Materials Literature
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The vapor pressures for praseodymium trihalides, PrCl 3, PrBr 3, and PrI 3, were measured above solid and liquid phases by the torsion method. In the covered temperature ranges, their values can be expressed by the following equations: PrCl 3 (s), lg( p /kPa) = 12.45 ± 0.20 − (16540 ± 200) K/ T (from 963 to 1045 K); P…
Amorphous ethylene−styrene interpolymers (ESIs) provide an excellent model system for testing contemporary concepts of molecular dynamics. Moreover, the results can be extrapolated to the chain reptation dynamics of amorphous polyethylene at ambient temperature which cannot be assessed by direct experimental technique…
N-[(2-Benzothiazolyl)thio]- (1), N-[(2-benzoxazolyl)thio]- (2), and N-(2-pyrimidylthio)-2,4,6-trisubstituted-phenylaminyls (3) were generated by oxidation of the corresponding amines. Although 2 and 3 were not sufficiently persistent to be isolated, 1 was very persistent and could be isolated as radical crystals. The…
Lipase catalysis in nonaqueous media is recognized as a powerful tool in organic and more recently polymer synthesis. Even though none of the currently known polyhydroxyalkanoate (PHA) depolymerases have lipase activity, they do have a catalytic center that resembles that of lipases. Motivated by the above, the potent…
When small concentrations of A- b -B diblock copolymer are mixed with selective solvent or A homopolymer, they often form spherical micelles with cores comprised of the B blocks. Mean field theory predicts that the core radii scale primarily with the degree of polymerization of the B block as with α ≃ 2/3 or larger, a…
The production of molecular hydrogen in the radiolysis of isotactic polypropylene (PP), poly(methyl methacrylate) (PMMA), and polystyrene (PS) with protons and carbon ions has been investigated. Previous experimental data on the above polymers with γ-ray and helium ion irradiations have been combined with similar stud…
In this paper the synthesis and characterization of a hyperbranched poly(aryl ether oxazole) with terminal phenolic groups are described. An ABB‘ monomer containing a pair of phenolic groups and an aryl fluoride which is activated toward displacement by the attached oxazole ring was prepared. The nucleophilic substitu…
The tension at the air−water interface is fundamentally due to the excess standard chemical potential of water in the interfacial region. Thus, a reduction in surface tension as a result of adsorption of an amphiphilic molecule, that is, surface pressure, must a priori be viewed as a reduction in the standard chemical…
Porphyrins with fused isoquinoline and quinoline units have been prepared by the "3 + 1" methodology. 5-Nitroisoquinoline and 6-nitroquinoline condensed with ethyl isocyanoacetate in the presence of a phosphazene base to give isoquino- and quinopyrroles, respectively. Ester saponification and decarboxylation with KOH…
Chlorins bearing synthetic handles at specific sites about the perimeter of the macrocycle constitute valuable building blocks. We previously developed methodology for preparing meso-substituted chlorin building blocks and now present methodology for preparing several complementary beta-substituted chlorin building bl…
Novel self-assembled molecular capsules were constructed from two moles of pyridine-containing porphyrin derivatives and four moles of Pd(II) complexes utilizing a pyridine-Pd(II) interaction. The (1)H NMR spectral studies established that these self-assembled molecular capsules 5 and 6 have a highly symmetrical D(4)(…
Holographic surface relief gratings (SRGs) were fabricated on composite films assembled by electrostatic layer-by-layer (ELBL) deposition of a polyelectrolyte, poly(dimethyl diallylammonium chloride) (PDAC), and an azo dye, Congo Red (CR). Surface modulation and first-order diffraction efficiency of the SRG were found…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA New Method to Synthesize Unsymmetrical Dithiolene Metal Complexes of 1,3-Dithiole-2-thione-4,5-dithiolate for Third-Order Nonlinear Optical ApplicationsJie Dai, Guo-Qing Bian, Xin Wang, Qing-Feng Xu, Min-Yan Zhou, Megumu Munakata, Masahiko Maekawa, Ming-Hong Tong, Zh…
The precipitation kinetics of hydroxyapatite from calcium phosphate aggregates was investigated by the continuous-angle laser light- scattering technique in the systems CaCl 2 −H 3 PO 4 −H 2 O and KCl−CaCl 2 −H 3 PO 4 −H 2 O at 25 °C. The apparent molecular weights of aggregates increased with time, and precipitation…
Herein we report the synthesis of a molecule that self-organizes through hydrogen bonds into discrete tetrameric capsular species, encapsulating large polycyclic guest molecules. The unique folded structure of the assembled state is determined by correlation spectroscopy in conjunction with molecular modeling. Pendant…
The reaction of the four-coordinate picket fence iron(II) porphyrin complex [Fe(TpivPP)] with cryptand-solubilized KNO 2 yields the five-coordinate porphyrin species [Fe(TpivPP)(NO 2 )] - . The six-coordinate complexes, [Fe(TpivPP)(NO 2 )(PMS)] - and [Fe(TpivPP)(NO 2 )(Py)] -, are obtained when pentamethylene sulfide…
A detailed analysis of the Bragg as well as of the diffuse X-ray diffraction scattering of isotactic polypropylene (i-PP) fiber samples, suitably crystallized in the α form under different conditions, is reported. A limit-ordered (α 2 form) and a limit-disordered (α 1 form) model structure have been described to accou…
Experimental literature data on the chemically and thermally activated decomposition of sec -C 4 H 9 radical were analyzed by weak collision master equation modeling. A reaction model with very little flexibility in its properties was created on the basis of ab initio calculations and experimental kinetic and thermoch…
The wetting behavior of thin films of symmetric poly(styrene- b -methyl methacrylate) was investigated on self-assembled (SA) films of octadecyltrichlorosilane on Si/SiO x with varying grafting density. The different types of SA organic films were produced by changing the deposition times ( t ) in solution. Two types…
Films were prepared at neutral pH from deamidated gluten by casting with or without enzymatic treatment by transglutaminase in the presence of various concentrations of diamines added to the film-forming solution. Variation in the glycerol/deamidated gluten ratio from 0.2 to 0.5 had a major effect on the film mechanic…