共查询到19条相似文献,搜索用时 93 毫秒
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研究了两亲配体2-十二烷基丙二酸二(8-氨基喹啉)酰胺(H2A)的UV-Vis光谱和荧光光谱。铜离子对配体的荧光有明显的猝灭作用。研究了H2A及其与铜的两类配合物的单分子成膜性能和LB膜的俄歇电子能谱。CuA的成膜性能明显比H2A好,俄歇电子能谱表明H2A单分子膜在膜/水界面与亚相Cu2+生成了1∶1的配合物。H2A的LB膜可以用作为Cu2+离子的传感材料,线性范围为0.1~1.0μmol/L。 相似文献
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双端8-羟基喹啉配体的合成与表征 总被引:2,自引:0,他引:2
设计了以8-羟基喹啉为原料,经过氯甲基化后分别与哌嗪、十二胺、癸二醇反应,合成了3种端基为8-羟基喹啉的双端配体,即N,N'-双(8-羟基喹啉基5-亚甲基)哌嗪、N,N-双(8-羟基喹啉基5-亚甲基)十二胺、O,O'-双(8-羟基喹啉基-5-亚甲氧基)癸烷.通过元素分析、核磁共振谱对3种化合物的组成和结构进行了表征. 相似文献
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合成了碘取代的含偶氮基席夫碱类标题化合物(p—IPSAQ)。通过IR、^1HNMR确证了产物结构。考察了其理化性质.初步测试了其荧光性能。 相似文献
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报道了新试剂5—(4—硝基苯偶氮)—8—(苯磺酰氨基)喹啉(NPBSQ)的合成及其与铜的显色反应。在pH=9.2的硼砂缓冲溶液中,Tween80存在下,NPBSQ与铜形成一种紫红色络合物,最大吸收波长为610nm,摩尔吸光系数=5.1×104L·mol-1·cm-1,铜含量在0~20μg/25ml范围内服从比尔定理,在掩蔽剂存在下,该方法己用于实际样品中铜的测定。 相似文献
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合成了新试剂糠醛缩7-氨基-8-羟基喹啉-5-磺酸(简称F7N8Q5S)。试剂在酸性介质中被KBrO3氧化分解,生成强荧光物质,V(Ⅴ)对该反应具有强烈的催化作用,由此建立了测定痕量钒的催化荧光法。反应在酸性介质中进行,0.05%F7N8Q5S3.0mL,5%KBrO30.6mL,沸水浴中加热20min,λex/λem=326nm/386nm。钒的量在0.0~4.8μg/L范围内呈线性,检测限为0.4μg/L。该方法用于实际样品中痕量钒的测定,结果满意。此外还详细研究了反应机理。 相似文献
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以对苯二甲酸二酯与对苯二胺为原料,氢化钠为催化剂,合成了一种芳香性二酰胺二胺化合物.与其他对苯二甲酸二酯相比,对苯二甲酸二甲酯在40℃下有较高的活性,和对苯二胺反应生成N,N'-双(对氨基苯基)对苯二甲酰胺的产率在60%以上.反应产物的结构分别用元素分析,IR和1HNMR进行了表征. 相似文献
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一种新型两亲性聚合物的合成研究 总被引:1,自引:0,他引:1
合成了一种新型的两亲性共聚物(丙烯酰胺/醋酸乙烯酯/丙烯酸丁酯,AM/VAc/BA),探讨了在该共聚物合成过程中AM用量和VAc与BA的配比对其表面张力、离心稳定性、乳化性及发泡力的影响,并对该三元共聚物P(AM/VAc/BA)的结构进行表征。结果表明,傅立叶红外光谱(FT-IR)分析在1 680 cm-1~1 620 cm-1处无C=C伸缩振动吸收峰出现,说明体系反应较彻底;差示扫描量热(DSC)分析得共聚物的玻璃化转变温度为37.6℃。 相似文献
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基于原子转移自由基聚合(ATRP)机理,以二甲基一氯硅烷封端的烯丙基-聚乙二醇为起始剂,甲基丙烯酸乙酯(EMA)为单体,通过控制反应温度,合成了一系列聚合度(DP_(NMR))分别为0. 74,1. 67和3. 07的新型对称性两亲含硅共聚物(PEMA-b-Si-PEG-Si-b-PEMA),并评价了该共聚物在氯仿/水界面的界面活性和吸附行为。结果表明:该类聚合物可以有效降低氯仿/水界面张力,具有最短PEMA链的聚合物可将氯仿/水界面张力从32 m N/m降低至约23 m N/m。动态界面张力分析表明:低浓度的共聚物在吸附的初始阶段符合扩散控制,且较短的PEMA链段有利于产生较快的扩散速率。平衡界面张力分析表明:随着界面浓度的增加,共聚物将表现出多种吸附状态,其吸附状态的数量以及聚合物在界面的偏摩尔面积将随着PEMA链长度的增加而增加。 相似文献
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Xue‐Yong Liu Xiao‐Bin Ding Zhao‐Hui Zheng Yu‐Xing Peng Xin‐Ping Long Xiao‐Chuan Wang Albert S. C. Chan C. W. Yip 《应用聚合物科学杂志》2003,90(7):1879-1884
Novel magnetic polymer microspheres with amphiphilic structure ranging in diameter from 5 to 80 μm were prepared by dispersion copolymerization of styrene and poly(ethylene oxide) acrylamide macromonomer (MPEO) in the presence of Fe3O4 magnetic fluid. The effects of various polymerization parameters on the average particle size were systematically investigated. The average particle size was found to increase with increasing initiator concentration. It also increased with decreasing stabilizer concentration and MPEO concentration. The content of the amino groups localized in the microspheres ranged from 0.01 to 0.25 mmol/g. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1879–1884, 2003 相似文献
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An amphiphilic copolymer of acrylic acid (AA) and 2,2,2‐trifluoroethyl methacrylate (TFEMA) was synthesized by reversible addition‐fragmentation transfer (RAFT) copolymerization, using a feed method for adding TFEMA. The kinetics of the RAFT copolymerization agreed well with those characteristic of a first‐order reaction and the molecular weight of copolymers increased with the conversion increasing, both demonstrating that it proceeded in a controlled polymerization manner. Optimal copolymerization was achieved when the reaction was conducted at 70°C, using a molar ratio of TFEMA : AA : RAFT agent : initiator of 400 : 400 : 4 : 1. Analysis of instantaneous 1H‐NMR results proved that the obtained copolymer had a chain structure with AA segments gradually changing to TFEMA segments. The copolymer films had lower surface free energies and slightly microphase separation structures. The amphiphilic copolymer with gradient structures could self‐assemble to form aggregates in selective solvents. The type and composition of solvent mixtures had great effects on the morphology and sizes of aggregates, which were investigated by transmission electron microscopy and dynamic light scattering, respectively. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci., 2013 相似文献
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A novel free radical interfacial copolymerization was proposed and used to prepare the amphiphilic block copolymer of acrylamide (AM) with styrene (S). In this copolymerization, a synthesized new kind of initiator, namely, amphiphilic bifunctional initiator, which has not only a hydrophilic and a hydrophobic group but also two functional groups generating radicals in both ends of its molecule, was used to initiate the interfacial copolymerization. The generated amphiphilic block copolymer was characterized by infrared analysis, differential scanning calorimetry, elemental analysis, and dissolution behavior. The migration of generated copolymer from interface to water phase was discussed. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 443–449, 1998 相似文献
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Amphiphilic copolymers of ethyl acrylate (EA) with uniform polyoxyethylene (PEO) grafts were synthesized by copolymerization of EA with methacrylate terminated PEO macromer in benzene using azobisisobutyronitrile as the initiator. The effects of the molecular weight of the macromers, the charging weight ratio of the macromer to EA, the total monomer concentration, and the amount of initiator on the grafting efficiency (GE) were reported as was the molecular weight of the copolymers. The highest GE reached to above 90% and the molecular weight of the copolymers varied from (5–15) × 104. The reactivity ratio of EA with the macromer was determined to be 0.83. The graft copolymers were purified with extractions and the purified products were characterized with IR, 1H‐NMR, gel permeation chromatography, differential scanning calorimetry, and membrane osmometry. The average grafting number of the copolymer varied from 2 to 11. The glass‐transition temperature of the poly(EA) in the copolymer was increased because of the partial compatibility of the two components. The crystalline property, emulsifying property, and dilute solution viscosity of the graft copolymers, as well as ionic conductivity of their complexes with alkali metal salts, were studied. The emulsifying volume decreased with the increasing molecular weight of the PEO grafts. The addition of NaOH to the emulsion affected the emulsifying volume only slightly, whereas the addition of HCl changed the oil in water type emulsion into a water in oil type. The conductivity of the LiClO4 complex of the copolymer with an oxyethylene/Li ratio of 20 reached 3.7 × 10?5 S/cm at 27°C. The lower the crystallinity of the complex, the higher was the conductivity. The dilute solution viscosity showed the existence of intramolecular microphase separation. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 903–912, 2001 相似文献
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以非离子单体丙烯酰胺(AM)、阴离子单体2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和阳离子单体二甲基二烯丙基氯化铵(DMDAAC)为原料,以过硫酸铵、亚硫酸钠、2,2'-偶氮二异丁基脒二盐酸盐为引发荆,合成了絮凝剂产品PAM/AMPS/DMDAAC.在单体质量分数为10%的条件下,得到了最佳的合成工艺为:m(AM):m(DMDAAC):m(AMPS)=7:2:1,反应温度为45℃,偶氮引发剂2,2'-偶氮二异丁基脒二盐酸盐用量为溶液质量分数的0.006%,过硫酸铵用量为溶液质量分数的0.004%,哑硫酸氢钠用量为溶液质量分数的0.002%;对PAM/AMPS/DMDAAC的结构进行红外光谱和透射电镜表征,表明PAM/AMPS/DMDAAC链节上含有季铵盐和磺酸盐基团,分子呈现长链结构,分子链刚性好,交联现象少. 相似文献
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简要介绍了环蕃的结构特征、性质及应用,详细综述了:①新型超分子大环配体环蕃的合成及应用;②新型环蕃的合成及选择性识别作用;③新型手性环蕃的合成及应用。 相似文献