Materials Literature
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Abstract To obtain poly(lactic acid) (PLA) complex fibers, spinning was performed by wet and dry methods from 5–10 g/dL chloroform solutions of poly(D‐lactic acid) (PDLA) and poly(L‐lactic), both with a viscosity‐average molecular weight of 3 × 10 5 . The dope was extruded from a monohole nozzle into coagulation baths…
Laser radiation (XeCl laser, 308-nanometer wavelength) focused into a cell containing Mo(CO)(6) vapor produced ultrafine particles in the extended waist of the laser beam. Negative ion mass spectrometry revealed molybdenum carbide cluster ions with a stoichiometry MonC4n (n = 1 to 4). The MonC4n(-) (n = 2 to 4) ions a…
The structural basis for the stability of N termini of helices has been analyzed by thermodynamic and crystallographic studies of three suitably engineered mutants of the barley chymotrypsin inhibitor 2 with Ser, Gly, or Ala at the N-cap position (residue 31). Each mutant has a well-organized shell of hydration of the…
The dense packing observed in protein interiors appears to be crucial for stabilizing the native structure--even subtle internal substitutions are usually destabilizing. Thus, steric complementarity of core residues is thought to be an important criterion for "inverse folding" predictive methods, which judge whether a…
We report direct measurements of force vs. separation between self-assembled proteins. These forces are observed between collagen triple helices in native and reconstituted fibers. They are a combination of a short-range repulsion, which varies exponentially over at least five decay lengths, and an inferred, longer-ra…
An investigation of low-frequency inelastic scattering (LOFIS) and pre-resonant Raman spectroscopy has revealed the role of the modifying cations, Ba 2+ , Zn 2+ and Pb 2+ on the bonding properties of the Eu-O bond in Ba(PO 3 ) 2 , Zn(PO 3 ) 2 , and Pb(PO 3 ) 2 glasses. Analysis of the results has shown that the electr…
Abstract The interaction of sulfur, ZnO, stearic acid, and the three sulfenamide accelerators N ‐cyclohexylbenzothiazole sulfenamide (CBS), 2‐(4‐morpholinothio) benzothiazole (MOR), and 2‐ t ‐butylaminobenzothiazole sulfenamide (TBBS) were investigated by differential scanning calorimetry in the absence of rubber. In…
Abstract The effects of corona‐discharge treatment (CDT) of commercial polyethylene (PE) Linear low‐density PE (LLDPE) were studied with special emphasis on the heat‐seal behavior of treated films. A range of treat levels, representative of those used in industry, was obtained by varying the applied power to a commerc…
Electron beams with an energy of 10 keV were employed for selectively poling only the lower part of a typical nonlinear optical guest/host polymer at a temperature of 90 °C. The resulting dipole orientation was examined by means of electro-optical measurements and thermally stimulated depolarization, while the nonunif…
Abstract The thermal decomposition of three sulfenamide accelerators N ‐cyclohexylbenzothiazole sulfenamide (CBS), 2‐(4‐morpholinothio) benzothiazole (MOR) and 2‐ t ‐butylaminobenzothiazole sulfenamide (TBBS) were investigated by differential scanning calorimetry. The sulfenamides decompose rapidly at 210–220°C, yield…
Abstract Series of polyurethaneurea elastomers were prepared from 4,4′‐diphenylmethane diisocyanate, poly(teuramethylene ether) glycol and poly(hexamethylene carbonate) glycol for mixed soft segments, and 1,4‐butanediol and isophoronediamine for mixed chain extenders. Characteristics of the copolymers related with com…
Abstract The characterization of short chain branching in polyethylene using transmission FTIR spectroscopy is investigated. Traditional methodologies, using the methyl deformation band for qualitative and quantitative analyses, have recognized shortcomings. The methyl and methylene rocking bands, which are more chara…
Abstract In this paper, the crystallization characteristics of polypropylene and low ethylene content polypropylene copolymers with and without nucleating agents were studied by differential scanning calorimetry (DSC) and polarized light microscopy (PLM). In order to determine the nonisothermal crystallization rate of…
Abstract Heat sealing of films, i. e., formation of a joint between two films by placing them fleetingly between heated platens, was experimentally investigated for a variety of semicrystalline polyolefins, especially various polyethlenes, to determine how sealing temperature affected seal strength measured at room te…
The rare-earth gallium oxide perovskites RGaO 3 (R=La,Pr,Nd) are promising substrates for epitaxy of high-T c superconductors. In this paper the crystal structures of orthorhombic and rhombohedral RGaO 3 have been studied by neutron diffraction, which allows precise localization of light atoms such as oxygen, which ar…
Abstract Relatively uniform polymeric microspheres, the coefficients of variation being close to 10%, were obtained by the BPO‐initiated suspension polymerization of styrenic monomers. Unlike the conventional stirred‐tank system, a particular microporous glass membrane (SPG) provided uniform monomer droplets continuou…
Addition of small quantities (10–20 μg/ml) of a lipid binding protein from wheat to degassed beer was shown to significantly reduce lipid induced destabilisation of beer foam. The protein was found to be very effective against addition of free fatty acids, phospholipid and triglycerides to beer prior to foaming. The m…
The process of developing materials for use in energy-conversion machines based upon fission or fusion reactors is critically dependent upon subjecting those materials to the thermal and neutronic environment that reproduces, as closely as possible, that expected in a power-producing reactor. Materials scientists make…
Reduction-dissolution kinetics and apparent activation energies (Ea) of reagent grade β-MnO2 (Fisher Scientific, Fair Lawn, NJ), β-MnO2 (Ward's Earth Science, Rochester, NY pyrolusite), and MnOOH (Ward's Earth Science, Rochester, NY manganite) were determined by continuous gasometric analysis employing an isothermal a…
In the present work, the characteristics of complete solid solution systems with respect to the change of cohesive energy and the nature of chemical bonds have been examined by the calculation of energy and Mulliken’s population of cluster models by the extended Hückel method.The results of the present work are as fol…