共查询到18条相似文献,搜索用时 78 毫秒
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用偶氮二异丁腈作引发剂,使N-乙烯基咔唑和丙烯酸甲酯在苯中共聚合,该共聚物在四氢呋喃中用氢氧化钠水溶液水解,得到水溶性乙烯基咔唑-丙烯酸共聚物,该共聚物的水溶液在373nm处产生较强的荧光,其荧光强度随液pH值增大而增强,在该高分子水溶液中,加入不少量阳离子表面活性剂,其量子产率可提高7倍。微量重金属离子(Hg^2^+)对荧光有一定的熄灭作用。荧光强度(logIo/I)与Hg^2^+的浓度呈线性关 相似文献
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水溶性荧光高分子乙烯基咔唑-丙烯酸共聚物的合成及荧光测试 总被引:1,自引:0,他引:1
用偶氮二异丁腈作引发剂,使N-乙烯基咔唑和丙烯酸甲酯在苯中共聚合,该共聚物在四氢呋喃中用氢氧化钠水溶液水解,得到水溶性乙烯基咔唑-丙烯酸共聚物。该共聚物的水溶液在373nm处产生较强的荧光,其荧光强度随溶液pH值增大而增强,在该高分子水溶液中,加入少量阳离子表面活性剂,其量子产率可提高7倍,微量重金属离子(Hg(2+))对荧光有一定的熄灭作用。荧光强度(logI0/I)与Hg(2+)的浓度呈线性关系。 相似文献
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本文首次通过共聚方法和功能基化方法合成了芘标记苯乙烯/二乙烯苯共聚物,用稳态荧光光谱、裂解色谱、裂解色谱-质谱等方法对芘标记共聚物进行了详细地表征。结果表明,通过控制芘标记单体的投料或功能基化反应时间,可以将一定量的芘基标记到苯乙烯/二乙烯苯共聚物中,其荧光光谱显示了芘基的单体荧光发射和激基缔合物荧光发射;共聚物裂解色谱的甲基芘峰和苯乙烯三聚体峰反映了芘基和交联聚苯乙烯骨架的特征,据此可建立甲基芘 相似文献
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以4-溴-1,8-萘二甲酸酐和乙二胺为原料,经3步反应合成了一种新型荧光单体——4-甲氧基-N-(2-丙烯酰胺乙基)-1,8-萘二酰亚胺(Ⅲ);Ⅲ与丙烯酸(AA)和马来酸酐(MA)共聚制得新型示踪共聚物AA-MA-Ⅲ(1),其结构经IR,TG-DTA和SEM表征。1的荧光性质和阻垢性能研究结果表明,其荧光强度与质量浓度呈良好线性关系,线性相关系数为0.998 5,检测下限为1.0×10-2mg.L-1;1对碳酸钙垢沉积有较好的抑制作用,当用药量为20 mg.L-1时对碳酸钙阻垢率为93.5%,且具有较好的分散氧化铁的能力;SEM观察表明1对碳酸钙垢既有较强的分散作用又具有明显的晶格畸变作用。 相似文献
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合成了四个三核簇合物[A]2[MS4(CuCN)2](1A=Et4N,M=Mo;2A=PPh4,M=W;3A=Et4N,M=W;4A=PPh4,M=Mo),测定了[Et4N]2[MoS4(CuCN)2]*H2O(1*H2O)和[PPh4]2[WS4(CuCN)2]*0.5DMF*H2O(2*0.5DMF*H2O)的晶体结构.1和2的簇阴离子[MS4(CuCN)2]2-(M=Mo,W)均具有一个双齿配体MS42-和两个CuCN形成的近似D2d对称性结构. 相似文献
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以丙烯酸(AA)为第一配体、邻菲罗啉(Phen)为第二配体、Eu3+为中心离子,合成了一种可聚合的稀土铕配合物.以配合物单体、甲基丙烯酸甲酯、丙烯酰胺和对苯乙烯磺酸钠为共聚单体,通过无皂乳液聚合的方法,制备了含铕荧光共聚物乳液.采用红外光谱对共聚物的结构进行了表征,并探讨了配合物单体含量对共聚物乳液性能的影响.透射电子显微镜(TEM)和激光光散射粒度仪(PCS)测试结果表明,共聚物乳液形成了相对均一的球状结构,但随着配合物单体含量增加,共聚物微球粒径逐渐增大、分散性变差.采用荧光分光光度计测试了共聚物乳液的荧光性能,在594和619 nm处出现Eu3+的特征发射光谱,且荧光强度随着配合物单体含量增加而增强. 相似文献
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含柠檬酸配体的钼硫簇合物的合成与晶体结构的测定 总被引:2,自引:0,他引:2
合成了含有Mo—S簇阴离子 [Mo2 O2 ( μ S) 2 (C6H5O7) (C6H4 O7) ]5-柠檬酸簇合物 ,并通过元素分析、红外光谱、紫外 可见光谱和X射线光电子能谱对配合物进行了表征 ,用X射线衍射法测定了该化合物的晶体结构 .结果表明 ,该簇合物属于单斜晶系 ,空间群P2 1/c,a =2 3 766( 5)nm ,b =1 3 2 74 ( 3 )nm ,c =2 2 4 71 ( 5)nm ,α=γ =90°,β=1 1 8 2 1°,V =6 2 4 7( 2 )nm3 ,Z =8,一致性因子R =0 0 83 1 ,R2 ,w=0 1 536.该簇合物阴离子中每一个Mo原子都采取扭曲的八面体结构 ,柠檬酸通过羟基、α 羧基、一个 β 羧基与Mo配位 .晶体结构表明在一个结晶学上不对称的结构单元内有两个结晶学上独立的分子 . 相似文献
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EAA增容LLDPE/SAN共混物的形态及力学性能 总被引:4,自引:0,他引:4
采用SEM及力学性能测试等方法,研究了乙烯-丙烯酸共聚物(EAA)含量对其增容线性低密度聚乙烯(LLDPE)/苯乙烯-丙烯腈共聚物(SAN)共混物形态及性能的影响.发现少量的EAA可使共混物中SAN相的相尺寸减小,共混物模量、拉伸强度及断裂伸长率提高.当EAA的含量增加至11.7%时,它在共混物中两相界而的分布达到饱和,即增容剂饱和浓度Cs=11.7%;此时,共混物形态及性能的变化趋势出现明显转折.明显过量的EAA主要起增韧作用.EAA的增容机理为,它与LLDPE组分的非晶区可部分相容,同时又与SAN相存在着分子间特殊作用. 相似文献
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博·格日勒图 《高等学校化学学报》1995,16(4):648
制备线型和网状N-乙烯基咔唑-丙烯酸甲酯共聚物后,用三氟乙酸汞分别在四氢呋喃(THF)和二氯甲烷中进行汞化反应,得到相应的线型和网状汞代咔唑共聚物。这些共聚物经THF溶解或溶胀后,用氢氧化钠水溶液水解,得到相应的水溶性线型高分子和吸水性网状高分子,憎水性汞代咔唑共聚物在THF中由I2取代汞;亲水性汞代咔唑共聚物在水溶液中由KI3取代汞。汞代咔唑高分子链在不同溶剂中可以产生不同的形态变化。 相似文献
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含咔唑高分子水溶液的室温磷光 总被引:2,自引:0,他引:2
含咔唑高分子水溶液的室温磷光博日吉汗·格日勒图,印杰(内蒙古师范大学化学系,呼和浩持,010022)(上海交通大学应用化学系)关键词磷光,铊离子,N-乙烯基咔唑-丙烯酸共聚物芳香族化合物吸收辐射后可在室温发射荧光,但芳香族化合物小分子只有在低温(77... 相似文献
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Ayman M. Atta Adlia A. Gaser Zaneib F. Kamel 《Journal of Dispersion Science and Technology》2013,34(11):1456-1464
Copolymers of 2-acrylamido-2-methyl propane sulfonic acid and acrylic acid were crosslinked in the presence of different mol% of either vinyl trimethoxy silane (VTMS) as the crosslinking agent under acidic conditions or N,N-methylenebisacrylamide (MBA) as crosslinker using solution radical polymerization. The resultant xerogels were characterized by extracting the soluble fractions and measuring the equilibrium water content. Soluble fractions of the crosslinked networks were reduced by varying the MBA and VTMS concentrations. The surface morphology of the crosslinked polymers was observed by scanning electron microscope. The influence of pH on the swelling behavior of gels was investigated. The swelling behaviors of the resulting gels show pH sensitivity. 相似文献
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Summary: Low density polyethylene (LDPE) was functionalized with different molar ratios of styrene (St) to acrylic acid (AA) in the presence of dicumyl peroxide (DCP) in the molten state. The resultant LDPE was characterized by gel content and torque analysis. The results showed that the gel content of polymers grafted with small molar ratios (St/AA = 0.5) was always higher than those grafted with the equimolar St/AA ratio. The effect of DCP amount and AA concentration on the grafting degree of AA was investigated. The suitable DCP amount and AA concentration was obtained. Functionalized LDPE [LDPE-g-(AA-St)] was characterized by Fourier transform infrared spectroscopy (FTIR), melt flow rate (MFR), water contact angle and capillary rheometry. The results showed that both MFR and grafting degree of AA of LDPE-g-(AA-St) was the highest when an equimolar AA/St ratio was used, but when mixtures of St and AA (St/AA = 1/10) were loaded, the water contact angle of the film prepared from the LDPE-g-(AA-St) was the smallest, which indicated that the hydrophicity of the film surface not only depended on the grafting degree, but also the molar ratios of the hydrophobic/hydrophilic groups. 相似文献
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Abstract A versatile crosslinking agent, tetraallyl piperazinium dichloride (TAP) has been prepared and demonstrated to be useful in copolymerization with water soluble monomers such as acrylic acid and acrylamide. Although the crosslinker itself does not readily homopolymerize in water, it forms transparent rigid hydrogels within a reasonable period of time when copolymerized with acrylic acid. Being nonhydrolysable, the crosslinker presented is superior to other common water soluble crosslinking agents such as methylene or ethylene bis(acrylamides). Since this crosslinker has a low toxicity, it may be used for bioapplications such as gel electrophoresis etc. 相似文献
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丙烯酸与丙烯酰胺共聚制备高吸水性树脂 总被引:3,自引:0,他引:3
采用溶液聚合法,以N,N’-亚甲基双丙烯酰胺(NMBA)为交联剂,过硫酸钾(KPS)为引发剂合成了高吸水性树脂聚(丙烯酸-丙烯酰胺)(P(AA—AM)),研究了单体配比、丙烯酸中和度、引发剂及交联剂用量、反应温度对树脂在去离子水和0.9%盐水中吸水率的影响.最佳条件下制备的树脂在去离子水中吸水率为750g·g^-1,在0.9%盐水中吸水率为85g·g^-1. 相似文献
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Qiang CHEN Ying GUAN Xian Min ZHANG Yu Xing PENG Jian XU* State Key Laboratory of Polymer Physics & Chemistry Center for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing Chengdu Institute of Organic Chemi 《中国化学快报》2001,(11)
Polymer gels are of considerable interests in material science1-3. Many theoretical and experimental studies have been made on the cross-linking copolymerization4-6 of these systems. Recently, in situ interferometry is applied in studying this process7-9. As shown in Figure 1, the common two-armed cross-linkers will lead to defects in the network, while multi-armed cross-linkers will enhance the integrity of the network. This paper studies the cross-linkers influence on cross-linking and t… 相似文献