静电纺丝制备PANi/PEO微/纳米纤维的研究

采用静电纺丝制备了PANi/PEO微/纳米纤维,研究了纺丝液中PANi/PEO的质量比、纺丝电压、注射流速和喷丝针头孔径对纤维形貌的影响.研究结果表明,PEO含量的增加不仅会增强纺丝液的成纤能力,也会增大纤维的平均直径;纺丝电压的提高有利于纤维的细化,但断丝现象也增强;纤维的平均直径随注射流速和喷丝头孔径的增大而增大.所制备出的PANi/PEO纤维直径分布为258～843 nm.     

聚氧化乙烯-酚醛树脂凝胶助留助滤机理的研究与应用

研究了酚醛树脂（PF）与聚氧化乙烯（PEO）配比和pH值对聚氧化乙烯-酚醛树脂的凝胶量和状态的影响,及其与聚氧化乙烯-酚醛树脂体系的助留助滤效果和．抗剪切等性能的关系。实验结果表明：在PH值5～9范围内,凝胶量和强度变化不大,PEO—PF体系的助留助滤效果亦没有明显变化;在该实验条件下,PF：PEO=I时助滤作用最好,PF：PEO=5时细小组分留着率达到最大值。该实验初步验证了凝胶助留助滤机理。     

聚氧化乙烯-蒙脱土复合聚合物电解质室温电导率的研究

采用溶液浇铸法对蒙脱土与聚氧乙烯、LiClO4进行复合制备了聚合物电解质膜。用X射线衍射对蒙脱土及电解质膜进行了结构表征。采用交流阻抗法对复合型电解质膜的离子电导率进行了测试。结果表明：一定量的蒙脱土可以使（PEO）16LiClO4的离子电导率提高几倍。蒙脱土对基体离子电导率提高程度的不同取决于蒙脱土的含量。     

Ag/PEO nanocomposite fabricated in a planar magnetron sputtering

Thin films of silver (Ag)/polyethylene-oxide (PEO) nanocomposite were fabricated by a co-deposition of Ag sputtering particles and PEO thin film on substrates using a planar magnetron sputtering system. The PEO were polymerized from the monomer ethyl glycol dimethyl ether in the magnetron sputtering (MS) plasma. The nanocomposites were characterized by using UV-visible spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and atomic force microscopy (AFM). The correlation was performed between the concentrations of Ag and functional group density in Ag/PEO nanocomposites with the discharge parameters, such as sputtering gas pressure and the distance of target-to-substrate. By using AFM and XRD, it is illustrated that the Ag particles distribute uniformly in the body of nanocomposite and remain in atomic status with preferential growth in facet of (111).     

Interpolymer radical coupling: A toolbox complementary to controlled radical polymerization

The current review focuses on the relevance and practical benefit of interpolymer radical coupling methods. The latter are developing rapidly and constitute a perfectly complementary macromolecular engineering toolbox to the controlled radical polymerization techniques (CRP). Indeed, all structures formed by CRP are likely to be prone to radical coupling reactions, which multiply the available synthetic possibilities. Basically, the coupling systems can be divided in two main categories. The first one, including the atom transfer radical coupling (ATRC), silane radical atom abstraction (SRAA) and cobalt-mediated radical coupling (CMRC), relies on the recombination of macroradicals produced from a dormant species. The second one, including atom transfer nitroxide radical coupling (ATNRC), single electron transfer nitroxide radical coupling (SETNRC), enhanced spin capturing polymerization (ESCP) and nitrone/nitroso mediated radical coupling (NMRC), makes use of a radical scavenger in order to promote the conjugation of the polymer chains. More than a compilation of macromolecular engineering achievements, the present review additionally aims to emphasize the particularities, synthetic potential and present limitations of each system.     

Radiation Synthesis of pH-Sensitive Hydrogels From Carboxymethyl Cellulose/Poly(ethylene Oxide) Blends as Drug Delivery Systems

Gamma irradiation was used to prepare hydrogels from carboxymethyl cellulose (CMC) and poly(ethylene oxide) (PEO) blends in the form of films. The hydrogels were characterized by IR spectroscopy, differential scanning calorimetry, thermogravimetric analysis, mechanical testing, and scanning electron microscopy. The swelling in different buffers of different pH values was also studied. The results indicated the formation of network structure and that the swelling of hydrogels is thermo- and pH-sensitive. The CMC/PEO hydrogels were evaluated for the possible use in drug delivery field, in which the release profile of ketoprofen, as a drug model was investigated.     

Luminescence properties of oxide films formed by anodization of aluminum in 12-tungstophosphoric acid

In this paper, we have investigated luminescence properties of oxide films formed by anodization of aluminum in 12-tungstophosphoric acid. For the first time we have measured weak luminescence during anodization of aluminum in this electrolyte (so-called galvanoluminescence GL) and showed that there are wide GL bands in the visible region of the spectrum and observed two dominant spectral peaks. The first one is at about 425 nm, and the second one shifts with anodization voltage. As the anodization voltage approaches the breakdown voltage, a large number of sparks appear superimposed on the anodic GL. Several intensive band peaks were observed under breakdown caused by electron transitions in W, P, Al, O, H atoms. Furthermore, photoluminescence (PL) of anodic oxide films and anodic-spark formed oxide coatings were performed. In both cases wide PL bands in the range from 320 nm to 600 nm were observed.     

组分玻璃化温度对共混高聚物α内耗峰的影响

选择两组分玻璃化温度较远的PEO/PMMA以及玻璃化温度相近的SAN/PMMA两个均相共混体系为研究对象 ,考察了组分组成对共混物α内耗峰峰高、峰宽以及温频关系的影响 .结果表明 ,共混物α内耗峰峰高及温频关系介于纯组分之间 ,随组分组成有规律地变化 ;PEO/PMMA体系的弛豫谱明显地比纯组分的宽 ,而SAN/PMMA体系的弛豫谱宽度跟纯组分的相差不多 .认为由于PEO/PMMA两组分的玻璃化温度相差甚远 ,组成涨落造成玻璃化温度及弛豫时间的分布变宽 ,因而弛豫谱也很宽     

Lithium Instertion in poly (ethylene oxide )/MoO3 Xerogel Nanocomposite Films

The nanocomposite films were prepared by direct intercalation of poly (ethylene oxide) and PEO into MoO3 xerogel via sol-gel route,The electrochromic behavior and the chemical conditionws of Li^ ions were investigated by cyclic voltammograms,UV-visible spectral transmittance and XPS,The tesults show that the cycling efficiency and the reversibility of insertion/extraciton of Li^ ions in (PEO)1 MoO3 .nH2O nanocomposite film were improved.The intercalation of PEO into MoO3 xerogel modulated the wavelength range of electrochromism and enhanced the electrochromic efficiney,Two different chemical conditions of Li^ ions existing in the interlayer and interstitial positions of MoO3 lattice were observed in MoO3 XEROGEL AND (PEO)1 MoO3.nH2O naocomposite films.     

镁合金表面微弧氧化放电现象及氧化膜特性分析

为研究AZ91D表面微弧氧化过程中的放电现象及膜层特性,采用高速摄像机记录微弧氧化试样表面在Na2Si O3-Na OH电解液体系下放电过程的瞬间图像。用扫描电子显微镜(SEM)对微弧氧化膜层截面形貌和表面形貌进行观察,利用X射线衍射仪(XRD)分析膜层的相组成。结果表明:AZ91D合金在微弧氧化稳定阶段,放电过程呈周期性变化规律。AZ91D合金微弧氧化膜层由致密层与疏松层构成,靠近基体一侧为致密层,膜层外侧为疏松层,在疏松层表面存在微孔和裂纹缺陷,膜层最大厚度约为169μm。陶瓷膜层主要由Mg O和Mg2Si O4相组成,且以Mg O相为主。