Materials Literature
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The uses of polyurethane foams have been increased too much as new abilities are known for these polymers. This increments lead to an ecological problem. They have low density, occupying large spaces and not easy degradable. This causes environmental pollution that is a disadvantage of artificial materials. In this st…
Abstract To prepare hard and transparent poly (methyl methacrylate)‐silica coat film on glass or polycarbonate substrates, poly(methyl methacrylate‐ co ‐2‐hydroxyethyl methacrylate) random copolymers and perhydropolysilazane (PHPS) were blended in solution. Then the solution was cast on the substrates. The grafting of…
A Y 2 O 3 :Yb nanoscale magnet that belongs to the cubic C-type or bixbyite structure family was synthesized by high energy ball milling (HEBM). An as-prepared sample (S1) was annealed at 650 °C (S2) and 950 °C (S3). Cation populations were determined by the refinement of site occupancies. It was found that in S1 and…
The modeling of ring-opening polymerization of (D,L)-lactide to poly(lactic acid) (PLA) has been performed. Except some reported data on the apparent rate constant, there is lack of data in the literature on the rate constants for initiation, propagation and termination steps of PLA polymerization. Using a simple nume…
Abstract A simple method for preparing LiCaAlF 6 :Eu 2+ phosphor is reported. Photoluminescence (PL) and thermoluminescence (TL) studies were carried out. The TL sensitivity of the phosphor is nearly twice that of CaSO 4 :Dy TLD phosphor. Several other properties required for TL dosimetry are superior as well. It is s…
Among different polyethylene cross-linking methods, such as peroxide, irradiation, and silane cross-linking, silane-based methods are the most suitable methods for producing cable insulation and hot water pipe materials due to process simplicity and superior properties of its product. Some electrical, thermal and mech…
The field of cardiovascular tissue engineering has experienced tremendous advances in the past several decades, but the clinical reality of engineered heart tissue and vascular conduits remains immature. Stem cells and progenitor cells are promising cell sources for engineering functional cardiovascular tissues. To re…
The thermal stability of waterborne polyurethanes was measured by use of the thermogravimetric analysis. Waterborne polyurethanes (wbPUR) with catalysts of different selectivity were characterized using dynamic heating. In the dynamic method, heating rates with increments of 0.5, 1, 2, 5, and 10°C min−1 were used in t…
Abstract In this article, the dynamic vulcanization process was applied to polypropylene (PP)/Novolac blends compatibilized with maleic anhydride‐grafted PP (MAH‐ g ‐PP). The influences of dynamic cure, content of MAH‐ g ‐PP, Novolac, and curing agent on mechanical properties of the PP/Novolac blends were investigated…
One of the key issues for the development of high toughness carbon nanotube (CNT) reinforced composites is the control of the interfacial bond between the CNT and the matrix. Here, we introduce a novel technique to facilitate the homogeneous coating of single-walled carbon nanotube (SWCNT) bundles with polycarbosilane…
The measurements on radioactive actinide isotopes (curium-248) were performed using very small sample quantities (micrograms) to minimize the sample activity. Resonant inelastic x-ray scattering (RIXS) spectra of curium oxide at the Cm $5d$ edge were measured for the first time. RIXS data are compared with theoretical…
Abstract Incorporation of zeolite into polyurethane (PU) membranes was investigated by using as‐synthesized and calcined zeolite beta particles at two different loading contents (0.1 and 1 wt %). The chemical interaction between the zeolite beta crystals and PU was observed by ATR‐FTIR spectroscopy. The SEM results su…
Abstract Electrochemical polymerization of 3,4‐ethylenedioxythiophene (EDOT) was carried out in presence of two different surfactants, sodium dodecyl sulfate (SDS) and cetyl trimethyl ammonium bromide (CTAB) in aqueous medium. The cyclic voltammograms of the polymers exhibited well‐defined redox peaks at E ox = 140 mV…
Abstract The melting, crystallization behaviors, and nonisothermal crystallization kinetics of the ternary blends composed of poly(ethylene terephthalate), poly(trimethylene terephthalate) (PTT) and poly(buthylene terephthalate) (PBT) were studied with differential scanning calorimeter (DSC). PBT content in all ternar…
The temporal evolution of the coordination environments of B atoms in simple and complex borosilicate glasses following temperature jumps near the glass-transition temperature has been studied using $^{11}\mathrm{B}$ magic-angle-spinning NMR spectroscopy. The relaxation kinetics for boron speciation is found to be in…
Abstract Good optical quality single crystals of zinc hydrogen phosphate (ZnHPO 4 ) having dimensions up to 8×2×2 mm 3 have been grown with the aid of sodium meta silicate gel. Single crystal XRD studies confirm that the crystal belongs to the orthorhombic system with space group P2 1 2 1 2 1 . The functional groups p…
Blends of poly(vinyl chloride) (PVC) and poly(butylene adipate) (PBA) with varying degrees of branching were analyzed with respect to migration resistance during aging in water, preservation of material properties, and thermal stability. Gas chromatography-mass spectrometry, water absorption, weight loss, thermogravim…
1,6-Diisocyanatohexane and dimethyl sulfoxide were exploited as crosslinking agent and reaction solvent, respectively, for gelatin modification. Crosslinked samples were fractionated and analyzed by thermogravimetric analysis, infrared spectroscopy, acid and base titrations, and swelling measurements. The yield of cro…
Abstract The oxidative polycondensation reaction conditions of 2‐methoxy‐6‐[(4‐methylphenyl)imino]methylphenol (2M‐4‐MPIMP) by using oxidants such as air O 2 , H 2 O 2 and NaOCl were studied in an aqueous alkaline medium between 30 and 90°C. The structures of synthesized monomer and oligomer were confirmed by FTIR, UV…
A straightforward methodology towards the supramolecular synthesis of novel organometallic polymers with attractive optical properties is presented. By coordinating bifunctional fluorescent cruciform molecules through ditopic metalated pincer complexes (Pd or Pt), we have synthesized a new class of well-defined coordi…