【标题】Recent Progress in Poly (3,4-Ethylene Dioxythiophene): Polystyrene Sulfonate Based Composite Materials for Electromagnetic Interference Shielding
【参考中译】聚（3，4-乙撑二氧联苯）：聚苯乙烯磺酸盐基电磁干扰屏蔽复合材料的最新进展
【类型】 期刊
【关键词】 EMI shielding; Polymer composites; Intrinsically conducting polymers (ICPs); Microwave absorption (MA); PEDOT: PSS
【参考中译】 EMI屏蔽;聚合物复合材料;本征导电聚合物（ICPs）;微波吸收（MA）; PEDOT：CSS
【作者】 Govind Kumar Sharma; Sneha L Joseph; Nirmala Rachel James
【摘要】 Recent technological developments have made the emission of electromagnetic (EM) radiation a significant source of electromagnetic interference (EMI). These EMIs consist of stray EM radiations that damage and malfunction electronics and telecommunication systems. Scientists have made countless efforts to solve these problems. The demand for EMI shielding materials is fast growing due to the increasing complexity of the EM environment and EMI. Poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT: PSS) is an intrinsically conductive polymer that has attracted attention due to its high electrical conductivity, processability, and environmental stability. The use of PEDOT:PSS as a shielding material for EMI is a promising alternative to traditional metal-based materials. This review provides an overview of different strategies explored for the preparation of PEDOT: PSS-based composites for EMI shielding and the use of carbonic fillers, metal and metal nanoparticles, magnetic particles, and MXenes in these composites. The advantages and disadvantages of different approaches are discussed, and future perspectives for the development of PEDOT:PSS composites for EMI shielding are presented. The paper concludes that PEDOT-PSS-based composites offer significant potential for the development of lightweight, thin, flexible, and cost-effective green EMI shielding materials, and continued research in this field can lead to their widespread commercialization and adoption.
【参考中译】 最近的技术发展使电磁辐射的发射成为电磁干扰(EMI)的一个重要来源。这些电磁干扰由杂散电磁辐射组成，这些辐射会损坏电子和电信系统并使其发生故障。科学家们为解决这些问题做出了无数的努力。由于电磁环境和电磁干扰的日益复杂，对电磁屏蔽材料的需求正在快速增长。聚(3，4-乙二氧基噻吩基)：聚苯乙烯磺酸盐(PEDOT：PSS)是一种本征导电聚合物，因其高导电性、可加工性和环境稳定性而引起人们的关注。使用PEDOT：PSS作为电磁干扰屏蔽材料是一种很有前途的替代传统金属基材料的方法。本文综述了制备PEDOT：PSS基EMI屏蔽复合材料的不同策略，以及碳填料、金属和金属纳米粒子、磁性粒子和MXenes在这些复合材料中的应用。讨论了不同方法的优缺点，并对PEDOT：PSS电磁屏蔽复合材料的发展前景进行了展望。文章认为，PEDOT-PSS基复合材料为开发轻质、薄、柔性、低成本的绿色EMI屏蔽材料提供了巨大的潜力，该领域的持续研究将导致其广泛的商业化和应用。
【来源】 Advanced Materials Technologies 2024, vol.9, no.1
【入库时间】 2024/7/1
【标题】Study on improving the toughness of rapidly curing epoxy resin composite materials with a biobased microcrystalline cellulose
【参考中译】生物基超细纤维素提高快速固化环氧树脂复合材料韧性的研究
【关键词】 Epoxy resin; Mechanical property; Microcrystalline cellulose; Rapid curing
【参考中译】 环氧树脂;机械性能;微结晶纤维素;快速固化
【作者】 Xiaoke Bi; Guoying Liu; Lijun Cao; Ce Sun; Haiyan Tana; Yanhua Zhang
【摘要】 Rapid solidification molding is one of the main low-cost forming methods for composite materials, and the reasonable selection of the solidification molding process is the key to achieving material performance. The curing system used in this paper is the widely used, inexpensive, and readily available epoxy resin (WSR618) and the transparent, colorless, and less toxic 593 curing agent, which cures at room temperature. Through the study of various temperature formulations, a rapid curing system was determined that has a 10-min cure at 80℃. The results showed that when the mass ratio of epoxy (EP) resin to curing agent was 5:1, the curing system was selected at 80℃ for 10 min, and the bending strength could reach 100.19 MPa, and the impact strength could reach 12.82 kJ/m~2. However, the difficulty caused by quick solidification was a reduction in mechanical characteristics, which required modification. Microcrystalline cellulose is cheap and readily available and widely available, so microcrystalline cellulose (MCC) was chosen for modification in this study. The experimental results showed that the addition of MCC reduced the fracture brittleness of EP composite materials. When 0.75% MCC was added, the bending and tensile strengths reached 116.88 and 52.53 MPa, respectively, which were 16.66% and 18.74% higher than unmodified EP. The elongation at break reached 11.57%, which is 14.13% higher than unmodified.
【参考中译】 快速凝固成型是复合材料低成本成型的主要方法之一，合理选择凝固成型工艺是实现材料性能的关键。本文所使用的固化体系是应用广泛、价格低廉、易于获得的环氧树脂(WSR618)和透明、无色、无毒的593固化剂，可在室温下固化。通过对不同温度配方的研究，确定了快速固化体系，固化时间为10分钟，固化温度为80℃。结果表明，当环氧树脂与固化剂的质量比为5：1，固化体系为80℃，固化时间为10min时，其弯曲强度可达100.19 Mpa，冲击强度可达12.82kJ/m2，但快速固化带来的困难是力学性能下降，需要进行改性。由于微晶纤维素价格低廉，易于获得，应用广泛，因此本研究选择微晶纤维素(MCC)进行改性。实验结果表明，MCC的加入降低了EP复合材料的断裂脆性。当MCC含量为0.75%时，复合材料的弯曲强度和拉伸强度分别达到116.88和52.53 Mpa，比未改性的EP分别提高16.66%和18.74%。断裂伸长率达到11.57%，比未改性前提高14.13%。
【来源】 Polymers for Advanced Technologies 2024, vol.35, no.3
【标题】Thermal conductivity of three-dimensional multi-material core-shell filament structures obtained by material extrusion
【参考中译】材料挤压获得的三维多材料核壳丝结构的热传导性
【关键词】 Robocasting; Coaxial; γ-alumina; Graphene nanoplatelets; Thermal conductivity; Finite element methods
【参考中译】 机器人铸造;同轴; γ-氧化铝;石墨烯纳米片;热传导性;有限单元法
【作者】 L. Moreno-Sanabria; C. Ramirez; M. I. Osendi; M. Belmonte; P. Miranzo
【摘要】 Coaxial 3D structures based on ceramic materials with distinct properties are of great interest in a wide range of fields due to their enhanced ability to modulate structural and functional properties. In this work, 3D patterned structures based on bi-component filaments with a core-shell arrangement have been additively manufactured in a single step by material extrusion. A system has been designed consisting of two concentric syringes for simultaneous printing of pseudoplastic core and shell ceramic inks with a single pressure device. Aqueous boehmite and boehmite/graphene nanoplatelets (GNP) composite inks have been formulated. The rheology of both inks has been matched to ensure the printability and integrity of the boehmite (core)-composite (shell) layout and its reverse. The as-printed coaxial scaffolds have been treated at 500℃ for 2 h in nitrogen atmosphere to transform boehmite to γ-alumina while the GNP remain undamaged. The thermal properties and the heat transfer of these robust coaxial structures have been experimentally analysed using the transient pulse source method and a high-resolution infrared camera, respectively. Besides, they have been theoretically simulated by finite element methods. These coaxial architectures promote higher thermal anisotropy as compared to monomaterial scaffolds, allowing better control of the heat fluxes. The mechanical behaviour of the different lattice materials has been assessed through compression tests to calculate the strength and the apparent elastic modulus; and the fracture surface of the lattice struts after failure has also been examined.
【参考中译】 基于具有不同性质的陶瓷材料的同轴三维结构由于其增强的结构和功能特性的调节能力而在广泛的领域中引起了极大的兴趣。在这项工作中，通过材料挤压一步完成了基于核壳排列的双组分纤维的3D图案化结构的制造。设计了一种由两个同心注射器组成的系统，可以用一个加压装置同时打印假塑芯和壳陶瓷油墨。研制了水性薄水铝石和薄水铝石/石墨烯纳米板(GNP)复合油墨。两种油墨的流变性已经匹配，以确保薄水铝石(芯)-复合(壳)布局及其反面的可印刷性和完整性。印制的同轴支架在氮气气氛中于500℃下处理2 h，使薄水铝石转变为γ-Al_2O_3，而国民生产总值保持不变。分别用瞬变脉冲源方法和高分辨率红外相机对这些耐用同轴结构的热性能和热传递进行了实验分析。并用有限元方法对其进行了理论模拟。与单材料支架相比，这些同轴结构促进了更高的热各向异性，从而允许更好地控制热通量。通过计算强度和表观弹性模数的压缩试验，对不同格子材料的力学性能进行了评价，并对破坏后的格子杆断口进行了分析。
【来源】 Additive Manufacturing 2024, vol.81