Materials Literature
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The morphology and mechanical and viscoelastic properties of a series of blends of natural rubber (NR) and styrene butadiene rubber (SBR) latex blends were studied in the uncrosslinked and crosslinked state. The morphology of the NR/SBR blends was analyzed using a scanning electron microscope. The morphology of the bl…
Crosslink is the most important chemistry in a rubber vulcanizate. Degree and type of crosslinks of the vulcanizate determine its physical properties. Change of crosslink density and deformation of a rubber vulcanizate by thermal aging were studied using natural rubber (NR) vulcanizates with various cure systems (conv…
A mineral sepiolite (magnesium silicate with microfibrilar morphology) was calcined at 325°C and its behavior as filler for ethylene-propylene (EPM) compounds designed for electrical cable coating was studied. This calcined sepiolite is a material with good dielectric and physical properties and provides a reinforcing…
The evolution of structure and properties in uniaxially stretched polybutylene terephthalate (PBT) films has been explored. The stretch temperature has pronounced influences on the development of PBT polymorphism; the mechanisms of its formation involve levels of both applied stress as well as chain relaxation during…
Extracted from text ... The effect of dietary energy and protein level on the production of growing ostrichesT.S. Brand 1 , C.J. Nell 2 and S.J. van Schalkwyk 21 Elsenburg Agricultural Centre, P Bag X1, Elsenburg, 7607, 2 Oudtshoorn Experimental Farm, PO Box 351, Oudtshoorn, 6620IntroductionThe Ostrich Industry reache…
Well-defined central functionalized asymmetric triblock copolymers (CFABC) were designed as a new type of polymer-brush surface modifier with a short central functionalized block that could form chemical bonds with a suitable substrate surface. A combination of sequential living anionic polymerization and polymer modi…
A series of copolyesters were prepared by a direct polycondensation of 3-(4-hydroxyphenyl) propionic acid and p-hydroxybenzoic acid (HBA), vanilic acid (VA), or syringic acid (SGA) of different composition in pyridine using diphenyl chlorophosphate and lithium bromide as condensing agents. The effects of methoxy subst…
The thermal behavior was investigated for the Zn complexes of carbohydrazide and semicarbazide with Sr(NO3)2 and 10% CuO as the oxidizing agent. In both complexes, there was little difference in the various combustion characteristics. The combustion reactivity was relatively low compared with the case of using other o…
Free-energy related properties for penetrant sorption (water, methane, argon, oxygen, nitrogen, ethane, propane, and carbon dioxide) in amorphous polyethylene have been evaluated by a test-particle-insertion method with the excluded volume map sampling (EVMS). Two model systems, one a long chain model composed of 4 li…
The degradation of cathodoluminescent brightness under prolonged electron beam excitation of phosphors has been identified as one of the outstanding critical issues for the flat-panel field emission industries. The ZnS : Cu,Al,Au phosphor powders have been subjected to electron beam bombardment of 2 keV with different…
The corrosion protection characteristics of an epoxy-polyamide coating were investigated by electrochemical impedance spectroscopy in immersion tests performed in a 3.0% NaCl solution. Carbon steel and galvanized steel substrates were employed. A porous film was produced on the metallic substrates, which allows for el…
Artificially designed gelatins comprising tandemly repeated 30-amino-acid peptide units derived from human alphaI collagen were successfully produced with a Bacillus brevis system. The DNA encoding the peptide unit was synthesized by taking into consideration the codon usage of the host cells, but no clones having a t…
Citronellal was converted into isopulegol epoxide in a one-pot two-step reaction achieving a 68% global yield on Ti-MCM-41 and designing a two-solvent catalytic system.
La0.9Sr0.1Ga0.8Mg0.2O3 − x (LSGM) has been prepared by a complexing sol–gel process and characterised by X-ray diffraction, thermogravimetric-differential thermal analysis (TG-DTA) and conventional weight analysis. The room-temperature structure is orthorhombic, space group Pnma, with a = 5.5340(14), b = 5.5074(22), c…
With the development of squeeze casting, thixocasting and vacuum pressure die casting it became possible in the last five years to apply light metal pressure castings for safety critical areas of modern vehicles even in large volume production [1-10]. The newly developed casting processes allow the production of near…
Hybrid organic‐inorganic particles combine the best properties of silica — high efficiency and excellent mechanical strength — with the best properties of organic polymers — a wide pH stability range and reduced silanol effects. In this article, the authors describe reversed-phase HPLC packings based on hybrid particl…
Reaction of the verdazyl precursor 1,4,5,6-tetrahydro-2,4-dimethyl-6-(2′-pyridyl)-1,2,4,5-tetrazin-3(2H)-one (pvdH3) with oxygen and copper(I) bromide in acetonitrile results in precipitation of the crystalline diradical di-μ-bromo-bis[(1,5-dimethyl-6-oxo-3-(2-pyridyl)verdazyl)copper(I)]. The solid shows a slightly an…
The aim of the present work is to focus on the characterization of materials in situ by using a modified near‐field scanning optical microscope (NSOM) with a home‐built tuning fork head that allowed us to obtain optical imaging concurrently with topography of some systems. The first example is related to finding precu…
This paper compares a dibromo and a structurally strictly related diiodo monomer in regard to the respective achievable molecular weights and the degree of incorporated phosphorus when subjected to the Suzuki polycondensation. The diiodo monomer gives – by a factor of roughly two – a higher molecular weight PPP (Pn up…
The evaluation of the ampacity of electric power cables and the overload protection are currently based on criteria, to which the operation of the circuits will have to satisfy each time like the first time, without self-memory of the way of life, without discounts or debts correspondent to the actual profile load, ce…