Materials Literature
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Abstract The advent of composite materials and the knowledge acquired in the recent years in this area has increased the performance of the aeronautical industries' products. As the structural applications for fiber‐reinforced polymeric composites continue to increase, so too does the need for a thorough understanding…
Abstract The most pressing requirements in the present and future predictable scenarios for materials and technologies, concern energy saving, natural resources preservation, and minimization of environmental impact. Composite polymer materials can play a major role in energy saving in the transport sector which is of…
Abstract Carbon nanotubes (CNTs) have excellent mechanical, electrical, and thermal properties, and they are considered to be potential ideal fillers in polymers to produce low weight nanocomposites of high performance. This article reviews the thermal, rheological, mechanical, and electrical properties of CNT polymer…
Abstract The incorporation of nanoparticles in polymer matrices leads to improvements in several physical properties. As a result, nanocomposites have the potential to be used in various fields such as medical devices, automotive and aerospace applications, packaging, and building materials. This article attempts to d…
Abstract The issue of environmental resistance of polymer matrix composites (PMC) is addressed focusing on the effects of low molecular weight (m.w.) compounds, including moisture. Sorption thermodynamics and mass transport of low m.w. compounds is first reviewed with reference to neat polymer matrices, illustrating F…
Abstract Wood‐plastic composites (WPCs) may be one of the most dynamic sectors of the present day plastic industry. Although the technology is not new, there is growing interest in the new design possibilities that this marriage of materials offers. The formulation variations of WPCs that increase wood content offer e…
Abstract Ablative materials play a strategic role in the aerospace industry. The concept of ablation can be related to a geological term at least 160 years old. It is derived from the suppletive past participle of the Latin “auferre” which means to carry away. Ablative materials are used to produce the thermal protect…
Advancements in the semiconductor industry have lead to the miniaturization of components and increased power densities, resulting in thermal management issues. In response to this shift, finding multifunctional materials with excellent thermal conductivity and tailored electrical properties are becoming increasingly…
Abstract One of the major contributions of phenolic resins is their use as a matrix in fiber‐reinforced composites to prepare materials with low fire‐smoke toxicity coupled with favorable economics and excellent properties. New formulations became available in the 1980s and were developed mainly to meet requirements o…
Abstract This article discusses the development of polymer–polymer composites, including the fundamental sciences such as the design principles and mechanisms, as well as their preparation techniques and potential application areas. The advantages of such self‐reinforced composite (SRC) systems include the achievement…
Abstract Phthalonitrile resins are a type of high temperature/performance polymers having a wide range of potential applications such as composite matrices, adhesives, electrical conductors and carbon precursors. Polymerization of these resins occurs through cyano groups on phthalonitrile units by an addition cure mec…
采用二乙烯基苯-55(DVB-55)和乙二醇二甲基丙烯酸酯(EGDMA)作为混合交联剂,乙腈为溶剂,偶氮二异丁腈(AIBN)为引发剂,以甲基丙烯酸为功能单体采用沉淀聚合法合成了单分散或窄分散的、表面具有羧基的交联聚合物微球,所得微球的粒径变化范围为0.6~3.8 m.通过调节交联剂DVB-55和EGDMA的投料比,可以对微球的粒径、粒径分布、产率、热稳定性以及表面官能团含量进行有效控制.文中对混合交联剂DVB-55与EGDMA比例的改变对微球的粒径、粒径分布以及产率的影响机理给出了理论解释;对DVB和EGDMA的兼容性研究表明,制备的三元聚合物微球的核拥有比投料比稍多的DVB单元,而微球的外层则以在预聚混合物中占更大比例的交联剂为…
GaN-based light emitting diodes (LEDs) with interconnecting indium tin oxide (ITO) nanowires were fabricated using self-assembled NaCl particles as etching masks. Compared to conventional LEDs with a planar ITO layer, it was found that the light output power (LOP) of the LEDs with a ITO layer with interconnecting nano…
Aim. is the major metabolite of an environmental carcinogen, polycyclic aromatic hydrocarbon benzo[a]pyrene.The effects BPDE could have on neuronal cells progenitors are mostly uncharacterized.Methods.We have studied survival and morphology of cultured PC12 cells and mouse embryonic hippocampal neurons in the presence…
由共沉淀法和Stober法制备了伯胺基功能化SiO2稳定的Fe3O4磁性纳米粒子Fe3O4@SiO2-NH2;Fe3O4@SiO2-NH2与二异氰酸酯及咪唑阳离子二醇、聚乙二醇的反应使其表面形成阳离子型聚氨酯稳定层;通过阳离子型聚氨酯与CdTe量子点表面修饰的巯基乙酸间的电荷相互作用,制备得到了Fe3O4/CdTe/聚氨酯纳米复合物.用X射线衍射(XRD)、红外吸收光谱(FTIR)、热重分析(TGA)、透射电子显微镜(TEM)、磁强计(VSM)、紫外吸收光谱(UV)、荧光发射光谱(PL)表征了该纳米复合物的结构与性能.结果表明,CdTe量子点均匀地分散在Fe3O4@SiO2磁性纳米粒子周围,所得纳米复合物在溶剂中分散均匀,不团聚,…
研究了炭黑或碳纤维填充氧化铝/二氧化硅吸波涂层在X波段范围的介电和吸波性能. 结果表明: 吸波涂层的复介电常数随着炭黑或碳纤维含量的增加而增大. 当吸收剂含量相同时, 填充碳纤维的吸波涂层比填充炭黑的吸波涂层具有更大的复介电常数. 当吸收剂含量大于5wt%时, 吸波涂层的介电常数在低频急剧增加, 且随频率增大而减少, 出现频散效应. 反射率测试结果表明: 吸波涂层的最大吸收峰随涂层厚度的增大向低频移动, 当涂层中炭黑含量为2wt%、厚度为1.8 mm时, 吸波涂层在9.2~12.4 GHz范围内反射率小于-10 dB, 具有较好的吸波效果.
Highly C‐axis oriented ZnO thin film was manufactured by radio‐frequency magnetron sputtering technique on Si (111) substrate. The main objective was to study the influence of rapid thermal annealing (RTA) temperature on the structure and interfacial characteristic of ZnO thin films. X‐ray diffraction results showed t…
Microwave absorbability of electromagnetic waves in the frequency range of 1–15 GHz, which is often used in recent wireless applications, for stacks of various numbers of conductive nonwoven fabric sheets with different resistivity was evaluated to clarify their possibility as the broadband microwave absorber in the f…
Abstract The intermolecular interaction is ubiquitous and influences the results of virtually every chemical or physical experiment. There are some important questions left in the theory of intermolecular interaction. One of such questions is: what kind of objects do interact. In the article, we recall a kind of unusu…
A fundamental T-branch in one-dimensional photonic crystal waveguides based on the omnidirectional reflection is constructed. Numerical simulations of this T-branch indicate that without any structural optimization, four high reflectance peaks and three high transmittance peaks appear alternately within a wide enough…