Probe beam deflection study of the ion exchange between Prussian blue film or indium hexacyanoferrate film and electrolyte solutions

Probe beam deflection(PBD) technique together with electrochemical techniques such as cyclic voltammetry was used to study the ion exchange in prussian blue(PB) film and its analogue indium hexacyanoferrate (InHCF) chemically modified electrodes, The ion exchange mechanism of PB was verified as following: K2Fe2+FeI(CN)(6)(-e--K+)reversible arrow(+e-+K+)KFe(3+)Fe(I)(CN)(6)(-xe--xK+)reversible arrow(+xe-+xK+) [Fe3+FeI(CN)(6)](x)[KFe3+FeI(CN)(6)](1-x) where on reduction in contact with an acidic KCl electrolyte, H+ enter PB film before K+. Both the cations and anions participate concurrently in the redox process of InHCF, meanwhile K+ ion plays a major role in the whole charge transfer process of this film with increasing radii of anions.

Crystal structure dependence of the luminescence of rare earth ions (Ce3+, Tb3+, Sm3+) in Y2SiO5

The luminescence properties of Ce3+, Tb3+, Sm3+ and energy transfer from Ce3+ to Tb3+ were studied in two modifications of Y2SiO5 (low temperature X(1) type and high temperature X(2) type). The Ce3+ cation shows lower emission energy and larger Stokes shift in X(1)-Y2SiO5 than in X(2)-Y2SiO5, and the emission intensities of Ce3+, Tb3+, Sm3+ in the former are weaker than those in the latter. There exists an energy transfer from Ce3+ to Tb3+ in both types of Y2SiO5, and the transfer efficiency in X(2) type is higher than that in X(1) type. All of these results are discussed in relation to the crystal structure of Y2SiO5.

含羧基的聚乙烯醇胺肟螯合纤维的合成及对钯的吸附

利用（６０）ＣＯγ射线预辐照接枝和胺肟化反应合成了含羧基的聚乙烯醇胺肟（ＰＶＡＡＯ－ＡＡ）螯合纤维。预辐照剂量和接枝单体的比率对接枝率、胺肟基因含量和吸附容量有影响。研究了ＰＶＡＡＯ－ＡＡ螯合纤维对钯的吸附性能。

偏转法研究普鲁士蓝及六氰亚铁铟膜与电解质溶液间的离子效应

用现场偏转法结合循环伏安法研究了普鲁士蓝（ＰＢ）及六氰亚铁铟（ＩｎＨＣＦ）膜的电化学氧化还原过程。证实了ＰＢ膜的离子交换的机理为：且酸性条件下还原ＰＢ膜是Ｈ~＋先于Ｋ~＋进入膜内。还原态的ＩｎＨＣＦ膜氧化时，溶液中的阴阳离子同时参与了该反应，但随着阴离子的增大，Ｋ~＋成为该反应的主要参与者。

COMPATIBILIZATION OF HIGH-DENSITY POLYETHYLENE/POLYISOPRENE BLENDS WITH POLYETHYLENE/POLYISOPRENE THREAD-THROUGH COPOLYMERS

The compatibilization of high density polyethylene (HDPE)/polyisoprene (PI) blends with polyethylene/polyisoprene (PE/PI) ''thread-through'' copolymers was investigated. The proliferating structure of PE/PI with segments chemically identical to HDPE and PI, respectively, is different from that of graft copolymers. Studies showed that the dispersed domain size in the blends was significantly reduced and interfacial adhesion was improved by the compatibilization action of the copolymer. In the differential scanning calorimetry (DSC) analysis, the crystallization peak of HDPE in the blends became broad with adding the copolymer and fractionated crystallization appeared in the HDPE/PI blend compatibilized with the copolymer at a weight ratio of 30/70 while it appeared in the blend without copolymer at a weight ratio of 20/80. DMA results showed that by adding the copolymer, both the glass transition temperature (T-g) of the PI component and the alpha-relaxation of HDPE shifted to lower temperature, demonstrating the enhanced penetration of the two components. Mechanical properties of the blends were improved, especially the elongation at break, by the presence of the copolymers. The characteristic yielding at the fractured surface of the blends compatibilized with the copolymer indicates the fractural behavior of the material changed from brittle to tough.

NMR-STUDY OF MISCIBILITY AND MORPHOLOGY OF POLYIMIDE POLYIMIDE BLENDS

The miscibility and morphology of polyimide/polyimide blends, PEI-E/PTI-E(a)) and PBPI-E/IPTI-E(a)), have been studied by means of C-13 CPMAS NMR technique. The results indicate that PEI-E/PTI-E blends are miscible on a molecular level, but molecular aggregation exists in pure PBPI-E specimen as well as PBPI-E/PTI-E blends with high content of PBPI-E, which vanishes in the blends with high content of PTI-E. When the content of PBPI-E is higher than that of PTI-E, the addition of PTI-E to PBPI-E has almost no effect on the size of the PBPI-E rigid domains, but has a large effect on the populations of the PBPI-E rigid domains. It is the intermolecular charge-transfer interaction that plays a critical role in the miscibility of PEI-E/PTI-E and PBPI-E/PTI-E blends.

SYNTHESIS OF A POLYETHYLENE-GRAFT-POLYSTYRENE COPOLYMER AND ITS COMPATIBILIZATION FOR LINEAR LOW-DENSITY POLYETHYLENE/POLY(PHENYLENE OXIDE) BLENDS

Based on unsteady diffusion kinetics, polyethylene(PE)-graft-polystyrene (PS) copolymers were designed and synthesized with a heterogeneous high yield titanium-based catalyst by copolymerization of ethylene with a PS-macromonomer using 1-hexene as a short chain agent to promote the incorporation of the PS-macromonomer. The presence of 1-hexene facilitated the diffusion of the PS-macromonomer, giving rise to the significantly increased incorporation of the PS-macromonomer. Compatibilization of blends of linear low density polyethylene (LLDPE)/poly(phenylene oxide) (PPO) with the PE-g-PS copolymer were investigated using scanning electron microscopy (SEM) and dynamic mechanical analysis (DMA).

STUDIES ON STRUCTURE OF EO/THF RANDOM COPOLYETHER(I) - NMR-STUDIES ON SOLUTION ACTION AND COMPLEX

The special action of TEO solution was investigated by 1D, 2D-NMR in CDCl3. For the present measurements, when the concentration of TEO was higher in CDCl3, the chemical shift difference (Delta delta) and the peak number of C-13 NMR spectrum were changed with increasing the solution concentration, At lower concentration(< 3% V/V ), the peaks will be closed together for -CH2O- resonance carbon and it is not the appearance of the narrowed, When temperature was changed, the Delta delta value was contrary to the solvent effect, So, the shifts of the resonance carbon in the NMR spectra indicated clearly that the complex formation for the system of CDCl3, and TEO molecular interaction were affected by the experiment temperature and the solution concentration.

裂解色谱法测定环化顺1,4聚丁二烯的环化度

用裂解色谱法(PGC)研究了不同环化度的环化顺1,4聚丁二烯(CPBd)。建立了测定CPBd环化度的方法。分析了不同实验条件下生成的CPBd的环化度,结果与NMR测定值一致。

EO／THF无规共聚醚结构研究（Ⅱ）──NMR方法研究溶剂配合物与溶液行为

用１Ｄ－ＮＭＲ和２Ｄ－ＮＭＲ方法研究了ＥＯ／ＴＨＦ共聚醚（ＴＥＯ）的溶液行为。ＴＥＯ在浓溶液状态，其溶液浓度不仅使谱峰化学位移值增减，而且使峰型发生较大的变化。当改变温度时，~（１３）ＣＮＭＲ谱在高场区有如同溶剂化效应的过程，实验结果表明：浓度与温度使ＴＥＯ溶液分子内部结构发生变化。２Ｄ－ＮＯＥＳＹ实验表明：在低浓度情况下，ＴＥＯ分子易与活泼氢溶剂生成配合物，分子间偶极－偶极相互作用受温度和浓度的影响。

二价铕中性芳烃配合物［Eu（C_6Me_6）（AlCl_4）_2_4·Me_4

首次合成了二价铕中性芳烃配合物［Ｅｕ（Ｃ６Ｍｅ６（ＡｌＣｌ４）２］·Ｍｅ４Ｃ６Ｈ２，并经红外光谱，激发光谱和荧光光谱表征，测定了晶体结构。配合物属单斜晶系，Ｐ２／ｃ空间群，晶胞参数ａ＝１．７６５２（４）ｎｍ，ｂ＝１．５９１８（４）ｎｍ，ｃ＝１．８７５２（５）ｎｍ；β＝９７．６１（５）°，Ｚ＝２，Ｒ＝０．０４９６，Ｒｗ＝０．０４６２。

聚吡咯电化学掺杂过程的拉曼光谱研究

共轭导电聚合物经过掺杂,电导率可以提高十几个数量级,由绝缘体变为导体.但是,掺杂对聚合物链结构的影响方面,人们目前尚所知甚少.从实验的角度看,由于物性测量结果和材料的制备过程密切相关,往往不容易重复,有时还会出现一些令人困惑的假象.电化学现场物性测量技术可以针对同一样品,由电化学方法改变掺杂最,就可

等温熔体结晶尼龙1010的晶体结构

WAXD研究表明,在结晶温度T_c≤196℃时,尼龙1010等温熔体结晶样品的结晶度X_c和微晶尺寸L_(100)随T_c升高近乎线性增大,而氢键面上的相对衍射强度R却降低;T_c>196℃后三者与T_c关系发生相反变化。结晶速率快时有利于分子链在垂直于氢键平面方向上堆砌,反之有利于在平行于氢键平面方向上生长。

常规二脉冲叠加四阶跃微分伏安法研究——可逆电极过程的理论和验证

推导并验证了作者提出的新型阶跃伏安技术——常规二脉冲叠加四阶跃微分伏安法可逆电极过程的理论电流方程,同时研究了各项参数如扫描增量(E_s)、脉冲高度(ΔE)、脉冲周期(T)等对实验的影响,理论与实验结果一致。

SURFACE-MODIFIED HYDROPHILIC MEMBRANES IN MEMBRANE DISTILLATION

The porosity and the hydrophobicity of membranes are two essential requirements for membrane distillation (MD) of aqueous solutions. So far, the hydrophobic porous membranes used in MD studies have been prepared from hydrophobic materials. In this work, hydrophilic cellulose acetate and cellulose nitrate membranes were modified into hydrophobic membranes by radiation grafting polymerization and plasma polymerization, and used in MD studies successfully. The results indicated that modified membranes with good performance in MD can be obtained if the modifying conditions are controlled appropriately. Especially plasma polymerization, in which many particular kinds of monomer could be polymerized onto the surface of porous materials, has become an efficient method to prepare hydrophobic porous membrane with high performance from hydrophilic membranes. It will stimulate the development and practical application of MD.