共查询到20条相似文献，搜索用时 250 毫秒
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有机硅改性丙烯酸树脂的制备 总被引：7，自引：0，他引：7
有机硅改性丙烯酸树脂(硅丙树脂)的制备方法主要分为物理共混法和化学改性法．综述了近年来关于硅丙树脂制备方面的研究进展，并详细介绍了乙烯基大分子硅单体的制备过程以及硅丙树脂制备过程中乳化体系、单体种类和加料方式等因素对产品性能的影响． 相似文献
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采用水溶液聚合方法辐射制备聚丙烯酸钠/蒙脱土复合材料(soldium polyacrylate acid Composite,PAAC)。研究辐射条件、原料配比对性能的影响,并优化组分比例和聚合工艺。结果表明,PAAC的综合性能显著优于均聚聚丙烯酸钠,具有显著的调剖应用效果。 相似文献
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碳纳米管/聚合物基复合材料的研究进展 总被引：1，自引：0，他引：1
综述了碳纳米管/聚合物基复合材料的研究进展;介绍了碳纳米管/聚合物基复合材料的制备方法：共混法、原位聚合法、溶胶-凝胶法,以及碳纳米管/聚合物基复合材料的优异性能及应用;并评述了碳纳米管/聚合物基复合材料今后的研究发展趋势。 相似文献
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硼酚醛树脂具有优良的阻燃、耐高温、低烟、低毒等特性。本文以酚醛树脂为主防火剂、胺类为协效剂,分析了对丙烯酸树脂防火性能的影响。参照试验单位实验结果发现,硼酚醛树脂能显著提高丙烯酸树脂的防火性能,硅酸铝、六次甲基四胺具有有良好的协效作用。硼酚醛改性丙烯酸树脂膨胀型防火涂料原料组成简单、来源丰富、成本较低、防火性能好,具有很好的应用前景。 相似文献
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介绍了水性油墨的发展前景及应用，利用水溶性丙烯酸树脂和丙烯酸树脂乳液为连接料，炭黑为填料及其它助剂制备了水性黑色油墨。 相似文献
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目的:探索一种实用的三七总皂苷溶液浓缩方法。方法:采用甲基丙烯酸甲酯-二乙烯苯树脂与聚合硅胶柱结合层析法对三七总皂苷进行浓缩,获得一定浓度的三七总皂苷浓缩液。采用HPLC法对三七总皂苷的溶液浓度与回收率进行测定。结果:经一定方式配合使用的甲基丙烯酸甲酯-二乙烯苯树脂与聚合硅胶对三七总皂苷溶液具有一定的浓缩富集能力,三七总皂苷溶液浓度最高提高4倍,回收率为88.5%。结论:经一定方式配合使用的甲基丙烯酸甲酯-二乙烯苯树脂与聚合硅胶对三七总皂苷溶液可实现快速、一定浓度的浓缩,方法简单、高效、实用,适用于工业生产。 相似文献
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现代社会科技的发展,无论从技术方面还是从材料应用方面都取得了巨大的进步。树脂基复合材料是现代工业中重要的复合型材料,是在航空工业中具有极为重要的地位。但是在其应用中,仍因其自身特点受到极大的限制,因此,对树脂基复合材料的研究仍需要作出进一步的努力。本文对树脂基复合材料在航空工业中的应用进行了研究,介绍了树脂基复合材料防护涂层现阶段研究情况,并对树脂基复合材料防护涂层在未来的发展方向进行了展望,旨在为树脂基复合材料的科学应用产生积极的影响。 相似文献
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The investigation here described, in so far as it deals with the radiating characteristics of the incandescent mantle, constitutes chiefly an extension of the work of Rubens on the thoria-ceria mixtures, to a large family of such combinations. It exhibits the Welsbach mantle of commerce simply as one of a group of possible combinations of radiating materials, behaving according to the same general laws, but remarkable among them for the degree to which the characteristics of selective radiation are exhibited.A more detailed study has been made than any heretofore on the behavior under various conditions of the absorption bands to which the enhanced visible radiation of the more efficient mantles are due. While no explanation has been found for the occurrence of the visible absorption bands of ceria and other materials—a question to be solved only by an intimate knowledge of the structure of matter—the information learned as to the conditions under which they appear and disappear has made possible a rather complete explanation of some long-standing enigmas, notably that of the different behavior of the mantle in flame and cathode-discharge heating.Another line of investigation has here been taken up apparently for the first time in any detail; namely, that of the energy relations holding with flame heating of radiating materials. As a result of the study it has been possible to fix with some definiteness the possible attainable efficiencies of gas-light production by present methods. These, while low, are still many times any now reached. 相似文献
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随着时代的发展,社会对商务英语口译人员的需求不断增加。许多高职院校顺应市场需求,纷纷开设了商务英语口译课。但由于起点较低,口译教学在实践中遇到了不少难题。本文对高职院校商务英语口译教学的现状进行了分析,从教师、教材和教法等方面展开讨论,以期能对改进高职商务英语口译教学有所帮助。 相似文献
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Surface patterning of bonded microfluidic channels 总被引：1，自引：0，他引：1
Priest C 《Biomicrofluidics》2010,4(3):32206
Microfluidic channels in which multiple chemical and biological processes can be integrated into a single chip have provided a suitable platform for high throughput screening, chemical synthesis, detection, and alike. These microchips generally exhibit a homogeneous surface chemistry, which limits their functionality. Localized surface modification of microchannels can be challenging due to the nonplanar geometries involved. However, chip bonding remains the main hurdle, with many methods involving thermal or plasma treatment that, in most cases, neutralizes the desired chemical functionality. Postbonding modification of microchannels is subject to many limitations, some of which have been recently overcome. Novel techniques include solution-based modification using laminar or capillary flow, while conventional techniques such as photolithography remain popular. Nonetheless, new methods, including localized microplasma treatment, are emerging as effective postbonding alternatives. This Review focuses on postbonding methods for surface patterning of microchannels. 相似文献
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近年来高职教育在全国各地都取得了较大发展。高职英语教学是高职教育中的重要环节,然而笔者相信许多从事高职英语教学的教师都和我们一样面临着许多难题。学生入学成绩参差不齐,大部分学生入学英语成绩比较差,词汇量比较小;同时又没有比较合适的教材和参考资料。因此,怎样改进教材建设,把握好高职英语教材,迅速提高高职学生的英语水平是全国大部分高职英语教师共同面对的一个课题。本文拟从高职英语教材的现状及问题、解决问题的对策等方面展开讨论。本文旨在通过一个单元的实践为例,从而寻找到高职英语课程教材模式的改革途径,为今后实践教学提供理论基础。 相似文献
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从分子水平研究了PEO-PPO-PEO嵌段共聚物聚集过程中分子基团微环境和构象的变化。FTIR光谱给出了温度、溶剂、嵌段共聚物组成等影响PEO-PPO-PEO嵌段共聚物胶团结构的定量信息。用无机盐和脂肪醇调控PEO-PPO-PEO嵌段共聚物聚集，荧光光谱技术提供了降低PPO链段与水的相互作用，推动嵌段共聚物在水中胶团化的证据。用水凝胶包埋PEO-PPO-PEO嵌段共聚物，实现了萃取水中低浓度多环芳烃的工艺循环。 相似文献
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《中国科学院院刊(英文版)》2008,22(4):204-204
Lithium batteries, as a main or back-up power source for mobile communication devices, portable electronic devices and the like, have attracted much attention in the scientific and industrial fields due to their high electromotive force and high energy density. To meet the demand for batteries with higher energy density and improved cycle characteristics in recent years, many attempts have been made to develop new electrode materials or design new structures of electrode materials. 相似文献
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“高分子材料”课程教学改革初探 总被引：2，自引：0，他引：2
“高分子材料”课程涵盖了高分子材料学科的基本理论、基本知识,典型高分子材料的制备与应用,是一门实践性和应用性非常强的专业课程。针对“高分子材料”课程的知识结构特点,提出在教学中如何从“传授知识”转向“开发智能”,结合高分子材料学科的发展动向,采用灵活多变、形式多样的教学方法,激发学生主动学习的兴趣,提升教学质量． 相似文献