Materials Literature
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Blood protein interaction with prosthetic surfaces seems to be the initial step in the chain of events leading to tissue incorporation of endovascular devices. This paper focuses on the relationship between surface free energy and protein adsorption on metals and polymers commonly used for fabricating vascular prosthe…
For matting of hair, multifactorial mechanisms are responsible. Thereby physical conditions, chemical agents and behavioural factors play the main roles. It seems evident that hair matting is not a hair disease; consequently, cutting off the affected hair and avoiding all possible trigger factors are the therapy of ch…
Aluminium–lithium alloys are widely used in the aircraft industry because of their low density and high elastic modulus. The Al–Li alloy 8090 has been well characterised from a mechanical viewpoint, but its corrosion mechanism has not been studied so completely. Recent work has focused on the use of electrochemical te…
The effect of accelerator combinations and antioxidants on UV radiation degradation of natural rubber (NR) latex thread with a conventional and efficient vulcanization system is presented. Zinc diethyl dithiocarbamate (ZDEC), zinc dibutyl dithiocarbamate (ZDBC), zinc mercaptobenzothiazole (ZMBT), and tetramethyl thiur…
The internal stress distribution of bagged fabric is studied theoretically and experimentally to investigate the influence of the stress distributions on fabric-residual-bagging deformation. A model is derived by using membrane theory to analyse the stress distributions for isotropic fabrics under different boundary c…
X-ray photoemission spectroscopy (XPS) has been used to investigate the growth process of K–Te thin layers with high quantum efficiency (QE) for photoemission in the UV range, prepared by sequential deposition of Te and K on a Mo substrate under ultrahigh vacuum conditions. Film formation occurs through different step…
The thermal and mechanical behaviour of a biotechnological polyester (poly(3-hydroxybutyrate-co-hydroxyvalerate) (PHBV) reinforced with wheat straw fibres has been investigated. In order to improve chemico-physical interactions between the components, the reinforcing agent has been previously submitted to a treatment…
The magnetic field dependence of the transverse magnetoresistance Δρ/ ρ0 and the Hall coefficient RH was measured for the graphite films of various thickness ranging from around 20 to 110 nm at temperatures between 4.2 K and 300 K. High quality of the crystallinity of these graphite films prepared by cleaving could be…
Reduction of the α-Keggin anion [Xn+O4W12O36][8 − n]− (X = H22+, B3+, Si4+) by six electrons results in the known tungsten “brown” species [Xn+O4(H2O)3WIV3WVI9O33][8 − n]− in which three W atoms have been reduced from WVI to WIV, forming a metal–metal bonded triad. The WIV atoms have terminal water coordinated in plac…
2,3-Dicarboxyaniline in its anionic state is oxidatively polymerized in aqueous solution by Na2S2O8 as an oxidant to yield oligo(2,3-dicarboxyaniline) as a novel oligoaniline. XPS analysis reveals that the structure of the resulting oligomer is 61% quinoid and 39% benzenoid with ca. 21% self-doping degree. The resulti…
A new model of solid-state polymerization of nylon-6,6 has been developed. The polymer crystalline fraction is assumed to consist of only repeat units, leaving end-groups and condensate in the amorphous fraction. Many effects neglected by previous models are considered, such as variable crystallinity, initial moisture…
In this work, melt-spun polypropylene (PP) fibers were treated in an electric field of a corona discharge. The fibers were then characterized using the thermally stimulated current (TSC) spectroscopy. It has been shown that the electret state of corona-treated PP fibers is a result of the combination of Maxwell–Wagner…
When ceramic matrix composites are subjected to fatigue loading levels sufficient to initiate microstructural damage to the constituents, the mechanical response of the laminate, e.g. the residual strength, stiffness and life of the composite, is governed by the physical state of the fiber/matrix interface. During loa…
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…