胶原-丙烯酸丁酯接枝共聚物/氧化铝核壳型复合纳米粒子的制备及其红外发射率研究

在水溶液中将胶原大分子吸附于氧化铝纳米粒子表面,通过自由基引发的接枝共聚反应在胶原大分子上接枝聚丙烯酸丁酯支链制备了胶原丙烯酸丁酯接枝共聚物/氧化铝核壳型复合纳米粒子.确定了胶原大分子在氧化铝粒子表面的最佳吸附量以及探讨了接枝反应时间对接枝率、复合粒子的壳层厚度及红外发射率(8~14μm)的影响.结果显示,接枝反应时间在12—20h时,复合纳米粒子的壳层为厚度小于15nm的胶原丙烯酸丁酯接枝共聚物层;聚丙烯酸丁酯支链的接枝率为3.7%左右时,复合纳米粒子在丙酮、氯仿等有机溶剂中分散良好;胶原吸附量为3.01g/100gA l2O3时,胶原氧化铝复合物的红外发射率下降程度最大,相应的复合纳米粒子的红外发射率最低可至0.527.胶原大分子与氧化铝纳米粒子的界面相互作用导致了复合纳米粒子红外发射率的降低.     

芹菜甲素分子印迹聚合物的制备及其吸附性能研究

以芹菜甲素为模板分子,通过沉淀聚合法制备了芹菜甲素分子印迹聚合物(MIPs)和非分子印迹聚合物(NIPs),并通过动态吸附、静态吸附和选择性吸附实验对所制备的分子印迹聚合物的吸附性能进行了表征.结果表明,当芹菜甲素的浓度为0.1 mmol L~(-1),吸附时间为12 h时,MIPs达到吸附平衡且最大吸附量为3.561 mg g~(-1).Scatchard分析表明,在MIPs中存在高亲和性和低亲和性两种结合位点,而在NIPs中只存在一种非特异性结合位点.选择吸附实验表明,MIPs对芹菜甲素具有高选择性和良好的专一识别性能.该研究可为芹菜甲素分子印迹聚合物作为固相萃取材料分离提取中药中有效成分芹菜甲素提供了理论基础.     

活性粒子在电极/溶液界面上吸附

基于电极/溶液界面层基本图象.分析无机和有机活性粒子在电极/溶液界面层中的吸附规律.针对活性粒子在电极界面上发生吸附的原因及对活性粒子在电极界面上吸附的影响因素进行了探讨.     

关于微型高分子化学实验的研究

高分子化学实验是使学生进一步了解、掌握聚合物的合成、大分子反应、聚合物结构表征的基本方法和培养学生实际动手能力的重要手段.本文作者通过多次实验,研究和开发了多项高分子化学实验微型化的实验方法.     

胺醇萃取剂及钯萃合物界面性质研究

研究了胺醇萃取体系的界面吸附和胶团形成热力学,发现萃合物界面吸附能力大于萃取剂,萃合物胶团形成自发进行.通过测定不同稀释剂中萃取剂的界面张力,研究了萃取体系三相形成的原因.     

混凝土降粘和易性调节剂的制备及性能评价

该实验开发了一种降粘型的减水剂母液，从减水剂分子结构设计层面出发，给出以下研究结论：(1)筛选合适的链转移剂、引发体系及单体，合成大分子量的梳型高分子聚合物，提高产品粘度；(2)优选共聚单体，接枝离子型亲水基团至和易性调节剂大分子中，增加新拌混凝土气泡中吸附的表面活性剂的电荷量，通过气泡中的双电层排斥作用，增厚气泡，达到稳泡效果；(3)利用聚羧酸减水剂的原料合成混凝土降粘和易性调节剂，利用相似相溶原理，使混凝土和易性调节剂与聚羧酸减水剂达到互溶效果，解决常规增稠剂、引气剂等与聚羧酸减水剂相容性问题.     

葡聚糖为筛分介质的无胶筛分毛细管电泳相互作用分析

本文利用线性高分子聚合物葡聚糖对大分子物质的筛分作用,通过改变大分子蛋白的电泳淌度,扩大迁移时间窗口,将无胶筛分毛细管电泳成功地运用于相互作用分析中,测定了伊贝沙坦与牛血清白蛋白之间的结合常数,建立了测定具有相似淌度的药物与蛋白之间结合常数的模型,进一步发展了毛细管电泳相互作用分析方法.     

苯磺酸氨氯地平印记聚合物的制备及吸附性能

采用本体聚合的方法合成了苯磺酸氨氯地平印迹聚合物,对功能单体的种类及用量、交联剂用量、模板浓度和聚合时间等参数进行了优化,扫描电子显微镜(SEM)和选择性吸附实验表征了印记聚合物的结构特征及分子识别性能。结果表明,以丙烯酸为功能单体,当氨氯地平、丙烯酸和乙二醇二甲基丙烯酸酯的摩尔比为1∶2∶10时,所合成的聚合物具有最大的吸附容量,达到(127.08±2.92)mg/g,印迹因子α为1.30±0.03,苯磺酸氨氯地平与二羟丙茶碱的分离因子δ为6.57。首次合成了苯磺酸氨氯地平印记聚合物,并且这种聚合物对苯磺酸氨氯地平有良好的识别和富集能力。     

硅胶表面双酚A分子印迹聚合物的制备和识别特性

采用表面分子印迹技术,在硅胶表面合成了基于双酚A的分子印迹聚合物,用紫外光谱分析了模板分子的洗脱效果,用扫描电子显微镜表征了印迹聚合物的表面形貌。静态吸附实验表明,该印迹聚合物对双酚A具有较好的选择性吸附。     

温度敏感不锈钢丝分子印迹固相微萃取头的制备

以多巴胺修饰的不锈钢丝为基质,制备了一种三唑醇温敏分子印迹聚合物为涂层的固相微萃取头.利用红外光谱,扫描电镜等对其结构和形貌进行了表征,并通过静态吸附实验、吸附动力学实验及选择性吸附实验对该涂层材料的吸附性能进行了研究.结果表明:所制备的材料对温度敏感,具有较快的传质动力,并对三唑醇有良好的吸附特异性和选择性.     

不同乳液聚合物和硅酸盐水泥的相互作用

用乳液聚合法在水介质中合成了带不同电荷的乳液粒子,通过检测流动电位测定乳液的电动性能．通过测定zeta电位和聚合物在水泥颗粒上的吸附量,研究了有机乳液聚合物与水化水泥粒子的相互作用．结果表明：阴离子乳液从水泥孔隙溶液中吸附大量的Ca2＋,水泥粒子zeta电位证明水化水泥表面能吸附乳液粒子．通过zeta电位和用沉淀法——紫外可见分光光度计测定得到的乳液在水泥表面的饱和吸附量是一致的．     

Preparation and adsorption behaviors of Cu(II) ion-imprinted polymers

Imprinted polymers were prepared for selective removal of Cu（Ⅱ） ions from metal solutions. Three ion-imprinted polymers were synthesized with methacrylic acid （MAA）, acrylamide （AA） and N,N＇-methylenebisacrylamide （MBAA） respectively as the functional monomers, ethleneglycoldimethacrylate （EGDMA） as the cross-linking agent, 2,2＇- azobisisobutyronitrile （AIBN） as the initiator and Cu （Ⅱ） ion as the imprint ion. The template Cu （Ⅱ） ion was removed from the polymer by leaching with a liquid of a 1：1 volumetric ratio of HCl to ethylenediaminetetraacetic acid （EDTA）. The capacity and selectivity of Cu（Ⅱ） ion adsorption were investigated with the three imprinted polymers and their non-imprinted counterparts. The polymers have a maximum adsorption capacity at pH 7.0. The isotherm of their batch adsorption of Cu（Ⅱ） ions shows a Langmuir adsorption pattern. Imprinted polymers all have a much higher capacity and higher selectivity of Cu（Ⅱ） adsorption than nonimprinted ones. MAA polymer benefits the most from imprinting. Imprinted MAA polymer has the highest selectivity when used to rebind Cu （Ⅱ） ion from an aqueous solution in the presence of other metal ions. Ion imprinting can be a promising technique of preparing selective adsorbents to separate and preconcentrate metal in a medium of multiple competitive metal ions through solid phase extraction （SPE）.     

Preparation and adsorption behaviors of Cu(Ⅱ) ion-imprinted polymers

Imprinted polymers were prepared for selective removal of Cu(II) ions from metal solutions. Three ion-imprinted polymers were synthesized with methacrylic acid (MAA), acrylamide (AA) and N,N'-methylenebisacrylamide (MBAA) respectively as the functional monomers, ethleneglycoldimethacrylate (EGDMA) as the cross-linking agent, 2,2'-azobisisobutyronitrile (AIBN) as the initiator and Cu (II) ion as the imprint ion. The template Cu (II) ion was removed from the polymer by leaching with a liquid of a 1:1 volumetric ratio of HCl to ethylenediaminetetraacetic acid (EDTA). The capacity and selectivity of Cu(II) ion adsorption were investigated with the three imprinted polymers and their non-imprinted counterparts. The polymers have a maximum adsorption capacity at pH 7.0. The isotherm of their batch adsorption of Cu(II) ions shows a Langmuir adsorption pattern. Imprinted polymers all have a much higher capacity and higher selectivity of Cu(II) adsorption than non-imprinted ones. MAA polymer benefits the most from imprinting. Imprinted MAA polymer has the highest selectivity when used to rebind Cu (II) ion from an aqueous solution in the presence of other metal ions. Ion imprinting can be a promising technique of preparing selective adsorbents to separate and preconcentrate metal in a medium of multiple competitive metal ions through solid phase extraction (SPE).     

Condensation polymerization

The very idea that large polymer molecules can indeed exist was hotly debated during the early part of the 20th century. As highlighted by Sivaram in his articles on Carothers and Flory, Staudinger’s macromolecular hypothesis was fl- nally accepted, and the study of polymers gained momentum because of the remarkable efforts of the these two individuals who laid down the foundations concerning the processes that led to the formation of large polymer molecules, and to those that led to an understanding of many of their extraordinary physical properties. Condensation polymerizations, as the name suggests, utilizes bond-forming reactions that generate a small molecule condensate, which often needs to be continuously removed to facilitate the formation of the polymer. In this article, I shall describe some of the essential principles of condensation polymerizations or more appropriately called step-growth polymerizations; and I will also describe some interesting extensions that lead to the formation of polymer networks and highly branched polymers.     

苏丹红I分子印迹聚合物的制备与识别性能研究

通过分子印迹技术,以苏丹红I为印迹分子,甲基丙烯酸为功能单体,季戊四醇三丙烯酸酯为交联剂,偶氮二异丁腈做引发剂,制备了苏丹红I分子印迹聚合物。利用静态平衡法和Scatchard分析法研究了印迹聚合物和非印迹聚合物对苏丹红I选择吸附性能。结果表明,印迹聚合物对苏丹I具有很好的特异性结合能力,为复杂样品中的苏丹红I的选择性富集及快速检测提供了一条新的途径。     

茶碱分子印迹PDVB-SO3H/PDVB IPN的合成及热力学性能研究

以茶碱为摸板分子，采用顺序聚合法，合成了分子印迹的大孔磺化聚二乙烯基苯，聚二乙烯基苯互穿聚合物网络（PDVB—SO3H／PDVB IPN），测定了IPN的结构和热力学性能。结果表明，制备的分子印迹聚合物对印迹分子茶碱具有较好吸附作用，且能保持第一网的树脂粒径。通过热力学性能研究，讨论了IPN吸附水溶液中茶碱的机理。     

Water-dispersed bone morphogenetic protein nanospheres prepared by co-precipitation method

INTRODUCTION Bone morphogenetic proteins (BMPs) are agroup of proteins that can induce new bone forma-tion at orthotopical and heterotopical sites in ex-perimental animals (Urist et al., 1983; Groeneveldand Burger, 2000). Their biological activity hasstimulated interest in its clinical use for bone repair.In clinical use, BMPs are undergoing evaluationincluding system administration, gene transfer andlocal matrix delivery vehicle implantation (Kirker-Head, 2000; King et al., 199…     

Water-dispersed bone morphogenetic protein nanospheres prepared by co-precipitation method

A modified complex coacervation-co-precipitation method was used to prepare bone morphogenetic protein(BMP)-loaded nanospheres. Three natural polymers were used as packing materials to obtain nanoscale delivery device for BMP,in the presence of phosphatidylcholine functioning as stabilizer. Positively charged polysaccharide, N,N-diethylaminoethyl dex-tran (DEAE-dextran) tended to form stable, uniform and smaller size particles carrying BMP. Negatively charged bovine serumalbumin (BSA) induced precipitation of the produced BMP particles due to its weak interaction with BMP molecules, although itproduced nanosized BMP spheres. While collagen, a weakly positively charged protein shaped larger particles due to the stronginteraction among themselves. A mechanism of co-precipitation process was also deduced to depict the formation of stablenanospheres.     

Molding of Molecular Sieve Residues and Their Application in Cleaning Oily Wastewater

To deeply clean oily wastewater,molecular sieve residues (MSRs) were sufficiently recycled and utilized due to their high specific surface area,porous structure,and outstanding adsorption property.Molding MSRs (MMSRs) were prepared by adding additives (starch,citric acid,and soluble glass) to MSRs and were then filled into a fixed bed for adsorbing and separating the oil in wastewater.Sodium dodecylbenzenesulfonate was used to modify the MMSRs,and their adsorption property was also investigated.In addition,the MSRs were characterized by scanning electron microscopy,energy-dispersive X-ray spectroscopy,Brunauer-Emmett-Teller analysis,and Fourier transform infrared spectroscopy.The results indicated that MMSRs satisfied the filling requirement of fixed bed,and their dynamic adsorption capacity could reach 0.1854 mg g~(-1).Furthermore,the static adsorption capacity of MMSRs achieved 1.7346 mg g~(-1) in the optimum conditions,and the oil adsorption performance of modified MMSRs was further enhanced.Therefore,this work suggests that MSRs are promising alternatives in cleaning oily wastewater.     

联合絮凝模型及其试验研究

本文通过实验,证明了作者所提出的联合絮凝模型的正确性,并发现在使用高分 子絮凝剂时,絮凝剂的电性对絮团尺寸的影响并不重要.