Materials Literature
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Six porous copolymers of acrylonitrile (AN)/divinylbenzene (DVB) and methacrylonitrile (MAN)/DVB have been synthesized by the suspension polymerization in the presence of inert diluents. The resulting adsorbents are found to have slightly different specific surface areas (460–720 m2/g for AN/DVB and 560–730 m2/g for M…
The apparent density of bamboo (Bambusa phyllostachys) shoot was investigated at a moisture content range of 10–92% wet basis by weighing the product in air and determining the buoyancy force in toluene. An analysis of variance (ANOVA) unveiled that moisture content significantly affected apparent density at 95% confi…
The applicability of a mathematical model predicting iodine-129 profile in a silver nitrate silica-gel (hereinafter referred to as Ag-S) column for radioactive iodine treatment was examined using actual off-gas from a dissolution step of a spent nuclear fuel reprocessing test rig, where PWR spent fuels with burnups up…
Quaternization of poly(4-vinyl pyridine), (P4-VP) by common alkyl halides can be performed with relatively low (up to 65–70%) conversion yields. Here we describe fully quaternization of P(4-VP) with activated halides such as chloro 2-propanone and 2-chloroacetamide in dimethylformamide (DMF) at room temperature.
The radical copolymerization of limonene (optically active) with methyl methacrylate in xylene at 80±0.1°C for 1 hr, initiated by benzoyl peroxide (BPO) yield alternating copolymer(s), under the inert atmosphere of nitrogen, as evidenced by reactivity ratios r1 (MMA)=0.07 and r2 (limonene)=0.012 using the Kelen–Tüdos…
The particle morphology of impact polypropylene was examined experimentally in order to understand how the rubber phase produced in the second step of the polymerisation is distributed inside the growing polymer particles, and how the quantity of rubber produced influences the overall morphology of the final product.…
Improving the energy efficiency of clothes dryers has been the subject of numerous investigations. However, to date the clothes drying process has not been thoroughly tested or analyzed in a comprehensive study. Many of the techniques that have been proposed to improve energy efficiency add to dryer cost or are enviro…
Economic pressures on the refining industry are forcing many refiners to look at low price, high value crudes to improve margins. Some of these crudes are discounted because of perceived fouling or corrosion problems. A new strategy has been developed that allows refiners to choose crudes based on an estimate of their…
Adapting physico-chemical characterization techniques for in situ studies of real heterogeneous catalysts during conditioning, reaction, and deactivation processes is a research topic of growing importance. Up to now, in most studies only one single in situ technique is applied. However, new trends are focused on usin…
We present a systematic method for designing a perfect antireflection coating (ARC) for a semi-infinite one-dimensional (1D) photonic crystal (PC) with an arbitrary unit cell. We use Bloch wave expansion and time reversal symmetry, which leads exactly to analytic formulas of structural parameters for the ARC and renor…
Lattice vibrations of the wurtzite-type AlN have been studied by Raman spectroscopy under high pressure up to the structural phase transition at 20 GPa. We have shown that the widely debated bond-bending E_2^1 mode of w-AlN has an abnormal positive pressure shift up to the threshold of the phase transition, whereas in…
In this paper we construct such a set of `degenerate' Hamiltonians $\hat{H}$, which differ by an `intrinsic' constant but represent different physical systems yet possess the same ground state density. . Thus, although the proof of Hohenberg-Kohn (HK) theorem is independent of whether the constant $C$ is additive or i…
The effect of latex maturation on the physicochemica1 properties of radiation vulcanized natural rubber latex films was studied. The properties were compared to those of the nonirradiated natural rubber latex films at the same condition. For this purpose, field and concentrated latices were used. Tensile strength, mod…
The dehydration kinetics of dl- and l-aspartic acid, either in the absence or presence of phosphoric acid, from 323 to 573K were studied with thermogravimetric analysis (TGA), and the polymerization of dl-aspartic acid was studied by a thin-layer polymerization method. The results revealed that the dehydration of both…
Two polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) binary systems of different blend ratios were prepared in a twin screw extruder. The two ABS (PA-747 and PA-757) differed from each other largely by their flowability (as reflected by their different melt flow rates). Results of the selected mechanical propert…
The chemical and morphological surface properties of different unbleached and oxygen delignified softwood kraft pulp fibers were evaluated by using different ESCA and SEM techniques. The results of the different techniques have revealed that the surface of unbleached and oxygen delignified kraft pulp fibers has a high…
Spherical micelles of block copolymers may arrange into macrolattices in the bulk, in the blends with homopolymers, and in the solutions with low molecular weight solvents. In this study, we present the first experimental observation on the face-centered cubic (fcc) lattice of spherical micelles in diblock copolymer/h…
While high-throughput methods of protein production and crystallization are beginning to be well documented, owing to the output of large structural genomics programs, medium-throughput methods at the laboratory scale lag behind. In this paper, we report a possible way for an academic laboratory to adapt high-throughp…
The liquid crystal state or the mesophase of a substance occurs on the phase diagram between the crystal and the liquid phase. The liquid crystal state is also known as the mesomorphic state, and i...
Owing to the great versatility offered by polyurethanes regarding the ease of synthesis and variable properties of the final product obtained (elastomeric or rigid polymer), polyurethanes become a basic component used in IPN formation. Numerous studies were conducted on IPNs based on polyurethanes and various vinyl mo…