Materials Literature
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Abstract Blends of isotactic polypropylene with amorphous and slightly crystalline ethylene‐propylene‐diene terpolymer (EPDM), prepared by solution blending, have been investigated by optical microscopy and differential scanning calorimetry. Nucleation and crystallization kinetic parameters, such as nucleation rates,…
Abstract New photochemically labile phosphate protecting group was developed. These phosphate esters have high molar extinction coefficient (ε340 = 34500 dm3 mol−1 cm−1) and rapidly release parent phosphates upon irradiation ( >300 nm) with high quantum efficiency for disappearance (φdis = 0.22 at 340 nm).
Ultrasonic cleaning is an established method for removing micron-size particles or larger from hard substrates. This paper presents the effect of the ultrasonic frequency and time functions on submicron particle removal effectiveness. The effect of the particle size, concentration and the cleaning liquid temperature i…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Detailed microscopy of two crept aluminas, one with (AD99) and one without (Lucalox) a grain boundary glassy phase, has been performed to determine the pertinent damage mechanisms during creep. Evidence is presented for a nucleation‐controlled cavitation process where creep cavities nucleate primarily on two‐grain fac…
The SMART® Wrist-Hand Orthosis (WHO) is a new method of providing grasping function for quadriplegic patients. The use of shape memory alloy (SMA) actuators in rehabilitation technology (SMART) allows for a new type of actuator in addition to traditional actuators such as Bowden cables, pneumatic cylinders, electric m…
The failure of warp yarns on a loom is often caused by repeated cyclical elongation at small stresses well below the breaking point applied under static load. The phenom enon, commonly known as fatigue, is caused by the gradually diminishing resistance of the material, attributable to cumulative damage. Generally, the…
The equiaxed solidification of eutectic alloys is modelled by a probablistic method. The volume of the specimen is divided into a regular network of cubic cells and the temperature is assumed to be uniform. The temperature of the specimen is calculated in a time-stepping scheme from a simple heat balance and a knowled…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-temperature kinetics of silicon atom oxidation by nitric oxide based on silicon, nitrogen, and oxygen atom measurementsH. J. Mick, H. Matsui, and P. RothCite this: J. Phys. Chem. 1993, 97, 26, 6839–6842Publication Date (Print):July 1, 1993Publication History Published o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and bonding of pentaaquanitrosylchromium(2+) sulfateMichael Ardon and Shmuel CohenCite this: Inorg. Chem. 1993, 32, 15, 3241–3243Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://pubs.acs.org/doi…
Abstract Blends of poly(aryl ether ketones) (PAEKs) and an amorphous poly(ether imide) (PEI) were used as model systems to study the broadening of the glass transition due to crystallization and the resulting depletion of PAEK from the amorphous phase. Two different PAEKs were studied, which are completely miscible wi…
Article The Sorption of 210Pb, 210Bi and 210Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides was published on July 1, 1993 in the journal Radiochimica Acta (volume 62, issue 1-2).
Abstract Polyamide samples were heated under vacuum or mixed in a Brabender plastograph. UV absorbance, chain end concentration, and molecular weight were studied. Postcondensation was observed for polyamide heated under vacuum. For polyamide samples mixed in the plastograph, atmosphere, shear rate, and temperature ch…
The previously reported correlations in indigo dyeing of cotton denim between distribution of indigo in the cross‐section of denim yarn, colour yield and dyebath pH are reviewed. Statistical analysis reveals that even with the experimental uncertainty of the absolute p K a values associated with the ionisation of the…
Abstract A salt of H3PW12O40, Cs2.5H0.5PW12O40, catalyzed efficiently the skeletal isomerization of n-butane to isobutane at 300 °C. The activity and selectivity were much higher than those of SO22−/ZrO2. H-ZSM-5 was more active than Cs2.5H0.5PW12O40, but the selectivity was very low.
Depolarized Rayleigh scattering (DRS) and dielectric spectroscopy (DS) are employed to study the solvent and polymer dynamics in the polystyrene (PS)/toluene system and for PS concentration up to 0.6 g/ml. The DRS measurements were made in the temperature range from 255 to 373 K with different interferometers making p…
The densification of Al 2 O 3 –30TiC (in weight percent) composite is investigated as a function of Y 2 O 3 additions. It is observed that very small amounts of Y 2 O 3 are effective in aiding the densification. The density was observed to pass through a maximum at 0.35 wt% of Y 2 O 3 . The gas‐generating reaction of…
In the past several years, "Shingosen," or new synthetic fibers have been developed in Japan. Polyester fibers and fabrics have attained a new status among other synthetic and natural fibers and textiles, and the Japanese have begun to recognize that recent polyester products are comparable to natural fibers such as s…
Abstract The radical grafting of C n F 2n +1 CH 2 CH 2 SH ( n = 6,8) onto the double bonds of hydroxyl‐terminated liquid polybutadienes (HTPBD) was studied. Various methods for investigating the amount of grafting (titration of residual thiol and fluorine analysis) were used and compared. The nature and the amount of…
The advantage of fast firing depends not only on the finer grain‐size effect at the sintering temperature, but also on the smaller pore‐size effect which results from the restricted pore growth. Pore growth due to the differential sintering during heating was observed to occur at relatively low temperature regions, an…