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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%. 相似文献
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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。 相似文献
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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。 相似文献
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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。 相似文献
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《Polymer-Plastics Technology and Engineering》2013,52(2):333-350
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. 相似文献
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Tsuda T Nemoto N Kawakami K Mochizuki E Kishida S Tajiri T Kushibiki T Kuwabata S 《Chembiochem : a European journal of chemical biology》2011,12(17):2547-2550
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. 相似文献
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扫描电镜技术及其在矿物加工领域的应用现状 总被引:1,自引:0,他引:1
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。 相似文献
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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。 相似文献
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Dr. Bryan E. J. Lee Liza-Anastasia DiCecco Hourieh Exir Prof. Dr. Arnaud Weck Prof. Dr. Kyla N. Sask Prof. Dr. Kathryn Grandfield 《Chembiochem : a European journal of chemical biology》2021,22(3):571-576
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. 相似文献
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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 相似文献
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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。 相似文献