Synthesis and characterization of polyepichlorohydrin-based copolymers with biphenyl groups attached thioether unit

Three novel copolymers,poly[1-(4-(benzothiazole-2-thio-alkyloxy)-biphenyl-4'-oxy)2.3-epoxypropane]s,were synthesized by the reaction of polyepichlorohydrin with obtained monomers,4-(benzothiazole-2-thio-alkyloxy)biphenyl-4'-ols,in which the number of methylene unit in substitution group of biphenyl group was 2,4,6,respectively.The structures of obtained compounds were confirmed by elemental analysis and 1H NMR.The decomposition temperatures of copolymers were near 340 ℃.Differential scanning calorimetry(DSC) measurement and polarized optical microscopy(POM) observation showed the resulting copolymers did not exhibit thermotropic liquid crystalline mesomophism and belonged to semi-crystalline substance.     

Synthesis and characterization of soluble aromatic azopolyamides containing sulfone and ether units

A series of new polyamides 3a–d containing aryl-azo, ether and sulfone groups in the main chain were synthesized from bis[4-(4-aminophenoxy)phenyl sulfone] 1 and several azo aromatic diacyl chlorides 2a–d by the low temperature solution polycondensation technique. FTIR spectroscopy, nuclear magnetic resonance (NMR) and elemental analyses confirmed the structure of these polymers. Owing to the aryl and amide groups in the main chain, these polymers exhibit photochromic properties as well as excellent thermal stabilities. The transition temperatures (T _g) are between 242 and 265 °C, and the char yields at 800 °C in nitrogen atmosphere were above 39%. Based on incorporation of flexible ether linkages and polar sulfone groups, the polyamides show desirable solubility in organic solvents such as DMAc, N,N-dimethylformamide (DMF), N-methyl-2-pyrroidinone (NMP) and dimethylsulfoxide (DMSO). And it is exemplified that polyamide containing 2 and 2′ substitutes performed better solubility. Funded by the National Natural Science Foundation of China (No. 50572081)     

结构可控PBMA-b-PSt嵌段共聚物的合成及结构表征

原子转移自由基聚合（ATRP）方法是一种新发展起来的可控／“活性”自由基聚合方法，在合成结构可控共聚物过程中具有广泛应用。采用二步加料方式的ATRP方法合成了一系列具有可控结构的PBMA－b-PSt嵌段共聚物，聚合物的分子量分布小于1.5,分子量可简单地通过改变反应投料单体／引发剂比及控制单体转化率得到调控，同时对嵌段共聚物的结构进行了IR，^1H-NMR,PGC,DSC表征，确证了其结构。结果表明，所合成的嵌段共聚物具有PBMA－b－PSt－X和PSt-b-PBMA-X的结构特征。     

Synthesis and characterization of phase change memory cells

Phase change memory (PCM) cells based on Ge₂Sb₂Te₅ were synthesized and investigated. Current-voltage measurements demonstrated different final resistances. Transmission electron microscopy (TEM), high resolution electron microscopy (HREM) and the energy dispersive X-ray spectroscopy (EDS) analyses were used to characterize the microstructures of the PCM cells. The architectures, structures and defects in the cells including the deposited elemental distributions and the interfacial structures between electrodes and barrier layers were studied in detail. Supported by the National Basic Research Program of China (Grant No. 2007CB935400), Key Project of Beijing Education Committee Program (Grant No. JB102001200801) and Program for New Century Excellent Talents in University (Grant No. 05009015200701)     

Sb2S3纳米线合成和表征

一维半导体纳米材料是目前科学界的研究热点,Sb2S3具有很高的光敏性能和热电性能,在光电和太阳能应用方面具有很好的潜质.本文通过简单的水热法合成出了大量的Sb2S3单晶纳米线,纳米线直径约为60nm,长度达到几个毫米.用系列复杂的分析测试手段,包括X射线粉末衍射,高分辨像,和选区电子衍射等对纳米线的晶体结构进行了表征,结果显示Sb2S3纳米线属于单一的Sb2S3正交相.紫外-可见光吸收光谱实验显示纳米线能带宽度大约是1.5eV.     

新型含二氮杂萘酮结构聚合物的合成与表征

合成了两个新型杂环二胺单体 :1 ,2二氢 2 (4胺基苯基 ) 4 [4(4氨基苯氧基 )苯基 ](2 H)二氮杂萘 1酮和 1 ,2二氢 2 (4胺基苯基 ) 4 [4(4氨基苯氧基 ) 3,5二甲基苯基 ](2 H)二氮杂萘 1酮 ,并且以Yamazaki体系与不同芳香二酸聚合得到一系列新型含二氮杂萘酮结构聚芳醚酰胺 ,以 FT IR和 NMR表征了聚合物结构 ,新型聚合物的特性粘度在 1 .1 6～ 1 .6 7d L/g,玻璃化转变温度在 2 91～ 32 9℃ ,新型聚合物均易于溶解在极性非质子溶剂中 .     

新型含二氮杂萘酮结构聚合物的合成与表征

合成了两个新型杂环二胺单体:1,2二氢2(4胺基苯基)4[4(4氨基苯氧基) 苯基](2H)二氮杂萘1酮和1,2二氢2(4胺基苯基)4[4(4氨基苯氧基)3,5二甲基苯基](2H)二氮杂萘1酮,并且以Yamazaki体系与不同芳香二酸聚合得到一系列新型含二氮杂萘酮结构聚芳醚酰胺,以FTIR和NMR表征了聚合物结构,新型聚合物的特性粘度在1.16～1.67 dL/g,玻璃化转变温度在291～329℃,新型聚合物均易于溶解在极性非质子溶剂中.     

纳米结构聚苯胺的合成及性质

结合最新研究现状,简述了纳米结构聚苯胺的结构、掺杂特点及性质,并详细介绍了具有纳米结构聚苯胺的合成方法.采用化学合成和电化学合成方法均可成功制备纳米级导电聚苯胺粒子.化学合成法主要包括各种软、硬模板法以及非模板合成法.值得指出的是非模板合成法中的界面聚合法及快速混合反应法是获得大量的、形貌及尺寸可控的、高品质纳米结构聚苯胺的简易新方法.     

Synthesis and Characterization of Novel Polyarylene Sulfide

A novel polyarylene sulfide, polyarylene sulfide sulfone imide, was polymerized with a new monomer （Dichlorodiimide） and sodium sulfide by taking high temperature （200℃） N-methyl-2-pyrrolidinone （NMP） as solvent. The polymer was characterized by using conventional methods. Physical properties of the polymer, including thermal stability and solubility, were also studied. DSC and TG analyses reveal that the glass transition temperature T is equal to 252.4 ℃ and that the thermal decomposition temperature Td is equal to 484.9℃.     

杂多酸三聚氰胺荷移盐的合成与表征

合成了一种新型杂多酸荷移盐(C3N5H4NH3)3PW12O40,并用元素分析、红外光谱、紫外光谱对其进行表征.对该化合物的结构分析表明这些化合物中的多阴离子仍保留着其Keggin结构,但其特征振动谱带有一定的红移或蓝移.结果表明在配体和受体之间存在着很强的相互作用和电荷转移.形成电荷转移盐之后的杂多阴离子是一个独立的单元,它通过静电引力与C3N5H4NH3+作用,仍保持Keggin骨架结构.     

新型含磷热致液晶共聚酯的合成与表征

采用溶液法合成了一种新型含磷热致液晶共聚酯,使液晶共聚酯的主链上含有介晶单元,侧基上含有阻燃元素磷.利用红外光谱方法对合成的共聚酯的结构进行了分析,利用乌氏黏度计对共聚酯的特性黏度进行了测定,并对共聚酯进行液晶结构分析及广角X射线衍射(WAXD)、热失重分析(TG)等测试.结果表明,共聚酯具有热致液晶性,其液晶织构为向...     

12-钼锗酸哌啶荷移盐的合成与表征

以α-GeMo12O40为原料与哌啶在乙腈与水的混合溶剂中,合成了一种组成为[(CH2)5NH2]4[GeMo12O40]的荷移盐,并用元素分析、紫外光谱和红外光谱等手段对其进行了表征.对荷移盐的结构分析表明化合物中的多阴离子仍保留着其Keggin结构,但其特征振动谱带有一定的红移或蓝移,表明在配体和受体之间存在着很强的相互作用和电荷转移.     

一种疏水缔合水溶性聚合物的合成及性能评价

采用氧化还原体系合成了AM/AMPS/C16DMAAC共聚物.考察了不同条件对共聚物特性粘数和转化率的影响,得到最佳的反应条件范围,并研究了浓度、温度、盐及剪切速率对聚合物表观粘度的影响.     

Synthesis and characterization of pure mesoporous zirconia thin film with two-dimensional hexagonal framework

Sincethediscoveryofanewfamilyofsilica basedmesoporousmaterialsdesignatedasM41Sbyresearchers atMobilOilCorporationin1992[1,2],avarietyofmeso porousmaterialshavebeenpreparedusingstructure di rectingagents,suchasionicornonionicsurfactants,as templates[3-9].M…     

添加碳酸乙烯酯的丙烯腈-丙烯酸甲酯共聚物的结构与性能

在丙烯腈（AN）与丙烯酸甲酯（MA）的水相沉淀聚合过程中添加质量分数为5％～30％的碳酸乙烯酯（EC），合成含有EC的丙烯腈基共聚物．采用傅立叶变换红外光谱（FTIR）、差示扫描量热仪（DSC）、热重分析（DTG）和X射线衍射分析（XRD）等方法对聚合产物进行了分析．结果表明，EC几乎不参与两单体的自由基聚合，而仅作为一种独立成分存在于丙烯腈基聚合物的分子链中；随着EC含量的增加，共聚物的分解温度先升高后降低，而聚合物的熔融温度逐渐降低；聚合物的结晶度也随着EC含量的增加而呈现出降低的趋势．     

Microstructural characterization and mechanical properties of self-reinforced Si3N4 ceramics containing high oxynitride glass

Self-reinforced Si3N4 ceramics containing high oxynitride glass have been fabricated by the control of microstructure evolution and β-SiaN4 grain growth. The effects of the size distribution of the elongated β-Si3N4 grains, and the β-SiaN4 grain growth as well as the oxynitride glass chemical characteristic on the microstructure and mechanical properties were investigated. The experimental results show that the β-Si3N4 grains in high oxynitride glass grow to elongated rod-like crystals and form the stereo-network structure. Under the sintering conditions of 1800℃ and 60 rain, a quite uniform microstructure with an average aspect ratio of 6.5 and an average of 1 I.tm can be obtained. A large amount of oxynitride glass phase with high nitrogen content enhances the elevated temperature fracture toughness because of its high softening temperature and high viscosity. In the present material, the crack deflection and pullout of the elongated rod-like β-SiN4 grains are the primary toughening mechanisms.     

Synthesis and characterization of Pt-MoOx-TiO2 electrodes for direct ethanol fuel cells

To enhance the CO-tolerance performance of anode catalysts for direct ethanol fuel cells,carbon nanotubes were modified by titanium dioxide(donated as CNTs@TiO2)and subsequently served as the support for the preparation of Pt/CNTs@TiO2 and Pt-Mo/CNTs@TiO2 electrocatalysts via a UV-photoreduction method.The physicochemical characterizations of the catalysts were carried out by using X-ray diffraction(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),and infrared spectroscopy of adsorbed probe ammonia molecules.The electrocatalytic properties of the catalysts for methanol oxidation were investigated by the cyclic voltammetry technique.The results show that Pt-Mo/CNTs@TiO2 electrode exhibits the highest performance in all the electrodes.It is explained that,the structure,the oxidation states,and the acid-base properties of the catalysts are influenced due to the strong interaction between Ti and Mo species by adding TiO2 and MoOx to the Pt-based catalysts.     

Synthesis,characterization and electrochemical recognition of metal ions of three new ferrocenyl derivatives containing pyridyl moiety

Three new ferrocene （Fc） based receptors with pyridyl moiety, named methyl-6- ferrocenoylacetyl-2-pyridine carboxylate （FcLl）, 1,1＇-（2,6-bispyridyl）bis-3-ferrocenyl-l,3-propanedione （FcL2）, ferrocenecarboxaldehyde-2,6-dipicolinoyhydrazone （FcL3） were synthesized, and further characterized by elemental analysis, IR spectra, UV-Vis spectra, 1H and 13C NMR. The electrochemical properties and ion sensing properties of FcL1, FcL2 and FcL3 were also investigated by means of cyclic voltammetry in ethanol solution with 0.1 mol/L LiC104 as the supporting electrolyte. The E~ values of the receptors increase with the scanning rate increasing at high scanning rate, and Ipa/Ipo approaches unity, indicating that the redox reaction is basically reversible. Their recognition performances to different metal cations such as Cd（II）, Co（II）, Cu（II）, Hg（II）, Mn（II）, Ni（II）, Zn（II） show that the FcL1 is responsive to Cu（II） with the maximum electrochemical shift of the FcL1 for Cu（II）of about 72.0 mV, whereas the FcL2 is responsive to Cu（II） and Mn（II） with shift of 102 mV and 109 mV, respectively, and the FcL3 is responsive to Hg（II） and Mn（II） with the shift of 53.0 mV and 54.0 mV, respectively. All the results show that these receptors may have potential applications in electrochemical sensor technology, material science, and molecular devices.     

用于质子交换膜的三个苯环磺化聚芳醚的合成

合成一种含三个苯环的新型磺化聚芳醚.采用特殊单体结构的设计,在聚合物主链上引入甲基取代基对主链进行保护.用氯磺酸直接磺化方法在聚芳醚高分子侧基上引入磺酸功能基,实现了聚合物磺化结构的可控定位合成,得到了磺酸基在侧链上的磺化聚芳醚.通过核磁共振(1H-NMR)、凝胶渗透色谱(GPC)和元素分析(EA)等方法,对其结构进行表征.     

Synthesis and ceramization of polycarbosilane containing beryllium简

Polycarbosilane containing beryllium （BPCS） precursors was prepared by the reaction of polycarbosilane （PCS） with beryllium acetylacetone （Be （acac）2）. The analysis of structures and components of BPCS demonstrates that their main structures are basically the same as PCS. Ceramization of BPCS precursors shows that BPCS precursors are organic below 600 °C and inorganic at 800 °C. At 1400 °C, BPCS precursors convert into silicon carbide ceramics. The ceramization of different beryllium content precursors were studied, which show that beryllium plays an important role in the inhibition of crystalline grain growth of β-SiC at high temperature and it can adjust the dielectric constant of silicon carbide ceramics.