Materials Literature
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Abstract The radiation grafting of silk with methacrylamide (MAA) was studied using an electron‐beam (EB) irradiation technique. Two irradiation processes, preirradiation and coirradiation, were compared, and some factors affecting the degree of grafting were investigated. The radiation crosslinking of silk with dimet…
Abstract A set of high‐molecular‐weight, new, side‐chain liquid‐crystalline polyethers was obtained by chemical modification of poly(epichlorohydrin) with potassium 3,4,5‐tris[4‐( n ‐dodecan‐1‐yloxy)benzyloxy]benzoate. The degree of modification depended on the reaction conditions and ranged from 39 to 58%. The highes…
Abstract Electron beam (EB) irradiation of polyvinyl chloride (PVC) was carried out in the presence of three different ethylene–vinyl acetate copolymers (EVA). The mechanical properties of the original and irradiated blends were tested. The gel content measurement, chlorine loss upon electron irradiation, and gel perm…
Two types of equilibrium core structures (denoted symmetric and asymmetric) for $1/2a〈111〉$ screw dislocations in bcc metals have been found in atomistic simulations. In asymmetric (or polarized) cores, the central three atoms simultaneously translate along the Burgers vector direction. This collective displacement of…
New hybrid organic−inorganic materials, based on polyacrylate macromolecules intercalated into Layered Double Hydroxides (LDHs) deriving from Ni(OH) 2, were prepared through an original route made of successive redox exchange reactions ( chimie douce synthesis). The nature of the substituting metallic cation in the sl…
The bis-porphyrin system ZnP(2), in which two zinc porphyrins are connected by a phenanthroline linker in an oblique fashion, acts as a bifunctional receptor towards the complexation of free-base meso-5,10-bis(4'-pyridyl)-15,20-diphenylporphyrin (4'-cis DPyP). In solution, NMR spectroscopy evidenced quantitative forma…
Abstract Specially designed block copolymers have played a role as compatibilizing agents in the system of immiscible polymer blends. We applied lauryl lactam (LA)–caprolactone (CL) block copolymer [P(LA‐ b ‐CL)] as a compatibilizing agent for immiscible poly(vinyl chloride) (PVC) blends with various polymers. These b…
Abstract Epoxidized natural rubbers (ENR‐25 and ENR‐45) were prepared using the performic epoxidation method. Two‐component (ENR–cassava starch) and three‐component (ENR–NR–cassava starch) blends were prepared. ENR‐25 and ENR‐45 were blended with various quantities of gelatinized cassava starch in the latex state. The…
Abstract Polyamideimide (PAI)–epoxysilane (coupling agent) composites were reacted with oligomeric polydimethylsiloxane (PDMS), a condensation product of difunctional silane, by using the sol–gel process, and were then dried into films. After this procedure, the surface, mechanical, and thermal properties were measure…
Abstract A maleic anhydride grafted thermoplastic elastomer (TPE g ) was prepared. The effect of the TPE g on the morphology and performance of polypropylene (PP)/polyamide 6 (PA‐6) blends was studied. The final properties of the blends were tuned through variations in the TPE g /PA‐6 ratios and TPE g and PA‐6 percent…
Abstract The preirradiation method of grafting has been established by ultraviolet radiation. Methyl methacrylate (MMA) was grafted onto jute fiber in an aqueous medium. The variation of graft weight with UV‐radiation time, monomer concentration, and reaction time was investigated. The conversion of monomer into homop…
Abstract Caribbean pine impregnated by the full cell treatment schedule with styrene, furfuryl alcohol (FFA), and styrene–FFA monomers was cured for 48 h at 100°C. Styrene did not penetrate inside the wood cell wall; instead, it adhered on the cell wall surfaces and fill cell lumens. The volume contraction during the…
Abstract Two types of nylon‐1010/MMT nanocomposites were successfully prepared by melt intercalation using a corotating twin‐screw extruder. The nanocomposites were characterized with X‐ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy (TEM), thermogravimetric analysis, differential…
Abstract Methyl methacrylate‐containing bipyridine monomers were synthesized with a hydoxy‐functionalized bipyridine. The 4′‐methyl group of the 2,2′‐bipyridine was used to introduce hydoxy‐functionalized alkyl spacers of two different lengths. Two, different synthetic routes were applied for the preparation of the hy…
Abstract The recycling of carbon black (CB)–filled ethylene propylene diene monomer (EPDM) rubber was carried out by using a newly built continuous ultrasonic grooved‐barrel reactor. Using this reactor, it was possible to increase by two times the output of devulcanized rubber in comparison with the coaxial reactor bu…
Abstract Different samples of poly(vinyl chloride) (PVC) compositions were formulated from PVC, a polar plasticizer such as dioctylphthalate (DOP), and variable proportions of electrically conductive additives such as fast extrusion furnace (FEF) carbon black (CB), poly(vinylpyridine) (PVP), or polyacrylonitrile (PAN)…
In order to study the effect of carbon impurities in plasmas on tungsten first walls, a hydrogen–carbon mixed ion beam was irradiated on tungsten. It was found that a very small amount of carbon (∼0.3% or more) significantly enhanced blister formation. Small blisters appeared in a fluence of ∼10 23 H m −2 and their nu…
A microstructured ionic crystal, K(3)[Cr(3)O(OOCH)(6)(H(2)O)(3)][alpha-SiW(12)O(40)].16 H(2)O (1) was synthesized by the complexation of the Keggin-type polyoxometalate of [alpha-SiW(12)O(40)](4-) with a macrocation of [Cr(3)O(OOCH)(6)(H(2)O)(3)](+). Compound 1 possessed a straight channel, with an opening of approxim…
The entanglement process between water-soluble 5,10,15,20-tetrakis(4-sulfonatophenyl)-21H,23H-porphine and the amphiphilic cyclodextrin (CD) heptakis(2-omega-amino-O-oligo(ethylene oxide)-6-hexylthio)-beta-CD and the occurrence of various species at different porphyrin:CD ratios were studied by a combination of UV/Vis…
A detailed high-pressure study on ${\mathrm{LiAlH}}_{4}$ has been carried out using the ab initio projected augmented plane-wave method. Application of pressure transforms $\ensuremath{\alpha}\ensuremath{-}$ to $\ensuremath{\beta}\ensuremath{-}{\mathrm{LiAlH}}_{4}$ $(\ensuremath{\alpha}\ensuremath{-}{\mathrm{NaAlH}}_{…