Materials Literature
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To produce high-performance poly(ethylene terephthalate) (PET) composites from the polymerization of ethylene terephthalate cyclic oligomers (ETCs) prepared from PET waste, the viscosity, thermal stability, and crystallization of ETC melts were investigated, and ETC melt was polymerized with cyclic dibutyltin initiato…
As part of a wider effort to develop a new class of waterborne coatings, hybrid miniemulsion polymerization was carried out with acrylic monomers (methyl methacrylate, butyl acrylate, and acrylic acid) in the presence of oil-modified polyurethane resin. Latexes with different ratios of resin to acrylic monomers were s…
In this article, we report on the effect of using ultrasound during emulsion polymerization. This work differs somewhat from that previously reported in that ultrasound is used in conjunction with conventional initiators. The aim is to observe the changes in the nature of polymerization and the synthesized polymer. In…
Gelatin was chemically modified by crosslinking samples with one of a number of bifunctional reagents as was done earlier in a processing technique used to improve mechanical properties through chain orientation. The effects of this crosslinking on the biodegradability of the resulting films were evaluated in the labo…
The sorption and diffusion of water vapor in poly(ethylene terephthalate) (PET) film were measured by applying a thermogravimetric analyzer (TG-DTA), which customarily has been used to detect the weight loss of a sample with the increase of temperature under a given atmosphere. In this case, we detected the weight gai…
A resin with a high refractive index and a high Abbe number can be produced by radical polymerization of a polymerizable monomer mixture composed of essentially sulfur-containing aromatic methacrylates. An optical material composed of said resin is provided especially for lenses. © 2000 John Wiley & Sons, Inc. J Appl…
Coordination of para- substituted pyridines 4-X-C 5 H 4 N (where X = NMe 2, CMe 3, H, COMe, CN) to metal carbonyl moieties such as “ cis- M(CO) 2 Cl” (M = Rh(I), Ir(I)) and “ fac- Os(CO) 3 Cl 2 ” produces an enhancement up to about 2 orders of magnitude of the quadratic hyperpolarizability β λ of the free pyridine. Th…
Continuous, slow addition of AB 2 monomer (3,5-diiodophenylacetylene) to a solution of a multifunctional core results in high molecular weight hyperbranched phenylacetylene polymers with narrow polydispersites. Control over the molecular weight ( M w = 8−90 kDa) was achieved by varying the monomer:core ratio from 17.5…
[Fe(btzp)3](ClO4)2 (btzp = 1,2-bis(tetrazol-1-yl)propane) represents the first structurally characterized Fe(II) linear chain compound exhibiting thermal spin crossover. It shows a very gradual spin transition (T1/2 = 130 K) which has been followed by magnetic susceptibility measurements and 57Fe Mössbauer spectroscop…
The secondary crystallization and its influence on the glass transition are studied as a function of crystallization temperature and time by differential scanning calorimetry for PEEK. The multiple melting behavior resulting from isothermal annealing from the glass or crystallization from the melt is discussed in the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSoluble Polyimides from Unsymmetrical Diamine with Trifluoromethyl Pendent GroupIm Sik Chung and Sang Youl KimView Author Information Center for Advanced Functional Polymers, Department of Chemistry and School of Molecular Science (…
The magnetization curves as a response of sweeping magnetic field in the thermal environment are investigated using the quantum master equation. In a slow velocity region where the system almost behaves adiabatically, the magnetic plateau appears which has been observed in the recent experiment of V$_{15}$ [ Phys. Rev…
We describe a theoretical study of the role of adsorbate interactions in island nucleation and growth, using Ag/Pt(111) heteroepitaxy as an example. From density-functional theory, we obtain the substrate-mediated Ag adatom pair interaction and we find that, past the short range, a repulsive ring is formed about the a…
We calculate the electronic and optical excitations of polythiophene using the GW approximation for the electronic self-energy, and include excitonic effects by solving the electron-hole Bethe-Salpeter equation. Two different situations are studied: excitations on isolated chains and excitations on chains in crystalli…
ultiwalled carbon nanotubes, prepared by both electric arc discharge and chemical vapor deposition methods, show a strong visible light emission in photoluminescence experiments. All the samples employed in the experiments exhibit nearly same super-linear intensity dependence of the emission bands on the excitation in…
Several alumina-supported ceria samples with varying ceria contents (1, 2, 10, and 39 wt %) have been studied by different techniques (XRD, Raman, TEM-EDS, UV−vis DRS, XANES, and EPR), aiming to establish a complete model on the structural and redox characteristics of ceria entities in these samples. Two general types…
Recent advances in CVD diamond growth and processing technology allow this material to be used effectively in a number of high-power laser applications. New data will be presented on the optical properties at 10.6 micrometer relevant to the use of CVD diamond as optical elements in high-power CO<SUB>2</SUB>, lasers. I…
Abstract Foam propagation in co-injection was studied in a 10 m long porous medium, equipped with pressure ports for every 1 m. The porous medium had been characterized by flooding experiments on the core scale. In the absence of oil, propagation on the 10 m scale could be understood by corescale, steady-state foam pr…
The oxidative polymerisation of the complex2,3-dimethyl-N,N′-bis(salicylidene)butane-2,3-diaminatonickel(II), [Ni(saltMe)], was monitored by the electrochemical quartz microbalance (EQCM) and crystal impedance techniques. Polymerisation efficiency was maintained throughout deposition of a film, which behaved rigidly,…
p-type lead sulphide (PbS) thin films were chemically deposited onto Si3N4/n-Si substrates. A three-contact pseudo-metal–oxide–semiconductor structure was designed in order to investigate the possibility of enhancing the signal-to-noise ratio in the PbS film by field effect. It was proved that on the entire sensitivit…