Advanced Materials Research Vols. 535-537

Abstract: Two kinds of dendritic 8-hydroxyquinoline ligands were efficiently prepared by convergent method, and characterized by IR, 1H NMR, 13C NMR and MS. The fluorescent properties of dendritic ligands and their Zn(II) complexs were studied. The results indicate that this new methold is readily, which generates virtually no by-products. All dendritic 8-hydroxyquinoline derivatives have good solubility in most of organic solution. These dendritic derivatives show good fluorescence, which can be anticipated as a type of important functioned materials for OLEDs.

Abstract: A series of hydrophilic copolyesters were prepared via copolymerization method with purified terephthalic acid (PTA), ethylene glycol (EG), 5-sodium suflo bis-(hydroxyethyl) isophthalate (SIPE) as the third monomer, and different content of polyols (FMA01) as the fourth monomer. The chemical structures of the hydrophilic copolyester were described by Fourier transform infrared spectroscopy(FTIR), and the thermal properties of the samples were studied by thermogravimetric analysis(TGA) and differential scanning calorimetry(DSC). The hydrophilic properties of the samples were measured by contact angle(CA) measurements. Results showed that such modified copolymers had excellent hydrophilic properties. When SIPE reached 3mol% and FMA01 reached 0.8mol%, the copolyester film turned its wetting property to hydrophilic with water contact angle of 53.7°.

Abstract: Solospun spinning is a new type of wool-spinning methods, Solospun spinning technology principles and characteristics were introduced in the paper, the domestic-manufacture fluted Roller was used on the existing equipment and the production was carried on,In addition to comparing with the traditional ring spinning production ,the structure and performance of two kinds of threads had been tested ， the yarn comprehensive performance judgement was also given.it was proofed that the solospun-spinning yarns was better than the ring spinning yarns.

Abstract: Piezoelectric materials because their special ability to convert bwteen kinetic energy and electrical energy. Therefore, they are widely applicated in the areas such as sensors, resonators etc. However, the electrical degradation phenomenon of piezoelectric materials will cause the degradation of their performance. The electrode materails has been reported can severely influence the electrical degradation of piezoelectric materials. In this paper, the life time of the lead zirconate titanate capacitors with nickel, gold or silver electrodes are investigated. It is suggested that, the poor migration ability of the electrode elements gives the PZT capacitors a longer lifetime. The reason of no observation of the electrode materials in the capacitor material is also discussed.

Abstract: A triblock copolymer of F127 was used as a model additive to influence the growth of calcium carbonate (CaCO3) in a biomimetic synthesis process. The results demonstrate that F127 preferentially interacted with selected faces of calcite and induces the growth along the crystallographic c direction into prisms with mesocrystal architectures. Although only containing ether-oxygen functional groups, F127 is considered as an analogue to an array of polyanions contributing to the special morphogenesis of CaCO3. Consequently, this result provides a wider sense in the significance of the ether-oxygen groups into biomineralization mechanism and an alternative synthetic strategy for special morphology of CaCO3 materials.

Abstract: Atom transfer radical polymerization (ATRP) of methacrylate liquid crystal monomer M (4-((4-(2-(acryloyloxy)ethoxy)benzoyl)oxy)phenyl 4-propylbenzoate) was carried out using CuBr/PMDETA complex as catalyst and 2-bromo-2-methyl-propionic acid ester as initiator. The obtained monomer M and polymer P was characterized via infrared spectroscopy and ¹H NMR. The phase behavior and mesomorphism were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and x-ray diffraction (XRD). The molecular weight and the structure of the polymers were identified with gel permeation chromatography and nuclear magnetic resonance.

Abstract: Using waste expanded polystyrene as the raw material, the azo polymeric dye (I-III) were prepared via nitration, reduction, diazotization and coupling reactions. The structures of the intermediate products and the polymeric dyes obtained were characterized by the FTIR spectra. By UV-Vis absorption spectrum measurements, the relationship among the maximum absorption wavelength, molecular structure and color of polymeric dye was investigated.

Abstract: Molecular imprinting is a technique to prepare polymers with predetermined selectivity, specific recognition and predesigned affinity to a desired molecule. The stability and low cost of molecularly imprinted polymers (MIPs) render them attractive for a broad range of applications. Currently, MIP technique has been widely used in chiral separation. In this study, a series of molecularly imprinted polymers for N-Carbobenzoxy-L-tryptophan (N-Cbz-L-Trp) synthesized in different conditions were prepared in a small scale to simulate the monolithic chiral stationary phases (CSPs) primarily. By coupling in situ processing and batch rebinding evaluation, the type of functional monomers, which likely to affect the chiral selectivity of MIPs, was investigated. It was found that a MIP comprising a mixture of functional monomer 4-vinylpyridine (4-VP) and porogen 1-dodecanol/toluene exhibited the highest binding capacity and chiral selectivity for N-Carbobenzoxy-L-tryptophan. Thereafter, the monolithic MIP synthesized in screened optimum condition is used as chiral stationary phase in HPLC, which shows favourable separating capacity.

Abstract: The modified phenolic resin was synthesized by sol-gel process using in-situ formed nanosized silica. The improved phenolic resin was characterized by IR and TG-DTA analyses .The results show that the interaction between SiO2 nanoparticles and phenolic resin lead to the decrease of concentration of phenolic hydroxyl groups, and introduce the impurity atom Si to the phenolic resin molecule chain, which promotes the heat resistance and stability of phenolic resin. The physicochemical property analyses show that the magnesite-carbon brick using this modified phenolic resin as binder possesses a low apparent porosity and a high bulk density and compression strength.

Abstract: Textile substrates can be treated with suitable polymer solutions to enhance the surface functionality. This paper highlights the application of chitosan (CHT) on 100% wool nonwoven matrix using traditional pad-dry-cure method; and its potential application in medical textiles, specifically wound dressing products. 100% wool nonwoven matrices were prepared by a needle punching process and applied with different concentrations of CHT. The blood uptake and antimicrobial efficacy was evaluated for the CHT-treated samples. It was shown that 0.3% CHT-treated samples demonstrated good absorbency and excellent antimicrobial properties.