Materials Literature
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Using thermomechanical spectroscopy, the molecular-weight distribution and relaxation transitions have been investigated in commercial LDPE and grafted by itaconic acid (LDPE-g-IA). This grafting in the molten LDPE was done by reactive extrusion with varied content of reactants in the blend under alternating of a shea…
Molecular weight determination of 83% degree of deacetylation (DD) chitosan with non-Gaussian and broad molecular weight distribution by high-performance size exclusion chromatography (HPSEC) and by capillary viscometry were proposed. The relationships between weight average retention volumes (RVw) of HPSEC and intrin…
The chain extension reaction in poly(butylene terephthalate) (PBT) melt was studied in detail. A high-reactivity diepoxy, diglycidyl tetrahydrophthalate, was used as a chain extender that can react with the hydroxyl and carboxyl end groups of PBT at a very fast reaction rate and a relatively high temperature. A Haake…
Polymerization of ethylene in a CSTR using a combined metallocene catalyst system (combination of an open-face catalyst, such as Constrained Geometry Catalyst, and a conventional metallocene catalyst) was studied. Using the model developed by Soares and Hamielec, and expanded by Beigzadeh et al., a steady-state simula…
The thermal decomposition of polycarbonate (PC), PC containing resorcinol bis(diphenyl phosphate) (RDP), and PC—acrylonitrile–butadiene–styrene (PC–ABS) blend containing RDP was studied by thermogravimetry. Volatile and solid products of thermal decomposition were collected at different steps of thermal decomposition…
The tensile drawing behavior of quenched and annealed films of isotactic polypropylene is investigated as a function of draw temperature and strain rate. A strain-induced structural change from the smectic to the monoclinic form is observed for the quenched films. A kinetic interpretation is proposed for the phenomeno…
New nanocomposites are processed with a plasticized poly(vinyl chloride) matrix reinforced by cellulose whiskers whose characteristics are a high aspect ratio and a large interface area. Dynamic mechanical analysis performed on samples reinforced with a filler fraction of up to 12.4 vol % gives the viscoelastic proper…
Experimental solubilities are reported for anthracene dissolved in ternary 2-butoxyethanol + 1-propanol + 1-butanol, 2-butoxyethanol + 1-propanol + 2-butanol, 2-butoxyethanol + 2-propanol + 1-butanol, and 2-butoxyethanol + 2-propanol + 2-butanol solvent mixtures at 25 °C and atmospheric pressure. For each of the four…
A series of codoped nanocrystalline ceria compositions, Ce 1 - x M x Bi 0.4 O 2.6 - x (M = Ca, Sr, and Ba; x = 0.01−0.15) were hydrothermally synthesized at 240 °C and characterized by powder X-ray diffraction, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. All as-made Ce 1 - x M x Bi 0.4…
Two novel, isostructural, one-dimensional tellurites of molybdenum(VI), (NH 4 ) 4 Mo 6 TeO 22 ·2H 2 O and Rb 4 Mo 6 TeO 22 ·2H 2 O, have been synthesized by hydrothermal method. They contain linear (Mo 6 TeO 22 ) 4 - anionic chains, parallel to one another and held together by NH 4 + /Rb + ions. “Mo 6 O 22 ” moieties,…
In this paper, the nonlinear dynamics of a new Shape Memory Alloy (SMA) actuator that possesses impressive payload lifting capabilities are presented. This actuator consists of 48 SMA wires mechanically bundled in parallel forming one powerful muscle. It was designed to lift up to 45.4 kg (100 lbs), which is approxima…
Complex formation between small carboxyl-terminated dendritic polymers and oppositely charged poly(dimethyldiallylammonium chloride) was monitored by turbidimetry, dynamic light scattering, viscometry and potentiometric titration. All techniques reveal a discontinuity at a well-defined pH, corresponding to the point o…
We have used neutron reflection to study the effects of pH and added electrolyte on the structure of a weak polyelectrolyte brush anchored by means of a hydrophobic block to a hydrophobic surface. The copolymer was poly(2-(dimethylamino)ethyl methacrylate- block -methyl methacrylate) (poly(DMAEMA- b -MMA)) containing…
The oxidation of various para-substituted phenyl methyl sulfoxides with several substituted oxo(salen)manganese(V) complexes follows an overall second-order kinetics that is first-order in sulfoxide and in oxo(salen)manganese(V) complex. Electron-releasing substituents in sulfoxides and electron-withdrawing substituen…
Orange-red crystals of [Pt(CN)2(bpy)] (bpy = 2,2‘-bipyridine) and [Pt(CN)2(i-biq)] (i-biq = 3,3‘-biisoquinoline) show completely different temperature-dependence of emission behavior which has been explained in terms of the characteristic change of each crystal structure based on the platinum−platinum and ligand π−π i…
Using a tridentate bis-amide ligand 2,6-bis[ N -(phenyl)carbamoyl]pyridine (H 2 L), in its deprotonated form, nickel complexes in three consecutive oxidation states [Et 4 N] 2 [Ni II L 2 ]·H 2 O ( 1 ), [Et 4 N][Ni III L 2 ]·H 2 O ( 2 ), and [Ni IV L 2 ]·0.75H 2 O ( 3 ) have been prepared, and 1 and 3 structurally char…
Hybrid SiO 2 −B 2 O 3 gels have been synthesized from cohydrolysis of modified silicon alkoxides (R−Si(OE) 3 R = Me, Vi, Et) and triethylborate, B(OEt) 3 . The structure of these gels was investigated by Fourier-transformed infrared (FT-IR) spectroscopy, 29 Si and 11 B solid-state nuclear magnetic resonance (NMR), X-r…
We present a theoretical study of the role of the local environment in the electronic properties of carbon nanotubes: isolated single- and multi-wall nanotubes, nanotube-ropes, tubes supported on gold and cutted to finite length. Interaction with the substrate or with other tubes does not alter the scanning-tunneling-…
We show that the current carrier density collapse in doped manganites, which results from bipolaron formation in the paramagnetic phase, leads to a colossal change of the optical conductivity in an external magnetic field at temperatures close to the ferromagnetic transition. As with the colossal magnetoresistance (CM…
In this paper we measure the optical extinction spectrum of a periodic array of silver nanoparticles fabricated by nanosphere lithography (NSL) and present detailed comparisons of the results with predictions of electrodynamic theory. The silver nanoparticles are small (∼100 nm) compared to the wavelength of light but…