水溶液中稀土离子与甘氨酰丙氨酸作用的NMR研究

利用~1H和~(13)C NMR技术研究了水溶液中稀土离子与二肽甘氨酰丙氨酸(以下简称甘-丙二肽,记为GA)的配位作用。由稀土诱导位移的浓度依赖关系计算了Yb与甘-丙二肽配合物的稳定常数。测定了重稀土离子Dy~(3+)、Ho~(3+)、Er~(3+)、Tr~(3+)和Yb~(3+)作用下GA的~(13)C诱导位移,并根据Reuben方法对稀土诱导位移进行了线性相关分析。对配合物中配体骨架构象的模拟分析指出,Cl-C_2-N-C_3为旁式,C_2-N-C_3-C_4和C_5-C_2-N-C_3为反交叉式。系统比较了4种含甘氨酰二肽的侧基大小对配合物稳定常数、配体构象和配合物溶液结构的影响。

WATER-SOLUBLE AND AMPHIPHILIC POLYMERS .6. A STUDY ON THE SURFACE-COMPOSITION OF CAST FILMS OF PST/PMAA AND PEO-PST-PEO BLOCK POLYMERS BY XPS

Thin films of PSt/PMAA and PEO-PSt-PEO block polymers were deposited on a polystyrene substrate by solution adsorption (with or without solvent treatment), and the film surfaces were characterized by means of XPS. Direct solvent - casting of PEO-PSt-PEO from benzene solutions resulted in PSt-rich surfaces, whereas PMAA richer surfaces were obtained for PSt/PMAA films cast from DMF solutions. Moreover, solvent treatment after casting had profound effect on the film surface composition. Treatment with water markedly increased the surface concentration of polar PEO segments. In the case of PSt-PMAA block polymers, the PSt content on the surface increased in the order of water < ethanol < cyclohexane < petroleum ether, the last-named giving films with almost pure PSt surface. It is well worth noticing that the bulk composition had little to do with the surface composition for both PSt/PMAA and PEO-PSt-PEO block polymers within the composition range investigated when subsequent solvent treatment was applied.

WATER-SOLUBLE AND AMPHIPHILIC POLYMERS .7. SYNTHESIS AND CHARACTERIZATION OF A NOVEL COMB-TYPE AMPHIPHILIC POLYMER PAMC16S

A novel comb-like amphiphilic polymer, poly (2-acrylamidohexadecylsulfonic acid) (PAMC16S), was synthesized by free radical polymerization of the corresponding amphiphilic monomer in 1,4-dioxane-water mixed solvents. Depending on the ratio of water/dioxane in the solvent, the reaction proceeded by either precipitation polymerization or micellar polymerization. The molecular weight of the polymer obtained under similar conditions decreased and subsequently increased with the increase of water content in the mixed solvent. The polyion nature of PAMC16S was confirmed by viscosity data of ethanolic solutions. In addition, the polymer was characterized by solubility, IR, TG and wide angle X-ray diffraction methods.

THE CRYSTALLIZATION BEHAVIOUR OF BLOCK COPOLYMER/HOMOPOLYMER BLENDS I. INFLUENCE OF NONSPHERICAL MICELLE ON CRYSTALLIZATION BEHAVIOUR IN DILUTE SOLID SOLUTIONS

The effect of micelle on crystallization behaviour of dilute poly(methyl methacrylate-b-tetrahydrofuran) diblock copolymer/tetrahydrofuran homopolymer, dilute poly (ethylene-b-styrene-b-ethylene) triblock copolymer/ethylene homopolymer solutions has been studied. The results show that with the structural teansitions from spherical to nonspherical micelle in the blends, great changes in the nucleation and spherulite morphologies take place.

COMPATIBILIZING EFFECT OF POLY(ETHYLENE OXIDE)-B-POLYSTYRENE-B-POLY(ETHYLENE OXIDE) IN PHENOLPHTHALEIN POLY(ETHER ETHER KETONE) POLY(2,6-DIMETHYL-1,4-PHENYLENE OXIDE) BLENDS

The morphology and mechanical behaviour of phenolphthalein poly(ether ether ketone) (PEK-C)/poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) blends has been investigated. A poly(ethylene oxide)-b-polystyrene-b-poly(ethylene oxide) (PEO-PS-PEO) triblock copolymer was used as compatibilizer. It was found that PEO-PS-PEO has a compatibilizing effect on the PEK-C/PPO blends. The addition of PEO-PS-PEO to the blends greatly improves phase dispersion and interfacial interfacial adhesion and also enhances the ultimate tensile strength and Young's modulus at compositions ranging from 30 to 70% PEK-C. However, all the values of the ultimate tensile strength within the whole composition range are lower than those expected by simple additivity, probably owing to the poor mechanical properties of PEO-PS-PEO copolymer.

尼龙-1010 SAXS研究

用一维电子密度相关函数方法,分析了国产尼龙-1010不同拉伸比时的SAXS现象,由实验相关函数曲线可算得长周期(L),中间层厚(d_(tr)),片晶层厚(d_?),非晶层厚(A_?),平均片层厚(d),积分不变量(Q),比内表面O_s以及(η_c-η_a)等数值及其变化规律。实验结果表明尼龙-1010的结晶结构是由结晶层、非晶层以及结晶-非品中间层三部分组成。

液/液界面新溶剂体系的电化学研究

用循环伏安法测定了离子在水-异硫氰酸烯丙脂(AIT)体系中的标准转移Gibbs能△_o~w G_(tr,i)~0。对含有AIT的混合溶剂的研究,发现了一系列电位窗比较宽的水/有机溶剂体系,讨论了溶剂效应对△_o~w G_(tr,i)~0的影响。

胆碱类药物的液液界面电化学研究

用循环线性电流扫描计时电位法(CLC)、循环伏安法(CV)和微分脉冲伏安法(DPV)研究了五种胆碱类药物在水/硝基苯界面(W/NB)上的转移行为.在水相溶液呈碱性时,观察到了伴有不可逆水解反应的相转移过程.讨论了药物结构中的取代基效应,并依据离子转移的标准 Gibbs 能△_o~wG_(tr)~o 度量了取代基的疏水性效应及药物的脂溶性.

磷钼钒杂多阴离子的液/液界面电化学研究

用循环伏安法研究了V~vMo_(11)-V_5~vMo_7杂多阴离子在水/硝基苯界面的转移行为,观察了溶液酸度对转移行为的影响及杂多阴离子稳定存在的pH范围。钒取代的杂多阴离子稳定性较12-磷钼杂多酸显著提高,但随钒原子数增加离子稳定性降低。在“电位窗”内转移的离子主要为-4价,转移过程为扩散控制。由循环伏安实验得到了杂多阴离子的表观转移电位Δ_0~wφ~0和转移自由能ΔG_(tr)~(0,w→0)。对于不同钒数的杂多阴离子,其半波电位E_(1/2)与pH关系均可用E_(1/2)=A-37pH(mV)描述。

普鲁卡因在水/硝基苯界面的转移

本文用循环线扫电流计时电位(CLC)法及循环伏安(CV)法研究了局部麻醉药普鲁卡因在水/硝基苯界面的转移行为,同时根据转移电位和电流表达式计算出质子化普鲁卡因的标准转移电位,⊿_O~Wφ·转移自由能⊿G_(tr)~(OiW·O)和两相的分配系数及扩散系数。

六甲基二硅氧烷的等离子体聚合及聚合物的结构与性能

在外部电容耦合的辉光放电中进行了六甲基二硅氧烷的聚合。考察了压力、功率以及等离子气体对聚合速率、产物结构和性能的影响。应用IR、XPS、PGC/MS和元素分析等对聚合物的结构进行表征,用TR、热失重、接触角和密度等方法,分别测定了聚合物的热稳定性、疏水性和比重。

Simultaneous determination of four phases of copper in geological samples

According to the specific property of respective phases in copper ore, optimal extracting condition for, tour phases of copper with five infusion was examined. After a series of experiments, for example, different weight Of sample, artificial mixed single phases sample and repeated experiment, the extracting ratio constants foil all phases in different infusions were obtained. The mathematical model which is on the basis of the stable extracting constant is established. Based on the purpose-control genetic algorithms, we only need to determine the total copper in the sample in different infusions under the selected condition, then the value of respective phase could be calculated. The-relative standard deviation are (%) free oxidized copper phase:1.5, conjunction oxidized copper phase: 17.6,, secondary copper sulfide phase: 1.9, primary copper sulfide phase : 2.7,total copper: 0.8.