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超细SiO2微粒的表面接枝聚合改性研究进展 总被引:7,自引:1,他引:7
综述了超细SiO2微粒表面接枝聚合改性技术的原理以及近年来超细SiO2微粒表面接枝聚合改性的研究进展。讨论了自由基、阳离子和阴离子接枝聚合改性的优缺点。着重介绍了一种极具发展前景的接枝聚合改性方法——ATRP技术。 相似文献
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聚合物光接枝表面改性的方法和影响因素 总被引:1,自引:0,他引:1
简要介绍了聚合物光接枝表面改性的方法,并分析了聚合物光接枝表面改性的几种方法,着重分析了基体、接枝单体、光敏剂、溶剂、接枝方法、温度和光照时间等因素对聚合物光接枝表面改性的影响。 相似文献
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表面光接枝主要是用芳酮引发有机材料产生自由基,从而引发单体聚合产生表面接枝链。表面光接枝应用领域广泛.可用于聚合材料的表面改性以及表面功能化。综述了紫外光引发接枝改性聚合物表面的研究进展,包括光接枝聚合机理、改性方法、影响因素等,并对其应用前景及研究方向进行了介绍。 相似文献
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简述了大分子表面改性剂添加到聚烯烃基体中时接触介质的诱导作用和聚烯烃基体结晶的异质排斥作用及其相对分子质量、链节的柔顺性和与基体的相容性对其表面富集的影响。提出大分子表面改性剂设计合成的基本原则:化学结构和使用环境相匹配、憎水基功能团和亲水基功能团相适应、使用效率和功能持久性相平衡。介绍了大分子表面改性剂合成的主要方法。 相似文献
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《大分子材料与工程》2017,302(11)
Biomaterials for in vivo application should induce positive interaction with various histocytes and inhibit bacteria inflection as well. Cells and/or bacteria response to the extracellular environment is therefore the basic principle to design the biomaterials surface in order to induce the specific biomaterial–biological interaction. Polyhydroxyalkanoate (PHAs) are of growing interests because of their natural origin, biodegradability, biocompatibility, and thermoplasticity; however, quite inert and intrinsic hydrophobic characteristics have hindered their extensive usage in medical applications. Surface modification of PHAs tailors the chemistry, wettability, and topography without altering the bulk properties, and introduces specific proteins/peptides and/or antibacterial agents to mediate cell–matrix interactions. This review describes the recent developments on the surface modification of PHAs to construct cell compatible and antibacterial surfaces. 相似文献
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In this paper the effects of surface energy and surface roughness on the deposition of calcium sulphate during convective and subcooled flow boiling heat transfer to aqueous CaSO4 solutions are studied. The surfaces of several test heaters have been treated by Ion Beam Implantation, Unbalanced Magnetron Sputtering, Mixed Sputtering and Plasma Arc Deposition to reduce surface energy. One heater was electropolished to reduce surface roughness and one heater was etched by an electrochemical method to increase surface roughness. Fouling runs with these heaters, and with an untreated surface as control, were carried out at different heat fluxes, flow velocities and salt concentrations. The results show that heat transfer surfaces with low surface energy experienced significantly reduced fouling, while electropolishing did not have a notable beneficial effect. The combined effect of reduced surface energy and flow velocity on fouling reduction is considerably stronger than previously reported for pool boiling. 相似文献
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高速气流冲击式粉体表面改性装置——HYBRIDIZATION系统及应用 总被引:4,自引:0,他引:4
利用高速气流冲击法进行粉体/粉体系表面改性技术,是迄今为止各种粉体材料开发中最为引人注目的技术之一。HYBRIDIZATION(下称HYB)系统是利用高速气流冲击法对微粉体进行干式/机械化处理,是使材料复合化的最实用的装置,可对各类有机物、无机物、金属等进行广泛组合,通用性很强,适用于许多行业领域。从本文所述的系统构成、型式,有关的典型球形化处理的运转特性,利用复合化高温粉体测定被处理粉体表面温度,利用颜料改变色调等的处理特点及该系统的适用性等(一部分是从已发表的学术论文及专利上摘录的),可以说明HYB系统的概况。 相似文献
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低温等离子体对F24表面处理的研究 总被引:7,自引:1,他引:6
本文通过失重、交联.接触角、表面能及剪切强度测定等方法研究了在不同等离子理条件下,F24在处理前后表面结构性能的变化.结果表明,处理后的F24润湿性和粘接性能有明显改善,较未处理时接触角下降约20°左右,剪切强度较未处理的提高二倍多. 相似文献
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随着科学技术的不断发展与进步,飞机、高铁等已经成为人们日常出行的首选交通工具。然而由于速度的提高,对其中关键零部件配副的摩擦学性能的要求也越来越高,传统的材料或者加工方法已达不到要求。因此需要对材料表面进行改性。而表面织构技术可以有效的模仿自然界中超疏水植物叶片的表面结构,使得在材料表面实现自润滑效果,减少摩擦带来的耗损。基于此,主要介绍了自然界具有疏水性能的生物表面结构、织构化对金属表面、聚合物表面摩擦学性能的影响,并结合表面织构对材料表面的摩擦学性能影响研究现状,对表面织构技术对聚合物的摩擦学性能影响,以及减磨机理的研究做出了相应的展望。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(10):1051-1063
Oxygen plasma treatment as a surface functionalization technique is discussed. Oxygen-containing functionalities were introduced on the surface of high- (HDPE) and low-density polyethylene (LDPE) by glow discharge. The number of surface hydroxyl groups was increased by a post-discharge wet treatment in a reducing solution. The effects of the substrate nature, the discharge parameters, and the post-discharge wet treatment on the surface functional groups are discussed, and the effectiveness of functionalized surfaces on the yield of coupling reactions is shown. 相似文献