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Rheological Study of the Interfacial Crosslinking Reaction in Reactive Polymer Blends
Two reactive methacrylic polymers were synthesized by copolymerization of isobutylmethacrylate with a small amount of either methacrylic acid or glycidyl methacrylate. In a molten blend, the condensation reaction between the acid and epoxy groups leads to crosslinking at the interface between the domains formed by the…
On-line or Process Viscometry – A Review
Process viscometry has many advantages in terms of saving time and gaining more immediate information about a process. However, it can also has disadvantages in terms of compromises that must be made in taking a stream of liquid and passing it through a viscosity-measuring element. The latter operation can be a strong…
Academic Rheology and Industrial Rheology
This paper is an attempt to highlight the problems faced by industrial rheologists. The problems are far more complex than subjects of usual academic pursuit. Because of the lack of scientific methods in both theory and instruments, the industrial rheologist often resort to empirical approach such as a use of the proc…
Loss Tangent for Low Loss Thermoplastic Composites
Immobilisation/solidification of hazardous toxic waste in cement matrices
Immobilization and solidification of polluting waste, introduced into the industrial sector more than 20 years ago, and throughout last 10 years is being the object of a growing interest for engineers and environment scientists, has become a remarkable standardized process for treatment and management of toxic and haz…
The UV-VIS spectrophotometry applied to color and stability study in colored mortars
In the field of methodologies for color studying, a research of it has been done on colored mortars by applying uv-vis spectrophotometry, instrumental technique which can be used for solid materials works, and previously applied to building materials study. Results obtained show that the mentioned technique permits to…
RAPID EXTRACTION OF HIGH-QUALITY CHITOSAN FROM MYCELIA OF ABSIDIA GLAUCA
A rapid two-step extraction method for high quality fungal chitosan from Absidia glauca was developed. Fungal mycelia are autoclaved in a 1M caustic soda solution at 121C for 15 min. The alkali-insoluble-materials obtained are then further autoclaved for 15 min in a 2% aqueous acetic acid solution. There was a relativ…
High and Low Dielectric Constant Materials
Silicon-based dielectrics (SiO 2 , Si 3 N 4 , SiO x N y etc.) have been widely used as the key dielectrics in the manufacturing of silicon integrated circuits (ICs) and virtually all other semiconductor devices. Dielectrics having a value of dielectric constant k × 8.854 F/cm more than that of silicon nitride (k >…
Control of Wave Propagation in Periodic Composite Rods Using Shape Memory Inserts
Longitudinal wave propagation is controlled using shape memory inserts placed periodically along rods. The inserts act as sources of impedance mismatch with tunable characteristics. Such characteristics are attributed to the unique behavior of the shape memory alloy whereby the elastic modulus of the inserts can be va…
Puncture resistance and tensile strength of skin simulants
This study aims ultimately to quantify the force needed to penetrate human tissue. The results will reduce the subjectivity of expert opinion in stabbing incidents. They will also aid clinicians in assessing the severity of injury and help prevent the unnecessary deaths which can occur when this is not fully appreciat…
Electropolymerized Azines: Part II. In a Search of the Best Electrocatalyst of NADH Oxidation
A comparative investigation of catalytic activity of different polyazines in NADH electrooxidation is reported. The structure of azine monomers taken for electropolymerization was varied systematically changing both the second heteroatom and the substituents of aromatic rings. It was found that the monomer structure a…
Novel sorbitan monostearate organogels
Sorbitan monostearate, a hydrophobic nonionic surfactant, gels a number of organic solvents such as hexadecane, isopropyl myristate, and a range of vegetable oils. Gelation is achieved by dissolving/dispersing the organogelator in hot solvent to produce an organic solution/dispersion, which, on cooling sets to the gel…
Current dependence of grain boundary magnetoresistance in La_0.67Ca_0.33MnO_3 films
We prepared epitaxial ferromagnetic manganite films on bicrystal substrates by pulsed laser ablation. Their low- and high-field magnetoresistance (MR) was measured as a function of magnetic field, temperature and current. At low temperatures hysteretic changes in resistivity up to 70% due to switching of magnetic doma…
Effective Interaction between Star Polymers
(accepted for publication in Macromolecules) The distance-resolved effective interaction between two star polymers in a good solvent is calculated by Molecular Dynamics computer simulations. The results are compared with a pair potential proposed recently by Likos et al. [Phys. Rev. Lett. 1998, 80, 4450] which is expo…
Wigner-crystal and bi-stripe models for the magnetic and crystallographic superstructures ofLa0.333Ca0.667MnO3
The crystallographic (charge-ordered) and magnetic superstructures of ${\mathrm{La}}_{0.333}{\mathrm{Ca}}_{0.667}{\mathrm{MnO}}_{3}$ were studied by high-resolution synchrotron x-ray and neutron powder diffraction. In the antiferromagnetic structure, which was refined using a noncollinear model, the a lattice paramete…
Spin-polarized tunneling in the half-metallic ferromagnetsLa0.7−xHoxSr0.3MnO3(x=0and 0.15): Experiment and theory
The magnetoresistance (MR) in polycrystalline colossal magnetoresistive compounds follows a behavior different from single crystals below the ferromagnetic transition temperature. This difference is usually attributed to spin-polarized tunneling at the grain boundaries of the polycrystalline sample. Here we derive a t…
Cation distribution and crystal chemistry of Y3Al5−x Ga x O12 (0 ≤ x ≤ 5) garnet solid solutions
Five single crystals of Y(3)Al(5-x)Ga(x)O(12) (0 </= x </= 5) garnet solid solutions with the compositions x = 0.0, 1.0, 2.0, 3.0 and 4.0 were synthesized using a flux method. The compositional dependence of the lattice constants of the garnet solid solutions shows a large deviation from Vegard's law. Investigation of…
Redox-Controlled Size-Selective Fabrication of Nanostructured Transition Metal Colloids
Nanostructured transition metal clusters and colloids have various potential applications, their properties depending on the particle size, which ranges from 1 to 10 nm. Here is described a new way to prepare transition metal colloids size-selectively by simply varying the redox properties of a particular class of red…
High‐Temperature Oxidation of Boron Nitride: II, Boron Nitride Layers in Composites
The oxidation of BN composite interphases was examined with a series of model materials. Oxidation was examined in both low‐water‐vapor (∼20 ppm H 2 O/O 2 ) environments at 900°C and high‐water‐vapor (1% and 10% H 2 O/O 2 ) environments at 700° and 800°C. The low‐water‐vapor case was explored with layered BN/SiC mater…