Materials Literature
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Partially Carbamate Reaction of Cellulose with UreaThe reaction of cellulose with urea and substituted ureas has been studied by Segal' and Nuessle.2Some cellulose carbamate derivatives of aromatic amines3 were investigated to prepare in relation to facts that the treated cotton cellulose with urea a t 120°C in alkali…
Abstract The corrosion behaviour of orthopaedic metal implants was studied in an animal experiment in which 30 rabbits had stainless steel plates implanted after a varization osteotomy of the tibiae of their hind legs for one year. ESCA was used for the investigation of the surfaces of the inplants. The removed plates…
Abstract Strips of amorphous cellulose film were conditioned under wet atmospheres of 80 and 100% relative humidity or heated at 393 K in vacuo for different time intervals. The structural change of these samples was investigated using differential scanning calorimetry (DSC), IR spectrometry, x‐ray diffractometry (x‐r…
A low-swelling smectite was found in a recent marine mud of Ariake Bay. The Na-clay of this mud swells but to the same extent as the Ca-clay and its dominant interparticle force is not repulsion between individual particles. The sediment volume at low salt concentration and the specific viscosity of the Na-clay were a…
A few developments have been discussed that extend the range of the solid-state extrusion process for processing polymers and polymer morphologies that were difficult to process by conventional solid-state extrusion. The split billet and the push-pull extrusion techniques proceed at faster rates by comparison to the c…
High-resolution ac calorimetry measurements on the nematic-smectic-$A$ transition in liquid-crystal compounds, whose values of $\frac{{T}_{\mathrm{NA}}}{{T}_{\mathrm{NI}}}$ range from 0.94 to 0.99, indicate a crossover point at a value of $\frac{{T}_{\mathrm{NA}}}{{T}_{\mathrm{NI}}}$ equal to 0.96 between critical beh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome factors affecting the comfort assessment of knit T-shirtsJohn F. FuzekCite this: Ind. Eng. Chem. Prod. Res. Dev. 1981, 20, 2, 254–259Publication Date (Print):June 1, 1981Publication History Published online1 May 2002Published inissue 1 June 1981https://pubs.acs.org/doi/…
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…