Materials Literature
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Abstract A polydisilahydrocarbon, namely, poly(tetramethyldisilylene‐ co ‐styrene), synthesized from dimethyldichlorosilane and styrene in 1 : 0.5 mol ratio under dechlorination conditions was evaluated as an atomic oxygen (AO) resistant coating for polyimide film and C‐polyimide composite. Exposure of the polymer coa…
Abstract Copolymers were synthesized through the chemically oxidative polymerization of N ‐ethylaniline (EA) and aniline (AN) in five acid aqueous media. The polymerization yield, intrinsic viscosity, molecular weight, solubility, solvatochromism, electrical conductivity, and mechanical properties of the copolymer fil…
In recent years, lead has been recognized as a source of environmental pollution; this includes lead use for radiation shielding in radiotherapy. We looked for a new material that could be a lead substitute. We chose a material composed of tungsten and resin. We compared the attenuation coefficient of the material wit…
Piperidinium 9H-fluorene-9-carbodithioate and its 2,7-di-tert-butyl-substituted analogue [(pipH)(S(2)CCH(C(12)H(6)R(2)-2,7)), R = H (1a), t-Bu (1b)] and 2,7-bis(octyloxy)-9H-fluorene-9-carbodithioic acid [HS(2)CCH(C(12)H(6)(OC(8)H(17))(2)-2,7), 2] and its tautomer [2,7-bis(octyloxy)fluoren-9-ylidene]methanedithiol [(H…
The displacement of $\mathrm{C}{\mathrm{O}}_{2}$ by Xe on single-walled nanotube bundles is investigated with Fourier transform infrared spectroscopy (FTIR) and grand canonical Monte Carlo (GCMC) simulations. The FTIR experiments show that $\mathrm{C}{\mathrm{O}}_{2}$ physisorption at $77\phantom{\rule{0.3em}{0ex}}\ma…
A series of bimetallic Al2O3-supported Rh-Ge catalysts was prepared by surface redox reactions under controlled hydrogen atmosphere. The surface properties of these catalysts were probed via in-situ FTIR spectroscopic studies of adsorbed CO and were compared to those of monometallic Rh catalysts that had undergone sim…
Abstract Silicon‐containing polyimides were synthesized by solution polycondensation of bis(3,4‐dicarboxyphenyl)dimethylsilane dianhydride with 3,4‐oxydianiline and 4,4′‐oxydianiline, respectively. All the poly(amic acid) films could be obtained by solution‐casting from N,N ‐dimethylacetamide solutions and thermally c…
Abstract A new type of urethane segmented copolymer was prepared from hydroxyl‐terminated trans ‐polyisoprene (HTTPI) and toluene diisocyanate (TDI). The structures of the copolymer were characterized by FTIR and GPC. Crystalline properties of trans ‐polyisoprene (TPI) segments were investigated using WAXD and DSC tec…
Abstract A series of polyimides were synthesized from 2,2‐Bis(3,4‐dicarboxyphenyl)hexafluoropropane, 2,2‐bis(3‐amino‐4‐hydroxyphenyl)‐hexafluoropropane, and 4,4′‐oxydianiline by chemical imidization. The effects of the diamine ratios on the properties of the films were evaluated through the study of their thermal, ele…
The title iron(II) complex, [Fe(CN)(2)(C(15)H(23)N(3)O(2))].H(2)O, is of interest to the spin-crossover community because of its unusual temperature-dependent magnetic behaviour as well as its relatively high relaxation temperature for the light-induced spin-crossover phenomenon. Structural modifications are strongly…
We describe the synthesis and the physical properties of suspensions of colloidal silicon and silica rodlike particles. In addition to pure silicon and pure silica rods, we have also synthesized silicon rods with a silica shell and silica rods with a fluorescent silica layer. Pre-patterned p-type (100) silicon wafers…
Abstract The chain extension behaviors of two diepoxides, epoxide TDE85 and 711, were studied to evaluate their coupling effects on polyamide 1010 (PA1010). The former gave better coupling effects and a faster reaction rate. The torque of PA1010 melt increased dramatically with reaction time. The effect of the diepoxy…
Abstract An unsymmetrical and noncoplanar heterocyclic dianhydride was synthesized from a bisphenol‐like phthalazinone, 4‐(4‐hydroxylphenyl)‐2,3‐phthalazin‐1‐one, and a series of novel poly(ether imide)s based on it, with intrinsic viscosities of 0.67–1.42 dL/g, were obtained by one‐step solution polymerization in m ‐…
Abstract A series of novel xerogels, based on sodium acrylate (NaA), intercalated hydrotalcite (IHT), and N,N ′‐methylene‐bisacrylamide (NMBA), were prepared by inverse suspension polymerization. The influences of the HT intercalated with acrylic acid (AA–IHT) and with 2‐acryloylamido‐2‐methyl propane sulfonic acid (A…
Abstract Published dielectric relaxation measurements for poly(propylene glycol) and 1,4‐polyisoprene are analyzed to determine the relative effects that thermal energy and volume have on the temperature dependence of the normal‐mode relaxation times, and these are compared with their effects on the temperature depend…
Three (1,8,15,22-tetrasubstituted phthalocyaninato)lead complexes Pb[Pc(alpha-OR)(4)] [H(2)Pc(alpha-OC(5)H(11))(4) = 1,8,15,22-tetrakis(3-pentyloxy)phthalocyanine; H(2)Pc(alpha-OC(7)H(15))(4) = 1,8,15,22-tetrakis(2,4-dimethyl-3-pentyloxy)phthalocyanine; H(2)Pc(alpha-OC(10)H(7))(4) = 1,8,15,22-tetrakis(2-naphthyloxy)ph…
Abstract Mercerization and acetylation treatments were applied to sisal fibers to enhance adhesion with polymer matrices in composites. The structures of the untreated and treated fibers were assessed with scanning electron microscopy. The waste from sisal‐fiber decortication consisted of mechanical, ribbon, and xylem…
A comprehensive study of static, dynamic and electronic properties of liquid $\mathrm{Al}$ in a thermodynamic state near its triple point was performed by means of 205-particle ab initio molecular dynamics simulations using Kohn-Sham density-functional theory and the Langevin equation of motion. The good agreement of…
Abstract Summary: The crystallization behavior of crystalline‐crystalline diblock copolymer containing poly(ethylene oxide) (PEO) and poly( ε ‐caprolactone) (PCL), in which the weight fraction of PCL is 0.815, has been studied via differential scanning calorimeter (DSC), wide‐angle X‐ray diffraction (WAXD), and polari…
IR studies show that Cu + ions in zeolites CuX, CuY, and CuZSM-5 are able to activate C C bond in alknenes (ethene, propene, but-1-ene, and cis -but-2-ene). The stretching frequency of the C C− band decreased by 78−115 cm -1, indicating a significant weakening of the double bond. In ethene, the IR inactive C C stretch…