共查询到20条相似文献,搜索用时 9 毫秒
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本文探讨了土壤中汞的ICP发射光谱测定法。实验中使用的介质有HCl,HNO_3,H_2SO_4和HClO_4,还原剂是SnCl_O或NaBH_4。通过实验值与推荐值的对照,验证了方法的可靠性。本法灵敏度高,干扰少,动态范围宽。在1%HNO_3溶液中所达到的检测限分别为0.7和0.09ppb。 相似文献
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聚合物共混:Ⅰ.聚合物共混物的制备方法 总被引:4,自引:0,他引:4
本讲主要介绍聚合物共混物的制备方法,其中包括熔融共混、溶液共混、胶乳共混、冷冻干燥共混、接技共聚共混、互穿聚合物网络、就地反应型共混、分子共混等. 相似文献
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制备了一种能固载目标蛋白质, 却没有非特异性蛋白质吸附的高分子涂层. 该涂层是可生物降解的油水两亲性的三嵌段聚合物, 即生物素偶联的聚乙二醇-聚丙交酯-聚赖氨酸共聚物. 将高分子溶解于N,N-二甲基甲酰胺中, 并涂布在预先包被了聚赖氨酸的脱脂玻片基质上, 形成高分子涂层, 在其表面包被一层由明胶和聚N-乙烯基吡咯烷酮组成的封闭剂. 使用酶标免疫分析法, 对高分子涂层表面的生物活性进行评价. 依次将辣根过氧化物酶标记的链亲和素和生物素偶联的小鼠球蛋白抗原和碱性磷酸酯酶标记的马抗小鼠抗体固载在高分子涂层表面上, 通过标记酶与底物作用生色. 分析结果表明, 经过封闭以后, 生物素化的高分子涂层表面能够排斥非特异性的蛋白质; 同时特异性蛋白质之间(如生物素和链亲和素之间、抗原和抗体之间)的相互作用依然保留, 并且固定在表面的蛋白质依然保留其生物活性. 因此生物素化的聚乙二醇-聚丙交酯-聚赖氨酸三嵌段高分子可以作为生物活性材料, 用于蛋白质固载和蛋白质分离及分析. 相似文献
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大粒径磁性高分子微球的制备 总被引:14,自引:0,他引:14
大粒径磁性高分子微球的制备邱广明邱广亮*(内蒙古工业大学电力学院动力系呼和浩特)(内蒙古师范大学生物系呼和浩特010022)关键词高分子磁性微球,苯乙烯,丙烯酸,共聚物,制备1996-11-25收稿,1997-06-11修回内蒙古自然科学基金资助项目... 相似文献
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合成了具有较高荧光量子产率(0.69)和良好光稳定性的可聚合荧光染料单体,该荧光染料的光稳定性高于商品化的染料罗丹明B。 通过氧化还原引发剂引发乳液聚合制备了超细荧光聚合物纳米微球,将染料分子共价连接在聚合物链上。 使用非离子表面活性剂Triton X-100作为乳化剂、甲基丙烯酸甲酯(MMA)作为单体和助乳化剂,制备的超细纳米微球平均粒径为22 nm,而不加MMA时制备出的纳米微球平均粒径在150 nm左右。 由于微球表面带有苄氯基团,为进一步的微球功能化提供了途径。 相似文献
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M. Appley 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(5):847-853
It gives me great pleasure to have this opportunity to welcome you to the Amherst campus ofthe University of Massachusetts. The Graduate School and its Polymer Science and Engineering Program are honored to host this International Colloquium of so distinguished a group of scientists. 相似文献
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Polymer particles coated with hydroxyapatite were prepared by treating Pd0 immobilized polystyrene-co-acrylic acid particles in aqueous CaCl2 and NaH2PO2 solutions. Hydroxyapatite coating took place at neutral to alkaline pH conditions, and the homogeneous growth of the hydroxyapatite layer on the surface of polymer particles was observed at relatively low temperature (30-50 degrees C). The thickness of the hydroxyapatite layer increased with reaction time. Copyright 1999 Academic Press. 相似文献
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热敏性高分子接枝聚苯乙烯微球的制备 总被引:1,自引:0,他引:1
通过使聚N-乙烯基异丁酰胺(PNVIBA)大分子单体与苯乙烯在乙醇/水的混合溶剂中进行自由基分散共聚,得到热敏性PNVIBA接枝聚苯乙烯(PNVIBA-g-PSt)高分子微球。用TEM对微球的形态进行了观察,同时考察了起始PNVIBA大分子单体浓度、苯乙烯浓度、引发剂浓度、聚合温度和混合溶剂中水对微球直径的影响。发现在较宽的聚合反应条件下,得到的接枝高分子颗粒均保持球形并具有单分散性,微球的数均直径(D)与反应条件的关系遵循:D=K[PNVIBA]^-0.39[St]^0.80[I]^-0.14;微球直径随聚合温度的升高和混合溶剂中水含量增加而降低;颗粒形态可以通过改变聚合反应条件或添加第二小分子单体加以控制。 相似文献
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新型锂离子电池聚合物电解质的制备 总被引:13,自引:1,他引:12
应用倒相法,以PVDF-HFP(偏氟乙烯-六氟丙烯)的混合物为基体制备锂离子电池电解质基质,制得的多孔PVDF基质薄膜具有优良的化学性能及机械性能,其拉伸强度为102kg/cm2,吸附锂离子电池电解液(1mol/LLiPF6的EC/DEC溶液)的能力达到自身重量的350%以上,吸液后其室温电导率在10-3S/cm以上,用它组装成原理电池以后呈现了良好的电化学性能. 相似文献
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Macrocyclic polyethers containing a cholesteryl moiety, e.g., cholesteryl benzo‐15‐crown‐5 (C27H45OOC‐B15C5) and cholesteryl cryptand22 (C27H45OOC‐Cryptand22), were synthesized. The cholesteryl crown ether C27H45OOC‐B15C5 showed liquid crystal characteristics which were observed by polarizing microscopy. In contrast, the cholesteryl cryptand C27H45OOC‐Cryptand22 showed no liquid crystal characteristics. The doping effect of inorganic salts on the liquid crystal formation of cholesteryl benzo‐15‐crown‐5 was also investigated, revealing that the addition of salts resulted in narrower liquid crystal temperature ranges. Both cholesteryl cryptand C27H45OOC‐Cryptand22 and cholesteryl crown ether C27H45OOC‐B15C5 also exhibited the distinctive characteristics of surfactants in solutions. Fluorescence probe of pyrene and surface tension measurement were applied as sensitive tools to study the formation of the micelles and determine the critical micellar concentration (CMC) of the cholesteryl cryptand and crown ether surfactants. The salt effect on the CMC of the cholesteryl cryptand surfactant was also investigated and is discussed. Furthermore, the cholesteryl benzo‐15‐crown‐5 was successfully employed as a quite good phase transfer catalyst for the oxidation of alcohols, e.g., benzhydrol, with NaMnO4 as an oxidant. Effects of temperature, solvent and concentration of the crown ether catalyst on the oxidation of benzhydrol were also investigated. 相似文献