铁邻菲咯啉、8-羟基喹啉配合物/Y型分子筛的制备、表征及催化苯酚羟化的研究

制备了铁邻菲咯啉、8-羟基喹啉配合物/Y型分子筛(简记为FePhen/Y,FeO_x/Y).用元素分析,TG-DTA,UV-Vis,IR,SEM,BET,及XRD等方法确定了分子筛笼中金属配合物的生成及其晶体结构,考察了实验参数对苯酚转化率及产物选择性的影响.

SYNTHESIS AND CHARACTERIZATION OF POLYACRYLATES CONTAINING CHARGE-TRANSFER GROUPS

Polyacrylates containing para-nitro azobenzene have been synthesized by free radical polymerization. The influence of the length of the spacer of the homopolyacrylates (HPn, n=3,4,6), content of methyl acrylate in the copolyacrylates (CP6) with para-nitro azobenzene groups on the thermal properties, such as liquid crystallinity, Tg and Tm, was studied by DSC, WAXD and polarized optical microscopy. Among the polymers studied, only the homopolyacrylate (HP6)with six carbon atoms in the spacer exhibited a nematic phase. The second-harmonic generation (SHG) signal of the poled HP6 film was detected qualitatively by Maker-fringer method.

STUDIES ON PREPARATION OF IRON, COBALT AND COPPER PHTHALOCYANINES Y ZEOLITE - CHARACTERIZATION AND THEIR CATALYSIS FOR HYDROXYLATION OF PHENOL

Iron, cobalt and copper phthalocyanines/Y zeolite, denoted as FePcY, CoPcY and CuPcY respectively,were prepared. The formation of metal phthalocyanine compounds within the cages of Y zeolite and their crystal structures were determined by elementary analyses, IR, UV-Vis, TG, BET, and XRD methods; The influence of experimental parameters upon phenol conversion and product selectivities was investigated as well.

SYNTHESIS AND CHARACTERIZATION OF CROSS-LINKED 2ND-ORDER NONLINEAR-OPTICAL POLYMER

The present paper reports the synthesis of glycidyl monoether of 4-[(p-nitrophenyl) azo] phenol (GMNA) and crosslinking reaction of GMNA with hexamethylene diisocyanate biuret (HDIB). The Tg of crosslinked polymer was investigated by DSC. The orientation and stability of the poled and crosslinked polymer film were studied by UV-Vis spectra and Maker fringe method.

THERMAL BEHAVIORS OF INTRINSIC POLYANILINE AND ITS DERIVATIVES

Thermal properties of polyaniline (PAn), polytoluidine(POT) and polyanisidine(PAs) were examined by TG and DSC techniques. The weight-uptake of POT at 200-300 degrees C was observed and carefully discussed.

THERMAL BEHAVIORS OF DOPED POLYANILINE

Thermal behavior of polyaniline(PAn) doped with kinds of inorganic or organic acids under desired atmosphere were studied by TG,DSC and in-situ electrical conductivity measurements. The reason for the thermal stability of electrical conductivity of doped PAn was discussed.

THERMAL-ANALYSIS OF Y1-XCAXBA2CU3O7-Y

TG and DTA analysis of Y1-xCaxBa2Cu3O7-y suggests that the stability of the 123 phase increases with increasing Ca contents. The O(1) in the Cu(1)-O chain is unstable but O(2) and O(3) in Cu(2)-O planes are very stable. There are hardly any oxygen vacanci

PC/ABS BLENDS:COMPATIBILIZATION AND MECHANICAL-BEHAVIOR

PC/ABS(M) blends, encompassing the whole composition range between pure PC and ABS(M), were prepared by melt-mixing in a Brabender-like apparatus. Thermal, mechanical and impact tests were performed on compression moulded specimens. Inward Tg shifts were

水溶性聚合物和两亲聚合物 16.聚苯乙烯/聚丙烯酰胺嵌段聚合物的合成和表征

采用聚偶氮酯引发剂,合成了聚苯乙烯/聚丙烯酰胺嵌段聚合物(PSt/PAM)。考察了含偶氮基聚苯乙烯预聚物(pre-PSt)在1,4-二氧六环中引发AM的聚合反应行为,讨论了影响第二单体转化率和聚苯乙烯均聚物含量的因素。用元素分析、溶解性、红外光谱、DSC、TG和裂解色谱表征了PSt/PAM嵌段聚合物。

间硝基苯甲酸稀土配合物的热分解

用TG-DTA,高温X-射线衍射研究了稀土间硝基苯甲酸配合物LnL_3·nH_2O(n=2,Ln=La→Lu+Y;n=0,Ln=Sc,HL=间硝基苯甲酸)的热分解行为,DSC测定其脱水相变过程中的热力学函数,同时用透射电镜观察了热分解产物的超微性。

结晶十六烷基三甲基溴化铵烷基链构象的红外光谱研究

在290-400K的温度范围内用红外光谱法在分子水平上考察了结晶十六烷基三甲基溴化铵的分子链构象随温度的变化。结果表明:在343K以下分子烷基链主要以全反式构象相互平行排列,仅在链末端有少量TG式构象存在;当温度高于343K时,分子链中有GTG′式构象出现且链间相互作用开始减弱,但分子链轴仍保持相互平行排列;当温度高于373K时,TG和GTG′式构象数量显著增加,同时GTG和GG式构象大量出现,烷基链轴的线性结构被破坏且分子链间相互作用变得很弱。

ELECTROCHEMICAL-BEHAVIOR OF N-METHYL-N'-HEXADECYLVIOLOGEN MONOLAYERS ON SILVER ELECTRODES - EFFECTS OF COUNTERIONS

N-Methyl-N'-hexadecylviologen (C16MV) has been the subject of several electrochemical and spectroelectrochemical studies which characterized the species present in various redox states for C16MV monolayers on silver electrode surfaces. Both self-assembled monolayers (SA) and Langmuir-Blodgett (LB) transferred systems have been studied. These indicated inconsistencies regarding the presence or absence of splitting of the first reduction peak in its cyclic voltammogram (CV). The present study demonstrates the important influence of the specific anionic species present in the supporting electrolyte. Splitting may or may not take place, depending on the size and relative strength of the adsorption of specific anions contributed by the supporting electrolyte. Small, strongly adsorbing anions such as iodide produced peak splitting in the CV of C16MV monolayers; bulky but weakly adsorbing anions such as perchlorate may disrupt the ordered structure of monolayers but produce no splitting. Ancillary data provided by surface enhanced Raman spectroscopy (SERS) was consistent with the electrochemical measurements.

THERMAL ANALYSIS AND INFRARED SPECTRA OF DIALKYLAMMONIUM TETRAC HLOROCUPRATE

The thermal stability and the solid solid phase transitions in Ills compounds with n = 7-12 have been studied by DSC and TG methods. Comparision with CnZn compounds want made. The nature of three phases of CnCu has been discussed in terms of infrared spectroscopy and the assignment of the phase transitions has been given. The thermal stability of CnCu is lower than that of CnZn and presents an obvious odd even effect. All of these compounds exhibit two solid solid phase transitions in the temperature range of 248-337 K. The peak tempe nature of phase transitions changes regularly. The peak temperature or the main phase transition increases with the chain length. The total transition enthalpies and entropies increase with increasing chain length. When n <= 9, the high temperature phase exists in a partial disorder state. When n >= 10, the high temperature phase exists in a conformational disorder state. The main phase transition and the phase transition at 307.7 K of CnCu may mainly are from the change of the packing structure and the change of the partial conformational order-disorder of alkyl chain, respectively.

对-(二乙氨基)苯基锗倍半氧化物的合成及对体外培养癌细胞的作用

β-羧乙基锗倍半氧化物(Ge-132)的无毒广谱抗癌作用以及潜在的治疗艾滋病的功能~[1～3]促进了Ge-132及其衍生物合成及生物活性研究~[4～6],而对锗原子直接与苯环及其衍生物连接的有机锗倍半氧化物的研究则相对较少.我们曾报道了~[7]p-(二甲氨基)苯基锗倍半氧化物的合成、结构及对癌细胞的作用,p-(二乙氨基)苯基锗倍半氧化物的研究尚未见报道.本文采用改进的方法合成了p-(二乙氨基)苯基锗倍半氧化物(Ge-164).通过元素分析、IP、XPS和TG-DTA确定了组成和结构,观察了它对体外培养人乳腺癌细胞有丝分裂的影响.

月桂胺盐酸盐结构相变机理的红外光谱研究

月桂胺盐酸盐晶体的红外光谱研究表明,标题化合物两个结构相变的起始温度分别为327和339K。在327K以下晶体中分子以TT构象存在并以分子链相互平行的叉指状形式填充,339K以上分子以TG构象和部分GTG'构象存在并以非叉指状的六方形式填充,在327～339K之间则是一个分子构象由有序到无序、链填充由叉指状到非叉指状转变的中间过渡相。