Materials Literature
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Abstract The physical structure of oriented polyoxymethylene (POM) drawn in two steps by press drawing and subsequent simultaneous biaxial drawing was studied. The degree of crystallinity, the orientation, and the tensile modulus depending on draw ratio were analyzed. By the press drawing method, the draw ratio reache…
Federnde Polymere: Die nanohelicale Struktur von Poly(L-lactid) (PLLA) in der Polystyrol(PS)-Matrix chiraler PS-PLLA-Blockcopolymere reagiert wie eine Feder auf verschiedene Stimuli: Die selbstorganisierten Nanohelices wandeln sich bei der Kristallisation oder unter Scherung in Zylinder um (siehe Bild). Derartige ther…
Abstract AG‐80 epoxy resin, namely tetraglycidyl diaminodiphenyl methane (TGDDM), was irradiated with electrons of 120 keV. The results show that the irradiation leads to four major damage effects on the surface layer of the AG‐80 resin, including the discharging, mass loss, degradation, and carbon enrichment. With in…
We develop the mean-field theory of a charge-density wave (CDW) state in a magnetic field and study the properties of this state below the transition temperature. We show that the CDW state with shifted wave vector in a high magnetic field (${\mathrm{CDW}}_{x}$ phase) has at least double harmonic modulation on most of…
Abstract The melting, nonisothermal crystallization behavior and morphology of blends of polypropylene (PP) with random ethylene–propylene copolymer (PP‐R) were studied by differential scanning calorimetry, polarized optical microscopy, scanning electron microscopy, and X‐ray diffraction. The results showed that PP an…
Abstract The combination of a polyaminoamide‐epichlorohydrin (PAE) resin (a paper wet strength agent) and stearic anhydride was recently reported as an effective compatibilizer system for wood‐polyethylene composites. Further investigation of this new compatibilizer system revealed that the pH value of a PAE solution,…
Addition of polyethylene glycol to aqueous assembly solutions of oppositely charged polypeptides enables high-capacity "loading" of functional protein in biocompatible microcapsules by template-supported layer-by-layer nanoassembly.
The mobility of charge along the σ-bonded backbone of tin atoms in poly(di-n-butylstannane) is ca. 0.1 cm2 V–1 s–1 in the crystalline phase. It decreases by only a factor of three in the liquid-crystalline mesophase, which is stable down to –25 °C on cooling from room temperature (see Figure). The high mobility and th…
Measurements of the specific heat and the static dielectric permittivity of heptyloxycyanobiphenyl (7OCB) confined to the 0.2 microm diameter parallel cylindrical pores of Anopore membranes in the isotropic phase and nematic mesophase, are presented. A comparison between the bulk and the confined 7OCB in treated and u…
Four kinds of hydroxy-ended azobenzene-type chromophores containing different substituent groups as electron donor or electron acceptor were synthesized and further reacted with 3-isocyanatopropyltriethoxysilane (ICTES) to give alkoxysilane dyes via a urethane reaction. Following a sol-gel process of the alkoxysilane…
Abstract A series of polymers based on methylmethacrylate, butylacrylate, and ω‐perfluorooctylalkylacrylate were prepared by radical polymerization. By changing both the length of the hydrocarbon spacer, between the fluorinated chain and the ester function of the fluorinated monomer, and its concentration, the surface…
A method of compression-molding fine-powder blends of polycaprolactone (PCL) and poly(ethylene oxide) (PEO) and subsequently dissolving the PEO phase was investigated to prepare porous PCL scaffolds. Different mixing ratios of the two polymers from 20 to 70% PCL were used to study the effect of the mixing ratio on the…
Abstract We report on the preparation and characterization of N‐doped ZnO powders. EPR measurements revealed the presence of N‐acceptors similar to those found in single crystals ( A iso = 1.225 mT, A aniso = 0.864 mT, g ‖ = 1.9953, g ⊥ = 1.9633). The photoluminescence of the samples shows donor to shallow acceptor re…
Abstract Surface modification of polyimide films such as Kapton E(N) and Upilex S by argon plasma was investigated because of the enhanced adhesive strength with sputtered copper. Peel tests demonstrated this improvement, with a peel strength of 0.7 and 1.2 g/mm for unmodified Kapton E(N) and Upilex S, respectively, a…
We present the first scanning tunneling microscopy (STM) study of the deposition of mass-selected silver clusters (Ag(n),n=1, 2, 3) on a rutile TiO(2)(110)-1x1 surface at room temperature under hard-landing conditions. Under hard-landing conditions, only small features are observed on the surface in all cases without…
Abstract Organic solvents cyclohexane, dichloromethane, hexane, and tetrahydrofuran were tested to separate the dioctylphthalate (DOP) as plasticizer from the poly(vinyl chloride) (PVC)‐based materials. It was found that the efficiency of ultrasound‐enhanced hexane extraction of the DOP from PVC is 70% and the efficie…
Abstract The prospects of synthesizing polycationic species using GaBr 3 in benzene solution at room temperature have been investigated. The salts Bi 8 [GaBr 4 ] 2 , Sb 8 [GaBr 4 ] 2 and Te 4 [Ga 2 Br 7 ] 2 have been isolated and characterized. The first two compounds are isotypic with Sb 8 [GaCl 4 ] 2 , crystallize i…
Order parameters derived from residual dipolar couplings between NH groups reveal motion of protein backbones on a time scale slower than the correlation time τC. Less-mobile amides (blue and green) in ubiquitin, for example, are H-bonded and belong to residues with side chains pointing towards the hydrophobic core wh…
Materials for photoelectrochemical devices Photosensitive materials Materials for solar cells Defect chemistry of ternary oxides Introduction to thermoelectricity The measurement of thermoelectricity Interface mass transport in oxide materials Surface properties of ionic conductors Fast ionic conductors Oxygen ionic c…
Abstract The synthesis and structural characterization of a novel class of mono‐lacunary Dawson polyoxometalate‐(POM‐)based, water‐soluble organometallic complexes, which are expected to be effective homogeneous oxidation catalyst precursors in water, is described. The organometallic complexes K 8 [{(C 6 H 6 )Ru(H 2 O…