改性聚天冬氨酸研究最新进展

聚天冬氨酸具有无毒、可生物降解等优点,是环境友好型水处理剂.将不同官能团引入聚天冬氨酸分子中,可有效增强聚天冬氨酸的阻垢缓蚀性能.根据引入官能团的不同,对聚天冬氨酸的改性研究进行系统分类,并逐类分析官能团的作用,探讨聚天冬氨酸改性发展趋势,对聚天冬氨酸改性研究具有一定的参考价值.     

聚天冬氨酸的改性及其应用研究进展

聚天冬氨酸衍生物是一种新型的可生物降解并具有生物相容性的高分子材料。根据改性方法和引入基团的不同,改性后的聚天冬氨酸可应用于多个领域,具有广阔的应用前景。介绍了近年来聚天冬氨酸的改性研究进展,着重介绍了聚天冬氨酸的改性方法及应用领域,并提出了改性聚天冬氨酸的研究方向。     

一种改性聚天冬氨酸的合成及其缓蚀阻垢性能研究

以马来酸酐、尿素为原料合成聚琥珀酰亚胺,再将聚琥珀酰亚胺与改性剂反应生成改性聚天冬氨酸。通过合成条件实验,确定了合成改性聚天冬氨酸最佳反应物摩尔比、缩聚反应温度和改性剂。并通过静态阻垢法和旋转挂片法测定了改性聚天冬氨酸的阻垢率和缓蚀率。改性聚天冬氨酸的的阻垢率和缓蚀率分别为95.42%和%95.65。与未改性的聚天冬氨酸相比,阻垢率和缓蚀率分别提高了9%和5.64%.     

聚天冬氨酸的改性研究进展

聚天冬氨酸是一类可生物降解的环境友好型绿色阻垢剂。为了提高聚天冬氨酸的阻垢缓蚀性能,目前对聚天冬氨酸的改性主要有引入羟基、磺酸基、羧酸基以及与谷氨酸共聚等方法。不同改性方法获得的聚天冬氨酸具有不同的生物降解性能,并通过改变结垢晶体的形貌和尺寸而表现出不同的阻垢缓蚀性能。因此,后续研究工作应从阻垢机理方面入手,为特定水样定制最佳的改性方法。     

改性聚天冬氨酸类阻垢剂的研究进展

聚天冬氨酸具有无毒、阻垢效率高、可生物降解等特点,是一种新型的绿色环保型水处理剂。本文在简要回顾阻垢剂合成的基础上,综述了近几年在聚天冬氨酸高分子结构改性方面的研究进展,其改性主要是通过在聚天冬氨酸分子结构上引入一些具有阻垢性能的官能团,如羟基、磺酸基和磷酸基等,改性后的聚天冬氨酸具有更好的性能。最后也对其发展方向进行了分析和展望。     

聚天冬氨酸及衍生物的结构对性能的影响研究进展

聚天冬氨酸(PASP)是具有优良的阻垢缓蚀性能和可生物降解性新型绿色水处理药剂,但其性能在某些应用领域存在一定局限性,为加速水处理药剂的绿色化进程,以提高聚天冬氨酸的阻垢性能为目标的多种改性研究相继出现,以聚天冬氨酸及衍生物的现有研究文献为材料,分别研究聚天冬氨酸及衍生物的结构及相应结构产品的性能,总结它们的结构对性能的影响,为今后聚天冬氨酸改性和新型环境友好水处理剂的发展提供理论依据。     

绿色水处理剂聚天冬氨酸及其衍生物的研究进展

聚天冬氨酸是一种可以生物降解的绿色环保高分子水处理剂,具有良好的缓蚀阻垢性能。介绍了近年来聚天冬氨酸的合成方法,着重阐述了聚天冬氨酸的改性技术以及不同复配物研究在国内外的应用现状,并对聚天冬氨酸的发展方向进行了探讨和展望。     

绿色水处理剂聚天冬氨酸及其衍生物的研究进展

聚天冬氨酸是一种可以生物降解的绿色环保高分子水处理剂,具有良好的缓蚀阻垢性能。介绍了近年来聚天冬氨酸的合成方法,着重阐述了聚天冬氨酸的改性技术以及不同复配物研究在国内外的应用现状,并对聚天冬氨酸的发展方向进行了探讨和展望。     

多支化聚天冬氨酸衍生物的合成及其阻垢性能研究

先以顺酐和氨水等为原料合成聚天冬氨酸(PASP),再以PASP和赖氨酸为原料进行接枝反应得到改性聚天冬氨酸衍生物(Lys-PASP)。实验结果表明,与聚天冬氨酸相比,在聚天冬氨酸与赖氨酸质量比为10∶1,改性时间2 h,改性温度120℃条件下得到的改性产品Lys-PASP不仅对碳酸钙具有更好的阻垢性能,而且对碳钢表面也有更好的缓蚀效果,并对氧化铁也具有很好的分散效果;Lys-PASP的加入,不仅改变了碳酸钙的晶型,而且大大降低了碳酸钙晶体的完整程度和有序度,达到了阻止碳酸钙垢形成的目的,起到了阻垢缓蚀的效果。     

聚天冬氨酸酯聚脲的研究进展

聚天冬氨酸酯聚脲是一种新型的脂肪族、慢反应、高性能的绿色环保材料，本文根据当下对聚天冬氨酸酯聚脲的研究趋势和热点进行了总结归纳，介绍了聚天冬氨酸酯聚脲结构、不同于常规聚脲的反应机理以及优缺点，重点介绍了聚天冬氨酸酯聚脲的制备、改性方法以及聚天冬氨酸酯聚脲近几年的应用领域，最后总结归纳了聚天冬氨酸酯聚脲发展过程中存在的问题和发展方向。     

扫描电子显微镜在沉淀法白炭黑研究中的 应用现状与展望

介绍扫描电子显微镜(简称扫描电镜)的特点和测试原理及其在沉淀法白炭黑研究中的应用。与透射电子显微镜相比,扫描电镜可以获得更准确的沉淀法白炭黑微观结构,且价格适中,易于操作,结果分析简单。扫描电镜用于沉淀法白炭黑制备研究中可以获得沉淀法白炭黑粒子大小、团聚体形貌和孔结构等微观结构信息,用于沉淀法白炭黑改性研究中可以观测改性效果,用于沉淀法白炭黑/橡胶复合材料研究中可以表征沉淀法白炭黑在复合材料中的分散程度。     

NOVEL LOW-COST JUTE–POLYESTER COMPOSITE. II. SEM OBSERVATION OF THE FRACTURED SURFACES

The scanning electron micrographs (SEM) were taken at different magnifications with respect of the fractured surfaces of the polymer composites prepared from unsaturated polyester resin and jute sliver with 60% fiber loading by weight. The composite specimens were prepared using both untreated (control) and chemically modified (bleached) jute fibers by solution impregnation and hot curing methods and are designated as JPH-60(C) and JPH-60(B), respectively. The method of preparation of the composite specimens have been discussed. The specimens were subjected to tensile and flexural tests and the fractured surfaces were observed under SEM as stated. The fiber surface morphology was also studied from the SEM photographs in the case of the control and bleached jute filaments. The SEM photographs of the fractured surfaces of the composites showed varied extents of fiber pull-outs under both tensile and flexural failure modes. The nature of interfacial adhesion has been discussed on the basis of the SEM study. A good correlation between the SEM study and the mechanical strength properties of the composites could be established. Exceptionally high flexural strength of the composites JPH-60(B) compared to JPH-60(C) could be explained from the SEM study.     

SEM observation of wet biological specimens pretreated with room-temperature ionic liquid

A facile pretreatment process for SEM: The use of room temperature ionic liquids (RTILs) provides an interesting method for SEM of biological specimens. We used a novel and concise method of pretreatment, excluding fixation or Au sputtering steps. Fine and smooth-textured SEM images of a wide variety of biological specimens treated in this way were observed without artefacts.     

扫描电镜技术及其在矿物加工领域的应用现状

扫描电镜一种新型的多功能的,用途最为广泛的电子光学仪器。数十年来,扫描电镜已广泛地应用在生物学、医学、冶金学等学科的领域中,促进了各有关学科的发展。本文介绍了扫描电镜的工作原理及特点,分六个方面重点介绍了扫描电镜在矿物加工中的应用,并提出了扫描电镜的发展方向。     

高分子材料微观形态结构的扫描电镜研究

利用扫描电镜对聚乙烯(PE)、丙烯腈-丁二烯-苯乙烯共聚物(ABS)等高分子材料填料的分散性及表面与断裂界面进行了研究。结果表明,扫描电镜能够详细观察研究高分子材料的表面结构、微观相分离等,便于表征高分子材料微观结构形态,是分析高分子材料微观结构形态的有效手段。     

聚天冬氨酸的阻垢机理

本论文对加及未加聚天冬氨酸阻垢剂的CaCO3垢样做扫描电镜和X射线衍射实验,进而对聚天冬氨酸的阻垢机理做了探讨。     

Simultaneous Visualization of Wet Cells and Nanostructured Biomaterials in SEM using Ionic Liquids

This work presents a successful methodology to image mammalian cells adhered to nanostructured titanium by using scanning electron microscopy (SEM) operating in low-vacuum mode following ionic liquid treatment. Human osteoblast-like Saos-2 cells were treated with a room-temperature ionic liquid, 1-ethyl-3-methylimidazolium tetrafluoroborate, and subsequently imaged on titanium by SEM. Titanium substrates were modified to create laser-induced periodic surface structures (LIPSS) for visualization at the submicron scale. By using a combination of fluorescence-based cell metabolism along with light microscopy and SEM image analysis, the shape and location of irradiated cells were confirmed to be unchanged after multiple irradiation sessions; the viability of minimally irradiated cells was also unaltered. The wet imaging conditions combined with a rapid facile protocol using ionic liquid allows this technique to fulfill a niche in examining cellular behavior on biomaterials with submicron surface features. The demonstrated method to track observed cell adhesion to submicron surface features by SEM has great implications for understanding cell migration on nanostructured surfaces as well as the exploration of simpler SEM preparation methods for cellular imaging.     

扫描电镜粉末样品的制备方法

用扫描电镜来观察粉末样品的形貌、粒度和粒度分布可以提供直观精确的结果。这种分析方法被广泛的应用于科研和生产。在电镜的分辨率确定的条件下,电镜观察样品的制备对观察效果具有关键的作用。文章总结了扫描电镜粉末样品的常用方法,并用实验对各种制备方法进行了对比,给出了针对不同性质的粉末样品的合适制样方法。     

Radical styrene polymerization in the presence of trace levels of sulfonic acids

The bulk polymerization of styrene in the presence of the vinyl functional sulfonic acid 2‐sulfoethylmethacrylate (SEM) was found to have utility for making polystyrenes with narrow polydispersity, bimodal polydispersity, and ultrahigh molecular weight at fast polymerization rates. Narrow polydispersity polymers were made by the addition of SEM to nitroxide‐mediated polymerizations. Bimodal polydispersity polymers were made by the ultrahigh molecular weight component being made in the presence of SEM in the absence of an initiator and the low molecular weight component being made in the presence of an initiator and/or chain‐transfer agent. Ultrahigh molecular weight monomodal polystyrenes were prepared at much faster polymerization rates than possible via spontaneous polymerization in the absence of SEM. SEM was found to be more effective, by an order of magnitude, than camphor sulfonic acid on a weight basis and, because it is copolymerized into the polymer chain, should not lead to corrosion problems during fabrication of the polymer. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 869–875, 2003     

用热分析法探讨劣质聚氯乙烯管的鉴别方法

用热重和微分热重法对优质和劣质ＰＶＣ管进行温度扫描，并扫描电镜观察其微观形貌，从而鉴别出劣质ＰＶＣ管和优质管的差异。