Materials Literature
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Abstract Polylactic acid (PLA) is a biodegradable aliphatic polyester that is suitable for use in many fields related to medical treatment. This article reviews the glass transition temperature (T g ), the biodegradable rate of PLA blended with collagen (Col), and its mechanical properties through tensile, bending and…
Ternary indium (III) pyrophosphates with three-dimensional frameworks of MInP 2 O 7 (M = Na, K, Rb, Cs) have been found, and the crystal structures have been first reported in this paper. The optical and bonding properties were investigated in terms of the absorption and emission spectra, as well as the calculated ban…
Abstract Blends of poly(propylene) (PP) and poly(ethylene terephthalate‐co‐isophthalate) (co‐PET) (95/5) with and without compatibilizing agent (maleic anhydride PP), as well as composites of these blends with glass beads (50 wt%) with and without silane coupling agent surface‐treatment, were prepared and studied on a…
The behavior of multiblock polymers with alternating stiff and flexible blocks is discussed. The copolymers are immersed in selective solvent such that the rods are likely to aggregate to gain energy. Upon aggregation micelles appear and contribute to surface energies. This process is counterbalanced by the loss (and…
Abstract Aqueous polyurethane dispersions derived from polycarbonatediols, isophorone diisocyanate, and carboxylic diols including dimethylol propionic acid and dimethylol butyric acid were prepared. The effect of dispersing procedure is investigated by FT IR, GPC, and the tensile film properties. The polyurethane dis…
Two new cis-eudesmane sesquiterpene glycosides, liriopeoside A (1) and ophiopogonoside A (2), were extracted and purified from tubers of Liriope muscari and Ophiopogon japonicus, respectively, along with three known compounds. Their structures were elucidated as 1beta,6beta-dihydroxy-cis-eudesm-3-ene-6-O-beta-D-glucop…
The use of photoelectron spectroscopy for the evaluation of the electrochemical potentials in intercalation phases is presented. An in situ prepared thin film electrochemical cell has been used to relate electrochemical quantities as the change of electrochemical potential with electronic properties measured in UHV, a…
Abstract The effect of a saline environment on illitization in volcanoclastic rocks is examined in deep boreholes in the East Slovak Basin. Based on X-ray diffraction analysis, it is concluded that illite-smectite (I–S) expandability is always less in the salt-bearing bentonites (SBB) than in the salt-free bentonites…
A covalently linked N-fused porphyrin dimer was synthesized by treatment of the monomer with Ag(OCOCF3). Subsequent reaction of this dimer with NaOMe led to a porphyrin dimer with two α,β-bound (“confused”) pyrrole rings (see scheme) which adopt the inverted conformation. The dimer exhibits aromaticity in spite of its…
Abstract A novel, fluorinated diamine monomer, 2,5‐bis(4‐amino‐2‐ trifluoromethylphenoxy)‐ tert ‐butylbenzene ( II ) was synthesized through the nucleophilic substitution reaction of tert ‐butylhydroquinone ( t ‐BHQ) and 2‐chloro‐5‐nitrobenzotrifluoride in the presence of potassium carbonate to yield the intermediate…
Abstract The molecular chain heterogeneity of commercial linear low‐density polyethylene (LLDPE) was investigated by cross‐fractionation of temperature rising elution fractionation (TREF) and successive self‐nucleation/annealing (SSA) thermal fractionation by use of DSC. The results indicate that the linear relationsh…
Abstract A series of waterborne poly(urethane urea)s (WBPUs) containing various concentrations (8.3–15.5 mol %) of 2,2‐bis(hydroxylmethyl)propionic acid (DMPA) were prepared from isophorone diisocyanate, poly(tetramethylene adipate) glycol, DMPA, ethylenediamine, and triethylamine. The length of the hard segment with…
Nanogürtel nach Maß: Metastabile einkristalline Vanadiumdioxid-Nanogürtel (siehe Bild) wurden durch Hydrothermalreduktion von gelöstem Ammoniummetavanadat mit Ameisensäure erhalten. Die Morphologie der Nanogürtel konnte über die Reaktionsparameter Temperatur, pH-Wert und Reaktionszeit eingestellt werden.
We report the synthesis, characterization, and spectroscopic properties of a family of trinuclear cyano-bridged mixed-valent compounds, trans-[Ru(II)L(4)[NCFe(III)(CN)(5)](2)](4-), trans-[Ru(II)L(4)[CNFe(III)(CN)(5)](2)](4-), and cis-[Ru(II)(bpy)(2)[NCFe(III)(CN)(5)](2)](4-) (L = pyridine, 4-tert-butylpyridine, and 4-…
Abstract A new method has been developed for quantifying smectite abundance by sorbing polyvinylpyrrolidone (PVP) on smectite particles dispersed in aqueous solution. The sorption density of PVP-55K on a wide range of smectites, illites and kaolinites is ∼0.99 mg/m 2 , which corresponds to ∼0.72 g of PVP-55K per gram…
The dynamics of poly(2-vinylpyridine) (P2VP) have been studied as a function of temperature (in the range from 123 to 453 K), pressure (0.1−270 MPa), and molecular weight (1.1 × 10 3 −3.0 × 10 4 g/mol), using dielectric spectroscopy (DS) within the frequency range from 10 -2 to 10 6 Hz. Structural methods (wide-angle…
We have used the recently developed gel trapping technique (GTT) to determine the three-phase contact angles of submicrometer silica particles partially coated with octadecyl groups. The particles were spread at air-water and decane-water surfaces, and the aqueous phase was subsequently gelled with a nonadsorbing poly…
Specific monomer sequences in aromatic copolyimides are recognized through their π-stacking and hydrogen-bonding interactions with a sterically and electronically complementary molecular tweezer. These interactions enable the tweezer molecule to “read” monomer sequences comprising up to 27 aromatic rings by multiple a…
The variation of the activation enthalpy for surface oxygen exchange O2+⇄+2 h. with sample composition in (Ln,Sr)(Mn,Fe,Co)O3−z perovskites is rigidly coupled to the variation of the overall reaction enthalpy (see picture). This is the first mechanistically well-established example of a Hammett-like relationship for i…
Abstract A clay-rich Callovo-Oxfordian sedimentary formation was selected in the eastern Paris Basin (MHM site) to host an underground laboratory dedicated to the assessment of nuclear waste-disposal feasibility in deep geological formations. As described initially, this formation shows a mineralogical transition from…