Novel polyquinolines containing phenylamine moiety

Two novel conjugated polyquinolines (F-PA-PQ and Cz-PA-PQ) with the phenylamine moiety as hole-transporting segment were synthesized. The resulting polyquinolines exhibited excellent thermal stabilities (Tg > 200degreesC), good solubility in common organic solvents and film-forming properties. Their optical absorption, photoluminescence, electroluminescence and sensory properties were studied.

Synthesis and properties of PPP-based copolymers containing phenothiazine moiety

Novel soluble alternating conjugated copolymers (PFSP and PFSR) comprised of phenothiazine unit are synthesized by palladium-catalyzed Suzuki coupling reactions. Their thermal stability, photoluminescence, electroluminescence, hole injection and transport properties are investigated. The resulting copolymers exhibit good thermal stability and excellent hole-injection ability (about -5.2eV), which are closely matched to the work function of ITO. Double-layer devices demonstrate that PFSP is a promising hole-transporting material for electroluminescent devices.

Novel PPV-based light-emitting polymers containing siloxane moiety

Two PPV-based copolymers consisting siloxane linkage have been synthesized by melt condensation of bisphenol and dianilinodimethylsilane. The rigid PPV segments act as chromosphere and allow fine turning of band gap for blue-light emission, while the flexible siloxane units lead to the effective interruption of conjugation and the enhancement of solubility. The UV-vis absorption, photoluminescent and eletroluminescent properties have been studied.

Zinc-based light-emitting materials containing oxadiazole moieties

Two oxadiazole-based zinc complexes containing naphthalene moiety with different coordination site are synthesized and characterized. Their thermal stability, photoluminescent and electroluminescent properties are investigated. The resulting complexes have good thermal stability and show bright blue fluorescence in the solid state. Their electroluminscent wavelengths are dependent on the coordination site of naphthalene moieties.

Preparation of multilayer films containing pt nanoparticles on a glassy carbon electrode and application as an electrocatalyst for dioxygen reduction

In this paper, a simple route for the preparation of Pt nanoparticles is described. PtCl62- and [tetrakis-(N-methylpyridyl)porphyrinato] cobalt (CoTMPyP) were assembled on a 4-aminobenzoic acid modified glassy carbon electrode through the layer-by-layer method. The three-dimensional Pt nanoparticle films are directly formed on an electrode surface by electrochemical reduction of PtCl62- sandwiched between CoTMPyP layers. Regular growth of the multilayer films is monitored by UV-vis spectroscopy. X-ray photoelectron spectroscopy verifies the constant composition of the multilayer films containing Pt nanoparticles. Atomic force microscopy proves that the as-prepared Pt nanoparticles are uniformily distributed with average particle diameters of 6-10 nm. The resulting multilayer films containing Pt nanoparticles on the modified electrode possess catalytic activity for the reduction of dissolved oxygen. Rotating disk electrode voltammetry and rotating ring-disk electrode voltammetry confirm that Pt nanoparticle containing films can catalyze an almost four-electron reduction of O-2 to water in 0.5 M H2SO4 solution.

Blue organic light-emitting diodes based on an oxadiazole-containing organic molecule exhibiting excited state intramolecular proton transfer

A blue organic light-emitting device based on an emissive layer of 2-(2-hydroxyphenyl)-5-phenyl-1,3,4-oxadiazole (HOXD), which exhibits excited state intramolecular proton transfer (ESIPT), was presented. The device had a luminance efficiency of 0.8 cd/A and a maximum brightness of 870 cd/m(2). Our studies indicate that some EL may originate from the triplet excitation state of the enol form of HOXD.

Computer simulation of miscibility and self-assembly structure for polymer-containing systems with special interactions

The miscibility and structure of A-B copolymer/C homopolymer blends with special interactions were studied by a Monte Carlo simulation in two dimensions. The interaction between segment A and segment C was repulsive, whereas it was attractive between segment B and segment C. In order to study the effect of copolymer chain structure on the morphology and structure of A-B copolymer/C homopolymer blends, the alternating, random and block A-B copolymers were introduced into the blends, respectively. The simulation results indicated that the miscibility of A-B block copolymer/C homopolymer blends depended on the chain structure of the A-B copolymer. Compared with alternating or random copolymer, the block copolymer, especially the diblock copolymer, could lead to a poor miscibility of A-B copolymer/C homopolymer blends. Moreover, for diblock A-B copolymer/C homopolymer blends, obvious self-organized core-shell structure was observed in the segment B composition region from 20% to 60%. However, if diblock copolymer composition in the blends is less than 40%, obvious self-organized core-shell structure could be formed in the B-segment component region from 10 to 90%. Furthermore, computer statistical analysis for the simulation results showed that the core sizes tended to increase continuously and their distribution became wider with decreasing B-segment component.

Liquid-liquid phase behavior of toluene/polyethylene oxide/poly(ethyleneoxide-b-dimethylsiloxane) polymer-containing ternary mixtures

The experimental data of phase diagrams for both polyethylene oxide/poly(ethylene oxide-b-dimethylsiloxane) binary and toluene/polyethylene oxide/poly(ethylene oxide-b-dimethylsiloxane) ternary polymer-containing systems was obtained at atmosphere pressure by light scattering method. The critical points for some pre-selected compositions and the pressure effect on the phase transition behavior of ternary system were investigated by turbidity measurements. The chosen system is a mixture of ternary which is one of the very few abnormal polymer-containing systems exhibiting pressure-induced both miscibility and immiscibility. This unusual behavior is related to the toluene concentration in the mixtures. The effect of toluene on the phase transition behavior of the ternary polymer-containing mixture was traced. Such behavior can make it possible to process composite materials from incompatible polymers.

Thermodynamical study on pressure-induced compatibility in UCST polymer-containing mixtures

The present calculations were performed on the basis of the Sanchez-Lacombe lattice fluid theory and the new combinatorial rules for block copolymer according to the experimental results on the pressure-induced compatibility in poly(ethylene oxide) (PEO) and poly(ethylene oxide-b-dimethylsiloxane) (P(EO-b-DMS)) mixtures with UCST behavior. The study on enthalpy, combinatorial entropy, vacancy entropy and Gibbs energy upon mixture shows that Sanchez-Lacombe fluid theory and the new combinatorial rules could describe the pressure-induced compatibility (PIC) of polymer mixtures with UCST behavior well.

A new type of highly efficient luminescent material - The system Al2O3-B2O3 containing Ce3+ and Tb3+ ions

The system Al2O3-B2O3 containing Ce3+ and Tb3+ ions was investigated for the first time. It was found that certain compositions give rise to a new highly efficient green luminescent material.

Novel two-dimensional sodium molybdenum phosphates containing {M(enMe)(2)}(2+) bridging groups (M = Ni, Cu; enMe=1,2-diaminopropane)

Two novel organic-inorganic hybrid compounds, (H(2)enMe)(4)(H3O)[Ni(enMe)(2)].[Na3Mo12O52P8(OH)(10)].5H(2)O (1) and (H(2)enMe)(4)(H3O)[Cu(enMe)(2)].[Na3Mo12O52P8(OH)(10)].5H(2)O (2) (enMe = 1,2-diaminopropane), have been hydrothermally synthesized and characterized by elemental analyses, IR, EPR, XPS, UV-Vis spectra and TG analyses. Single crystal X-ray diffraction shows that 1 and 2 are isostructural compounds. Both the compounds exhibit an unusual two-dimensional (2-D) window-like network consisting of one-dimensional (1-D) chains of sodium molybdenum phosphate anions connected by transition metal coordination complexes cations. Compound 1 and 2 represent the first 2-D molybdenum phosphate skeleton pillared by transition metal complex fragments.

PB-g-PMMA核壳粒子的合成及其在PVC中的分散

聚丁二烯(PB)橡胶粒子与聚氯乙烯(PVC)不相容。采用乳液聚合手段,在聚丁二烯乳胶粒表层接枝与聚氯乙烯相容的聚甲基丙烯酸甲酯(PMMA)充当增容剂制备了聚丁二烯接枝聚甲基丙烯酸甲酯(PB g PMMA ,MB)核壳粒子。用熔融共混法制备了PVC/MB共混物。SEM照片表明,这种核壳结构的粒子在聚氯乙烯中的分散情况随着核壳比的不同而改变,当核壳质量比小于93/7时能够完全均匀地分散在PVC基体中,核壳质量比大于94/6时根本不能分散在PVC基体中,核壳质量比为93/7是粒子能否分散开的转折点。共混物的力学性能数据表明,当MB加入量改变时,共混物也存在脆韧转变点,但受MB粒子的核壳比影响。

Adsorption studies of divalent metal ions with extraction resin containing 1-hexyl-4-ethyloctyl isopropylphosphonic acid

Equilibrium distributions of cobalt(II), nickel(II), zinc(II), cadmium(II), and copper(II) have been studied in the adsorption with extraction resin containing 1-hexyl-4-ethyloctyl isopropylphosphonic acid (HEOPPA) as an extractant from chloride medium. The distribution coefficients are determined as a function of pH. The data are analyzed both graphically and numerically. The extraction of the metal ions can be explained assuming the formation of metal complexes in the resin phase with a general composition ML2(HL)(q). The adsorbed species of the metal ions are proposed to be ML2 and the equilibrium constants are calculated. The efficiency of the resin in the separation of the metal ions is provided according to the separation factors values. The separation of Zn from Ni, Cd, Cu, Co, and Co from Ni, Cd, Cu with the resin is determined to be available. Furthermore, Freundlich's isothermal adsorption equations and thermodynamic quantities, i.e., DeltaG, DeltaH, and DeltaS are determined.

ABS树脂合成中影响PB-g-SAN接枝共聚物接枝率的因素

采用种子乳液聚合方式 ,以 K2 S2 O8为引发剂引发聚合 ,合成了一系列 PB- g- SAN接枝共聚物。考察了引发剂用量、分子量调节剂 (TDDM)用量和橡胶 (PB)含量对 PB- g- SAN接枝共聚物接枝率的影响。并将 K2 S2 O8引发剂与氧化 -还原引发体系做了比较。结果表明 ,随着引发剂 K2 S2 O8用量逐渐增加 ,PB- g- SAN接枝共聚物的接枝率逐渐降低。引发剂用量太少时 ,不能满足聚合要求 ,PB- g- SAN接枝共聚物的接枝率也会降低。随着分子量调节剂 (TDDM)用量的增加 ,PB- g- SAN接枝共聚物的接枝率逐渐降低。随胶含量的增加 ,PB- g- SAN接枝共聚物的接枝率逐渐降低。采用氧化 -还原引发体系引发聚合有利于接枝反应的进行 ,在 PB含量相同时 ,采用氧化 -还原引发体系合成的 PB- g- SAN接枝共聚物的接枝率比采用 K2 S2 O8合成的接枝共聚物接枝率高。