Materials Literature
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Preceramic polymer of Si-N(-C), perhydro-polysilazane (PHS), polyborosilazane (PBS) and methyl-hydropolysilazane (MHS), were synthesized by a pyridine-adduct method. The properties of polysilazanes were examined in relation to their potential application to the precursors of ceramic composites. PBS had too high viscos…
A mathematical model of a batch foam fractionation process has been developed based on analogies to a distillation model. The model is tested for the foam fractionation of the aqueous protein solution obtained from kudzu (Pueraria lobata) vine retting broth. This broth is most likely comprised of cellulases and pectin…
In this article, a series of O-2-[2-(2-methoxyethoxy)ethoxy]acetyl celluloses with different degree of substitution (DS) values was synthesized by a homogeneous reaction of cellulose with 2-[2-(2-methoxyethoxy)ethoxy]acetyl chloride in a 10% (w/w) dimethylacetamide/lithium chloride solution, combined with pyridine as…
Synthesis of nanometer-sized carbide powders using petroleum coke as carbon source during the mechanical alloying is explored. The synthesis procedure involves milling of petroleum coke powder with elemental Ti and Si powders, respectively. The measurement results of X-ray diffraction and BET indicated that cubic TiC…
The self-repairing reaction of polymer chains cleaved due to degradation was elucidated through the use of degradation poly phenylene-ether (PPE) related polymer composites. In the case where the cleavage of main chain partially occurred, a spontaneous re-bonding reaction proceeded at the chain ends with copper/amine…
Several interlaboratory tests according to ISO 5725 (1994) on polymeric materials using thermal analysis are presented. The results, especially repeatability and reproducibility data, are discussed. Thermogravimetric analysis (TGA) was used for the determination of carbon black, ash and plasticizer content in polymeri…
We outline a model to describe the rheology and the nonlinear response of layered materials. Explicitly, the focus is on cases wherein the system possesses internal states whose relative populations undergo a change upon the application of a stress. The objective of the model is to describe the mutual interplay betwee…
2-Dicyanomethylene-1,1,3,4,5,5-hexacyanopentene (DHCP) dianion, which had been reported as 2,3-bis(dicyanomethyl)-1,1,4,4-tetracyanobutadiene, was synthesized as a tetraalkylammonium salt from hexacyanobutadiene. The crystal structures of tetraalkylammonium (alkyl: methyl, ethyl), tetrathiafulvalene (TTF) and bisethyl…
This paper provides an overview of the current fiber world in terms of consumption of various fiber types worldwide. Further, it deals with the development of our modern concepts of fiber structure based on the original theories for natural cellulosic fibers. As an example of modern fiber science research, the paper c…
The formation of the microdroplets on fibres for the MDT test offers an opportunity to carry out surface tension measurements based on the angle of contact between the resin and the fibre. Liquid microdroplets of epoxy were deposited on glass fibres, and their diameter, length and cone angle were measured. The equilib…
Poly(imide-siloxane) containing α,ω-(aminophenoxypropyl)poly(dimethylsiloxane) and α,ω-(aminophenoxypropyl)poly(dimethylsiloxane-co-diphenylsiloxane) were synthesized. The adhesion strength of poly(imide-siloxane)/Alloy 42 leadframe (Fe-Ni alloy, 58% Fe and 42% Ni) joints was studied as a function of the molding tempe…
The paper presents results of the study of the dependence of longitudinal ultrasonic velocity and attenuation in ferroelectric-semiconductor single crystals of the Sn2P2(Se,S)6 family on temperature. A photostimulated shift of the phase transition to lower temperature has been detected. Oscillations of relaxing ultras…
In a pot experiment with five harvests of ryegrass the potassium (K) uptake from soil was studied in a clay and a silt soil, with (K1) and without (K0) K fertilizer. Ammonium acetate lactate-extractable K (K-AL) was rapidly depleted, and in K0 the K-AL level stabilized at 30 and 100 mg K kg -1 in the silt and clay soi…
Disposable gloves made from polyvinyl chloride with and without di(2-ethylhexyl) phthalate (PVC-DEHP, PVC-NP), polyethylene (PE), natural rubber (NR) and nitrile-butadiene rubber (NBR) were investigated with respect to evaporation residue, migrated metals, migrants and residual acrylonitrile. The evaporation residue f…
The main objective of this paper is to summarize CEA data recently obtained on different kinds of steels irradiated at 325°C in the Osiris experimental reactor in a typical PWR environment, that is, pressurized water — P=155 bars — with controlled PWR type chemistry. The different steels studied can be classified in f…
Chitosan (β-(l,4)-2-amino-2-deoxy-D-glucose) is a naturally occurring, abundant biopolymer exhibiting desirable biomaterial properties of biodegradability, low toxicity and good biocompatibility. These properties indicate the suitability of chitosan as a surface for mammalian cell growth. The goal of this thesis is to…
Silicon nanoparticles with diameters ranging from 3 to 50 nm were prepared by thermal evaporation. The nanoparticles showed visible light emissions from 5000 A to 9000 A, with peak intensity at 8000-8200 A, when excited with a He-Cd laser. The intensity increased with decreasing particle size. Based on the photolumine…
We encapsulate a number of fullerenes inside single-walled carbon nanotubes (SWNTs) including C60, La2@C80 and ErxSc3−xN@C80(x=0–3). In addition, a number of metallocenes are seen to form hybrid structures with SWNTs, filling the lumen. Ferrocene is used to show that a particular molecule can be induced to fill the lu…
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The dissolution behaviour of two types of fibres, the biosoluble HT and the traditional MMVF21 stone wool fibres, in synthetic simulated lung fluid (Gamble's solution) at pH 4.5 was investigated in order to clarify the mechanisms, and the effect of the various constituents in the liquid. The Gamble's solution contains…