共查询到19条相似文献,搜索用时 78 毫秒
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聚合物/层状无机物纳米复合材料的研究进展 总被引:32,自引:0,他引:32
介绍了适于制备有机/无机纳米复合材料的层状无机物的类型和有机物嵌入到层状无机物夹层中的影响因素;总结了聚合物/层状无机物纳米复合材料的制备方法、结构与性能特征及潜在的应用前景。 相似文献
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复合材料用几种新型树脂研究进展 总被引:1,自引:0,他引:1
本文介绍了作为先进复合材料的几种新型树脂基体的进展,预浸料的制备方法,纤维增强复合材料的性能。本文所涉及的预浸方法具有如下优点:适于不同体系的树脂,预浸料树脂含量均匀,生产效率高等。 相似文献
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生物复合材料的细观结构和仿生复合材料的研究 总被引:3,自引:0,他引:3
利用扫描电镜(SEM)和光学显微镜对蝉,金龟子等昆虫的外甲壳的细肌结构进行了仔细的观察研究和强韧化的要理分析,并与人工合成复合材料进行比较,总结出可能对设计制造新型人工合成复合材料有益的启示。研究表明昆虫的外甲壳是一种由几丁质纤维和蛋白质(硬化或半硬化的)基体粘合形成的层状复合春层合方式有同向,正交,单,双螺旋等多种形式;纤维的形状,尺寸,以有妄动厚和叠层数是变化的,在可能产大外力的地方往往具有较 相似文献
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熔融插层制备聚合物-层状硅酸盐纳米复合材料研究进展 总被引:9,自引:0,他引:9
概述了近年来国内外聚合物—层状硅酸盐纳米复合材料(PLSN)制备领域的研究状况,详细评述和分析了PLSN熔融插层法的特点,指出熔融插层是一种高效和可行的制备聚合物—层状硅酸盐纳米复合材料的方法。 相似文献
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层状双金属氢氧化物(LDH)是一种近年来被广泛关注的阴离子型粘土,它在高分子纳米复合材料(PNC)领域拥有非常广阔的应用前景。已有的研究证实,LDH对聚合物的热稳定性,机械性能,阻燃性能等诸多性能都有影响。目前,制备LDH/PNC的方法主要有4种:溶液插层法,原位聚合法,熔融插层法和模板合成法。以这4种制备方法为基础,介绍了LDH/PNC的制备方法,总结了LDH对聚合物性能的影响,评价了LDH在PNC领域的应用前景。 相似文献
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A series of superior properties will make composites the most important structural materials in thenext century.But they are difficult to design owing to the complexity of structure and processing.Biomaterials had been naturally selected and evolved for millions of years,a great variety of their ra-tional composite structures could be taken as our reference in the biomimetic design of compositematerials.There are many difficult problems in the current study on composite materials such as:brittleness of continuous fibers and difficulties in interface design;easy pull-out of short fibers frommatrix causing failure in reinforcing;being less easy in selecting the aspect ratio of whiskers and dif-ficulties in finding the way of toughening composites of ceramic matrices as well as the way of heal-ing inner damages.After describing the distinct composite features,the functional adaptability andself-healing ability of biomaterials,several examples o.f biomimetic design of composite materialshave been listed in this paper:the optimum design of composites simulating bamboo structure;thefine structure of bamboo fibers;the dumb-bell model simulating animal bone;the model on thepull-out of fiber with fractal-tree structure and some tentative works on the healing of inner damagein composite materials The methodology of biomimetic design and its future have been given at theast part of this paper. 相似文献
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复合材料层合板准静态压痕损伤研究 总被引:2,自引:0,他引:2
本文对复合材料层合板准静态横向压缩特性损伤进行了研究.在损伤模拟过程中采用机体开裂和分层扩展判据,分类考虑了不同的损伤形式,通过修正损伤层的材料常数来模拟层板损伤所造成的局部刚度下降对横向压痕过程的影响.损伤模拟结果与超声C扫描的结果吻合较好. 相似文献
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以碳化后的梧桐木块作为碳模板,采用金属锆作为锆源,在KCl和KF的混合熔盐体系中制备了多孔ZrC/C复合陶瓷材料。研究了不同碳化温度对碳模板的显微形貌、显气孔率和体积密度的影响。并采用X射线光电子能谱(XPS)、傅里叶变换红外光谱(FTIR)、X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征了梧桐木的碳化过程以及复合材料的物相组成和显微形貌。结果表明:梧桐木的碳化分为有机物的热分解和石墨化两个过程;碳化后的梧桐木保留了多孔的特征结构,随着碳化温度的升高,碳模板显气孔率变大,体积密度减小;反应时间的延长有利于增强ZrC层与碳模板基体表面的结合力;KF的加入量需要严格控制,过量的KF会破坏复合材料的结构。 相似文献
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由肿瘤、炎症及各类创伤而导致的骨组织坏死、病变、缺失及骨折是临床多发病症,自体骨移植虽然是临床治疗的“金标准”,但由于供体受限而很难满足需求。通过对天然骨本身的成分、结构特性及矿化过程的模仿,应用先进材料制备技术,特别是纳米技术,对材料的组成、结构进行设计与凋控,获得仿生型骨修复材料或者对传统材料进行仿生功能化修饰,以满足临床对痫损或缺失的骨组织进行有效修复和功能重建具有重要意义。阐述了仿生功能化骨修复材料的相关研究,主要包括类骨钙磷纳米矿物的合成,有机分子摸板对纳米矿物尺寸和形貌的调控,以及仿生多孔结构支架的构建等。 相似文献
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复合材料层合矩形板非线性湿热振动 总被引:1,自引:1,他引:0
在考虑湿热影响的基础上,研究了复合材料层合矩形板的非线性湿热振动,并讨论分析了湿度、温度、长宽比对复合材料层合矩形板非经性固有振动周期的影响。 相似文献
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On the Viscoelastic Response of Composite Laminates 总被引:1,自引:0,他引:1
The present work deals with the determination of theviscoelastic properties of composite laminates based on the viscoelasticbehaviour of the single lamina. A viscoelastic lamination theory isdeveloped assuming that the lamina stiffness matrix is fully complex andfrequency dependent.For the measurement of the complete setof frequency dependent viscoelastic properties of the single lamina(i.e. complex moduli and Poisson's ratio) a new methodology has beenintroduced, based on the free and forced vibration of unidirectional and[45/–45]
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composite laminates.Allmeasurements have been performed both in air and in vacuum. Since thevibration amplitude was very small, in order to fulfil linearityrequirements, the results do not show any significant difference due toair damping.The effects of experimental errors on theevaluation of the viscoelastic properties of the single lamina have alsobeen discussed. 相似文献
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This article concerns certain aspects of the time-dependent response ofcross-ply polymeric composites consisting of stitched graphite fiberstrands embedded in urethane resin. Experimental data were collected atseveral levels of stress and temperature, as well as at various loadorientations. The time-dependent strains were shown to consist of thesum of a fully recoverable viscoelastic component and a permanentportion, which could be expressed empirically. The utility andshortcomings of the power-law creep form are being examined, suggestingthat its validity for making long term predictions may require that`short time' data must be collected over durations that exceed a certaintime-span.The article presents several results that demonstrate thepredictive capabilities of some of the formulations employed therein. 相似文献