共查询到20条相似文献,搜索用时 171 毫秒
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主要研究了一种用于锂离子电池的水性粘结剂乙烯醇-羧酸盐聚合物,对乙烯醇-羧酸盐聚合物的制备工艺、分子结构及性能进行了研究。主要针对锂离子电池负极对粘结剂的需求条件进行了详细的研究,制备出性能优异的绿色环保水溶性粘结剂。 相似文献
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论述了热塑性弹性体用作固体推进剂粘结剂的重要性以及目前这一领域的研究状况,对热塑性弹性体在推进剂中应用所存在的问题和这一领域的主要研究方向进行了阐述。指出了热塑性弹性体是推进剂用粘结剂的一个重要发展方向。 相似文献
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论述了目前我国电炭行业粘结剂用中温煤沥青的评价方法,分析了该评价方法的优缺点。借鉴近十多年国内外对煤沥青性质的新研究成果,对粘结剂用中温煤沥青品质的评价进行分析计论,在此基础上提出了新的评价方法。 相似文献
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以酚醛树脂等材料为主要实验原材料,在X射线光电子能谱(XPS)测试方法环境下针对实验材料所制备的粘结剂对碳材料的粘接性能进行分析。结果表明:酚醛树脂、碳化硼等原材料制备而成的粘结剂在XPS条件下所形成的粘接胶层为无定形碳状态形成的类似骨架的立体结构,随着测试环境温度的提升,酚醛树脂等材料制备的粘结剂有序化程度会逐步提高,粘结剂在粘接界面表现出相容性逐渐提升的变化态势;同时粘结剂粘接界面上会逐渐形成一层B2O3,实现了化学键合连接。 相似文献
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选取需拔除的完整无龋人离体第3磨牙,随机分A、B、C组,分别采用全酸蚀粘结剂、二步法自酸蚀粘结剂和一步法自酸蚀粘结剂。考察各组牙本质粘接强度、牙齿镶嵌的密合性,分析各试件断裂类型,比较3种粘结剂对牙本质粘接强度及耐久性的影响。即刻、存储24 h、存储12个月时,A、B组牙本质粘接强度高于C组,牙本质微渗漏情况低于C组(P<0.05),A、B组组间差异不显著;各组存储24 h、存储12个月后牙本质粘接强度和牙本质微渗漏情况较即刻降低(P<0.05);各组存储12个月牙本质粘接强度较存储24 h时降低(P<0.05),A、B组存储12个月牙本质微渗漏较存储24 h时降低,且A组低于B组(P<0.05)。即刻、存储24 h、存储12个月时,各组牙本质断裂主要为混合断裂,但不同存储时间牙本质断裂类型差异不显著(P>0.05)。全酸蚀粘结剂和二步法自酸蚀粘结剂对牙本质有较好粘接强度及耐久性优于一步法自酸蚀粘结剂,且随时间延长,其粘接强度逐渐降低;而全酸蚀粘接剂粘接强度及耐久性相对较好。 相似文献
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高掺量粉煤灰烧结砖的掺灰量大于60%(体积比).粉煤灰是一种瘠性料,本身并不具有粘结性,其所以能被制成烧结砖,主要是加入粘结剂的作用.为使其能在较少粘结剂作用下挤制成型,须使粘结剂均匀分布在粉煤灰的各个部分.原料的均匀混合靠混料设备完成,而原料均化程度及混合料的密实度又直接影响到半成品砖的质量,因此,原料处理工序成了高掺量粉煤灰烧结砖生产工艺中的关键环节.本文对混合、均化、练泥工艺及装备做一简单介绍. 相似文献
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注塑模型腔壁厚计算公式讨论 总被引:2,自引:1,他引:1
凹模安装在定模上、凸模安装在动模上的注塑模结构,其凹凸模的受力情况与凹模安装在动模上、凸模安装在定模上不同,因此注塑模型腔壁厚的计算公式也不同.针对凹模安装在定模上、凸模安装在动模上的注塑模结构.对矩形型腔模具进行了受力分析和型腔壁厚计算。 相似文献
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己二酸制备方法的绿色评价及绿色合成初探 总被引:1,自引:0,他引:1
介绍了工业化生产己二酸(ADA)的主要工艺路线,从原料、工艺条件、原子利用率及环境因子等角度评述了各生产路线的绿色属性。同时阐述了己二酸绿色合成方法的探索,对其工业化应用进行了展望,并给出了建议。 相似文献
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Investigations on the formation mechanisms of silicate films on reverse osmosis membranes and their morphological characteristics are presented. Relevant influencing factors on the formation of coatings are considered and the individual mechanisms are described. Furthermore, the essential characterization characteristics for the investigation of silicate coatings are determined, the applied analysis methods are described and an overview of the sample preparation is given. 相似文献
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Carlos M. Romo-Kröger 《Powder Technology》2006,161(3):235-241
Samples of atmospheric particulate matter placed on Nuclepore® filters were analyzed by microscopy and complementary techniques. Volcanic ash placed on glass surfaces and atmospheric material on Teflon® filters were also studied by microscopy. The analyzed samples are related to volcanic eruptions, urban environments, and mining activity. Nuclepore filters are thin sheets with smooth surfaces on which particles are fixed almost uniformly after filtration, which makes them especially adequate for study by microscopy. Here a selection of samples analyzed by microscopy is presented, along with information on the shape and size of particles and their distribution on the surface of the filter. Hypotheses are advanced on the origin of particles, their crystalline states, and the physical mechanisms to trap particles on the filter surface. A morphological classification of the particles was carried out according to their appearance in the several samples analyzed. Other complementary analyses performed by PIXE (particle induced X-ray emission), by electron microprobe, by X-ray diffraction and by granulometry, are commented. The implications of the particles studied to human health are also discussed. 相似文献
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考虑SSI效应的TMD减震特性振动台模型试验 总被引:2,自引:0,他引:2
设计并完成了考虑土与结构相互作用的 TMD减震控制振动台模型试验。通过试验 ,分析了刚性地基和柔性地基上 TMD对主体结构的减震效应 ,探讨了 SSI效应对结构减震控制的影响。在此基础上 ,将柔性地基上结构— TMD体系中主体结构地震反应看作是 SSI效应、TMD减震效应以及 SSI和 TMD的耦合效应三部分共同作用结果 ,分析了不同工况下三种效应对主体结构地震反应的影响大小。试验结果表明 :SSI效应对 TMD的减震性能有很大影响 ,这使得基于刚性地基假设设计的 TMD系统在柔性地基上的减震效果不理想 ,甚至在某些时候可能产生负面效果。对刚性地基和柔性地基上影响 TMD减震性能的一些因素进行了探讨。 相似文献
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Liudmila Zakharova Viktoria Sharova Marina Izvolskaia 《International journal of molecular sciences》2021,22(1)
Different aspects of the reciprocal regulatory influence on the development of gonadotropin-releasing hormone (GnRH)-producing- and immune systems in the perinatal ontogenesis and their functioning in adults in normal and pathological conditions are discussed. The influence of GnRH on the development of the immune system, on the one hand, and the influence of proinflammatory cytokines on the development of the hypothalamic-pituitary-gonadal system, on the other hand, and their functioning in adult offspring are analyzed. We have focused on the effects of GnRH on the formation and functional activity of the thymus, as the central organ of the immune system, in the perinatal period. The main mechanisms of reciprocal regulation of these systems are discussed. The reproductive health of an individual is programmed by the establishment and development of physiological systems during critical periods. Regulatory epigenetic mechanisms of development are not strictly genetically controlled. These processes are characterized by a high sensitivity to various regulatory factors, which provides possible corrections for disorders. 相似文献
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综述了近年来国内外对二维编织复合材料管件力学性能的研究成果及研究进展,主要包括力学性能实验研究、结构几何模型和数值仿真研究。在实验研究中介绍了二维编织复合材料管件的能量吸收性能及弹性性能,同时重点介绍了编织角及编织结构的变化对复合材料各种性能的影响的最新研究进展;在结构几何模型研究中,以细观结构、宏-细观结构模型研究为主,详细介绍了当前流行的建模方法;在数值仿真研究方面,介绍了研究人员根据二维编织成型原理以及纤维在复合材料中的取向建立的实体模型仿真分析。最后,总结当下研究中存在的问题,并对未来研究趋势进行展望。 相似文献
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本文简要说明了工程陶瓷材料裂纹扩展阻力曲线(R-Curve)行为的理论基础,阐述了陶瓷材料阻力曲线行为研究的历史和现状,并对目前研究中存在的问题做了评述,提出了进一步探讨的方向。 相似文献
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This paper studies the role of chemical fertilizers in sustaining the growth in foodgrain production in the major rice growing countries in Asia. The trends in fertilizer consumption are reviewed, the yield response and change in policies in the fertilizer sector and their impact on fertilizer prices are assessed and factors affecting fertilizer demand are analyzed. The implications of sustaining food security and the environment on fertilizer use are critically examined, future projections on food and fertilizer demand are made and areas of research needed to achieve the targets are suggested. 相似文献