3 ) 2 · xH 2 O dargestellt. Es werden zwei Strukturtypen beobachtet, die durch IR‐ und Röntgen…
Abstract A high speed puncture impact apparatus was used to measure impact loss in thermally aged ABS (acrylonitrilebutadiene‐styrene) as a function of time and temperature. Impact energy values decreased to a low level and degraded surface layer thickness increased as a function of aging time at three aging temperatu…
The redistribution of the boron impurity in sintered α‐SiC during thermal oxidation was investigated over the temperature range 1200· to 1400,°C using sputter‐induced photon spectrometry (SIPS). The process was modeled with the Stanford University Processing Engineering Models Program (SUPREM) which permitted the esti…
For four low alloy steels with a wide range of tensile strengths, the dynamical processes of the nucleation and propagation of stress corrosion cracking (SCC) in water with various polarization conditions and in a inhibitor solution were traced with an optical microscope. The results show that if the tensile strength…
Electroded films of polyvinyl fluoride (PVF) were polarized with DC electric fields as high as 315 MV m−1 for periods between 60 and 7200 seconds at room temperature. Thermal pulse data to determine the depth of polarization and pyroelectric coefficients were obtained on all samples. Large pyroelectric coefficients co…
The ESR of CrO3−4 has been studied at 4.2 K in single crystal YPO4 and YVO4. The g values and 53Cr hyperfine constants are g∥ = 1.9772, g⊥ = 1.9525, A∥ = 8.5×10−4 cm−1, A⊥ = 19.6×10−4 cm−1 for YPO4 and g∥ = 1.9773, g⊥ = 1.9511, A∥ = 8.6×10−4 cm−1, A⊥ = 18.7×10−4 cm−1 for YVO4. The resonances show an isotropic superhyp…
A discrete lattice model is used to investigate the interaction of vacancies with a dislocation in the BCC metal, molybdenum. A new interatomic potential to represent molybdenum has been produced. The formation energies and formation volumes for the vacancy and six interstitial configurations are investigated and the…
We report volume changes induced by the electrochromic process in sputtered iridium oxide films (SIROF's). We show that SIROF's expand on incorporation of water. The rate of water uptake is greatly increased by initial potential cycling, i.e. , coloring and bleaching. Hydration increases the kinetics of electrochromis…
Residual contact stresses about indentation flaws are demonstrated to have a strong deleterious effect on specimen lifetime in static fatigue. The underlying basis of conventional fatigue analysis is first examined critically and is argued to be deficient in the way the stress intensity factor for the flaws is related…
Abstract The stress‐strain characteristics of poly(ethylene terephthalate) fibers, heat set under different conditions have been studied under tension, and mechanical properties such as tenacity, yield point, elongation at break, and work of rupture are presented and discussed. An attempt has been made to correlate th…
A quantitative picture of the geometric and energetic trap structure of positively corona charged polyfluoroethylenepropylene (Telfon FEP-A) was obtained by a combination of isothermal and thermally stimulated current measurements in ’’open circuit.’’In addition the heat-pulse method was used to determine the mean dep…
Fatigue-crack propagation rates (d a /d N ) and fatiguecrack ‘thresholds’ ∆Kth have been studied in copper alloys (Cu-2Al, Cu-4Al, and Cu-8Al) of various grain sizes. Propagation rates are slower in fine-grained material and ∆Kth appears to vary in a linear manner with (grain diameter)−1/2, in much the same manner as…