聚乙烯亚胺的合成及应用

聚乙烯亚胺(PEI)是一种应用广泛的材料,具有特殊的性能。综述了聚乙烯亚胺的合成方法,概述了聚乙烯亚胺在采油领域、医用领域、水处理领域、湿部化学领域和CO_2吸附领域的应用,指出了降低生产成本是聚乙烯亚胺拓宽应用的发展方向。     

一种聚乙烯亚胺接枝米糠多糖铁的制备方法及基因载体

<正>本发明公开一种聚乙烯亚胺接枝米糠多糖铁的制备方法及基因载体,涉及基因载体技术领域。所述聚乙烯亚胺接枝米糠多糖铁的制备方法:在惰性气氛下,向米糠多糖铁溶液中依次加入三乙胺和N,N-羰基-二咪唑溶液,避光反应形成反应溶液;将聚乙烯亚胺溶液加入到所述反应溶液中避光反应形成粗样液,并在反应过程中控制混合溶液呈碱性;对所述粗样液进行透析,     

聚乙烯亚胺凝胶光子晶体的制备和可视化pH传感

采用乳液聚合法和毛细力渗透法将聚乙烯亚胺凝胶引入到光子晶体结构中,制备出了颜色鲜亮、结构均匀的聚乙烯亚胺凝胶光子晶体,并探索了其在不同pH值溶液中的传感。结果表明,聚乙烯亚胺凝胶光子晶体在溶液中pH响应迅速,具有良好的pH可逆性,实现了溶液中pH值的快速、灵敏、免标记及可视化传感。     

调剖剂及其制备方法和应用

<正>申请号:CN201811550157.6申请日:20181218申请人:中国石油化工股份有限公司;中国石油化工股份有限公司北京化工研究院本发明涉及油田调剖技术领域,公开了一种调剖剂及其制备方法和应用。该调剖剂包含:水溶性增稠剂、改性交联剂、稳定剂、pH调节剂和水;其中,所述改性交联剂为烷基胍改性聚乙烯亚胺。本发明提供的调剖剂能够实现延时可控交联,且冻胶具有一定的强度,同时具有杀菌作用,实现了一剂多用。     

螯合剂聚乙烯亚胺二硫代氨基甲酸盐双催化绿色合成的方法研究

针对螯合剂聚乙烯亚胺二硫代氨基甲酸盐合成中反应时间长、收率低、反应不充分等不足,选用4-二甲氨基吡啶、1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐双催化剂,聚乙烯亚胺、氢氧化钠水溶液、二硫化碳为原料,优化反应条件,形成一种聚乙烯亚胺二硫代氨基甲酸盐双催化的绿色合成方法。     

三种超分散剂的制备与性能研究

以12-羟基硬脂酸、硬脂酸、聚乙烯亚胺为原料,合成了羧基封端及未封端聚羟基羧酸酯和聚乙烯亚胺接枝聚羟基羧酸酯,并将这三种超分散剂应用于低树脂液浓度的纳米二氧化钛颜料分散体系中,对分散体系的粘度、储存稳定性等进行了探讨.结果表明:用聚乙烯亚胺接枝的聚羟基羧酸酯对纳米二氧化钛颜料体系有较好的分散性能,最件用量为4%(质量分数).     

化学镀镍微道沟超级填充工艺

在次磷酸钠化学镀镍溶液中研究共同添加3-巯基丙烷磺酸钠和聚乙烯亚胺-5000对化学镀镍的影响,通过线性扫描伏安法研究了添加剂对阳极、阴极极化曲线的影响。结果表明,随着3-巯基丙烷磺酸钠浓度的增加,化学镀镍平均速率增大,当ρ(3-巯基丙烷磺酸钠)达到5mg/L时镀镍平均沉积速率达到最大,在此溶液中继续添加聚乙烯亚胺-5000,发现沉积速率下降,且比单独添加聚乙烯亚胺-5000还小。利用3-巯基丙烷磺酸钠对化学镀镍的加速作用和聚乙烯亚胺-5000的抑制作用,以及其在溶液中低的扩散系数,成功实现了化学镍的完全协同填充。     

缓蚀剂文摘

<正> 88-016 钢的酸腐蚀用缓蚀剂日特开昭 60-135585 缓蚀剂含有由聚乙烯亚胺和单环氧化合物反应而得的改性聚乙烯亚胺Ⅰ(R=C_(8-25)烷基)和/或Ⅱ(R′=C_(8-20)烷基,苯基,C_(1-8)烷基取代苯基)。例如,Epomin SP-110(克分子重约1000的聚乙烯亚胺)73份和AOEX24(C_(12-14)α-烯烃氧化物)8份,在     

超支化聚乙烯的应用进展

超支化聚乙烯(HBPE)是一种可通过钯二亚胺催化剂催化乙烯链行走聚合(CWP)而大批量合成的聚合物,具有不同寻常的溶液和固态性质。近年来,HBPE作为一种新生材料,其应用前景不断被挖掘。该文总结HBPE在独特聚烯烃材料构造、药物载体、塑料加工、润滑油和纳米材料等领域的应用进展,以期对致力于HBPE应用开发的研究者们有所帮助。     

泡沫载体的表面处理对泡沫陶瓷性能的影响

本研究通过对软质聚氨酯泡沫塑料的表面进行处理,改善了泡沫陶瓷的性能。用浓度为2.4%的聚乙烯亚胺(PEI)溶液加以活化,可以使聚氨酯泡沫载体更好地和陶瓷浆料结合。聚乙烯亚胺既可以活化聚氨酯表面使其具有亲水性,同时又因其为有机物,燃烧时产生气体从而对坯体的抗压强度性能产生影响。试验证明,用浓度为2.4%的聚乙烯亚胺活化处理泡沫载体可以得到抗压强度最高的泡沫陶瓷产品。     

直接过滤法处理隔油池出水中试研究

针对中石油兰州化工厂隔油池出水尚未达标,该文采用微絮凝一接触过滤直接过滤工艺对其进行深度处理。研究了油、浊度和COD的去除效果及规律,同时对比考察了添加两种絮凝剂聚硅氯化铝铁和聚乙烯亚胺的去除效果。实验表明,直接过滤工艺对含油废水中的油、浊度和COD的去除率分别达到78％、93％和40％以上,在相同试验条件下,聚乙烯亚胺较聚硅氯化铝铁具有更好的除油除浊性能。     

Alkylation of polyethyleneimine for homogeneous ligands in ATRP

Ethylated and butylated polyethyleneimine ligands were synthesized and employed in copper catalyzed atom transfer radical polymerization of styrene and methyl methacrylate with suitable initiators in order to obtain homogeneous polymerizations, resulting in well defined polymers with low polydispersities. Linear curves drawn from kinetics and conversion-molecular weight plots indicate that all the polymerizations were successfully controlled. In ATRP reactions of S and MMA, the apparent rate of polymerization, k_p^app, exhibits a plateau at [Ligand]/[CuBr] ≥ 0.5 ratio for both ligands. The apparent rate constant also decreases by increasing the alkyl chain length of the alkylated polyethyleneimine ligand. Ethylated and butylated polyethyleneimine ligands in ATRP of S and MMA were found to be faster than the existing ATRP ligands.     

表面活性剂对Ni-P-SiC纳米非晶复合电镀分散效果的研究

将纳米SiC应用于电镀非晶Ni-P合金中。以镍电镀液为分散介质,研究了几种典型类型表面活性剂的分散效果。通过沉降实验观察分散体系的悬浮稳定性,利用透射电镜(TEM)及扫描电镜(SEM)分别测定了镀液中SiC颗粒的粒度及粒度分布,以及观察了纳米颗粒在复合镀层表面的分布。实验结果表明,含氟型表面活性剂以及阳离子聚合物聚乙烯亚胺能有效阻止颗粒的团聚;当其含量分别为0.6~0.7g/L及0.7g/L时,获得了稳定悬浮的镀液和颗粒均匀分布的复合镀层。     

Sol-gel alumina coating of wire mesh packing

Wire mesh packings have seen increasing applications to multiphase processes in recent years. Despite the high surface area, open structure and thermal and chemical resistance, wire mesh packings have a complex geometry which hinders some chemical applications, including changes of surface properties through application of a uniformly adhesive coating. In this work, the sol-gel deposition method of alumina coating ceramics was investigated for the first time on stainless steel wire mesh by using Dixon rings as example. The kinetics of deposition during the hydrolysis and polycondensation was followed for a range of initial composition of the coating such as the ratios of Al₂O₃ to water, acid content, polyethyleneimine binder content and the number of deposition cycles. Well-adhered alumina with a thickness up to 20 μm was successfully deposited. The molar ratios of acid to alumina and alumina to water of 0.25 and 0.01, respectively, 48 h of the aging time, 96 h of the mixing time and 2.1 g/L of polyethyleneimine binder formed a free of cracks coating of controlled thickness alumina on the Dixon rings.     

Controllable fabrication of PS/Ag core-shell-shaped nanostructures

In this paper, based on the previous steps, a facile in situ reduction method was developed to controllably prepare polystyrene/Ag (PS/Ag) core-shell-shaped nanostructures. The crucial procedure includes surface treatment of polystyrene core particles by cationic polyelectrolyte polyethyleneimine, in situ formation of Ag nanoparticles, and immobilization of the Ag nanoparticles onto the surface of the polystyrene colloids via functional group NH from the polyethyleneimine. The experimental parameters, such as the reaction temperature, the reaction time, and the silver precursors were optimized for improvement of dispersion and Ag coat coverage of the core-shell-shaped nanostructures. Ultimately, the optimum parameters were obtained through a series of experiments, and well-dispersed, uniformly coated PS/Ag core-shell-shaped nanostructures were successfully fabricated. The formation mechanism of the PS/Ag core-shell-shaped nanostructures was also explained.     

Derivatization of Preformed Polymers to Produce Ceramic Precursors

The feasibility of producing derivatized preformed polymers to be used as ceramic precursors was explored. A borane derivative of polyethyleneimine (PEI) was prepared through a transamination reaction involving Me₃NBH₃. Higher boron loadings were possible with Me₃NB₃H₇. The borane derivative could be cast into films and produced boron nitride upon pyrolysis. Similarly, polyethyleneimine hydrochloride was converted into the cyanohydroborate derivative through a reaction with NaBH₃CN. This derivative was also accessible through a transamination reaction. Both materials produced boron nitride upon pyrolysis. Polyallylamine hydrochloride could not be derivatized. Silyl derivatives of PEI were also prepared, but the products obtained afforded low ceramic yields upon pyrolysis.     

Modification of cellulose acetate: Its characterization and application as an ultrafiltration membrane

The development of cellulose acetate blend membranes using a commercial grade Mycell cellulose acetate and cellulose diacetate with suitable pore structure is discussed. These membranes were characterized in terms of resistance of the membrane, pure water flux, the molecular weight cutoff, water content, pore size, and porosity. The removal of copper metal ions by this blend membrane using polyethyleneimine as a chelating agent was studied. The effects of copper ion concentration and casting solution composition on separation are also discussed. A possible correlation between feed and permeate concentration of copper ion is evaluated. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1939–1946, 1998     

Preparation of cationic water-absorbent resin from PEI and PEO

Hydrophilic network copolymers containing poly(ethylene oxide) and polyethyleneimine blocks were prepared by cross-linking polyethyleneimine with poly(ethylene oxide) terminated at both ends with Br atoms in DMSO. The experimental results show that the network density of the copolymer and the water absorption power thereupon can be efficiently controlled by the change of the amount of DMSO in the reaction system. Further modification was obtained by converting these copolymers into quaternary ammonium salts. The resulting quaternary ammonium salts exhibit enormously enhanced water absorption power. The absorption power of these quaternary ammonium salts in several organic solvents and in aqueous solutions containing Na⁺, Ca²⁺, Mg²⁺, or Fe³⁺ was also examined.     

Adsorption of carbon dioxide using polyethyleneimine modified silica gel

To find an ideal adsorbent for carbon dioxide capture, a new polyethyleneimine modified silica gel material was synthesized with a simple procedure. Three silica gel materials with various particle sizes (15, 25 and 40–63 μm) were prepared and functionalized with polyethyleneimine. The carbon dioxide adsorption amounts of modified silica gel and non-modified silica gel were calculated using a mass balance equation at three different temperatures (298.15, 308.15 and 318.15 K), respectively, and the influence of gas pressure and particle size on adsorption was discussed. Experimental data showed that the carbon dioxide adsorption capacity of modified silica gel was better than non-modified silica gel, and the adsorption capacity gradually decreased with increasing particle size. The smaller particle size (15 μm) PEI modified silica gel had the largest adsorption capacity, at 298.15 K, and the adsorption amounts of various particle sizes of PEI-silica better fit the Langmuir isotherm model.     

Synthesis of basic resins for uranium and copper recovery. (Part IV)

Summary A branched polyethyleneimine has been obtained by ionic polymerization of ethyleneimine. These were crosslinked with 1,3 dibromopropane and showed chelating properties in the presence of copper (II) in aqueous solution. The crosslinked polymer was N-alkylated and showed retention properties for uranium (VI).