Synthesis and characterization on semi-aromatic polyamide containing benzoxazole unit

In order to obtain a novel polyamide having excellent heat-resistant properties which could be anticipated as a thermal modifier for aliphatic polyamide,a series of new semi-aromatic polyamides (BO6,BO8,BO10) containing benzoxazole unit were synthesized based on 5-amino-2-(p-aminophenyl) benzoxazole (ABO) and aliphatic acids (adipic,suberic and sebacic acid) by means of Yamazaki phosphorylation method.The effect of reaction temperature on the inherent viscosity of the polymers was studied,and the structures of products were characterized by FTIR,1 H-NMR,and the heat resistance of the polymers was studied by DSC and TG.The results showed that the reaction temperature gives the polymers the highest viscosity at around 90 ℃,130 ℃ and 130 ℃ for BO6,BO8 and BO10,respectively.The heat resistance of the new semi-aromatic polyamides is much higher than that of the common aliphatic polyamides.In addition,the products show good solvent resistance and crystallization properties.     

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。     

共轭导电聚合物的特性及应用

目的　介绍共轭导电聚合物的特性及应用 .方法　根据共轭导电聚合物的特性 ,介绍了与其特性相关的应用 .结果　共轭导电聚合物在制作二次电池、新型电子器件等方面具有独特的特性和优点 .　结论共轭导电聚合物是一种极有应用前景的功能高分子材料     

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)     

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.     

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 .     

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.     

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.     

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.     

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℃.     

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…     

新型金刚石薄膜场电子发射的特性

介绍了用微波CVD法制备的一种新型低阈值电压大电流密度金刚石薄膜场发射冷阴极,阈值电压低于1.09 V/μm,场发射电流密度高达418 mA/cm²,这是目前文献中报道的最好结果之一.文中还探讨了金刚石薄膜场电子发射机制.     

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．     

聚3,4-二辛氧基噻吩的制备及电致变色性能研究

采用亲核取代和醚交换反应合成了双烷氧基取代噻吩,并由电化学氧化聚合方法制备了能溶于一般有机溶剂的共轭聚合物——聚3,4-二辛氧基噻吩。用红外光谱、核磁共振氢谱、紫外可见光谱、循环伏安法、光谱电化学法等测试手段和方法研究了聚合物的电化学氧化还原性能和电致变色性能。结果表明：所得聚合物薄膜具有稳定可逆的氧化还原性能和电致变色性能;其氧化还原电位在630～900mV之间,其还原态可见光谱在450～650nm之间出现三重峰特征;聚合物薄膜还原态呈透明紫色,氧化态呈浅蓝色,600nm处最大对比度为18.1％。     

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.