【标题】Special issue "MatCom-ComMat: Materials Compounds from Composite Materials for Applications in Extreme Conditions"
【参考中译】特刊“MatCom-ComMat：极端条件下应用的复合材料化合物”
【类型】 期刊
【作者】 Martin Heilmaier
【摘要】 This special issue comprises a total number of 14 manuscripts generated during the first period of the DFG funded research training group (RTG) 2561 MatCom-ComMat. The RTG is composed of research groups from the three institutions Dechema Research Institute Frankfurt, Technical University of Darmstadt and Karlsruhe Institute of Technology.
【参考中译】 这期特刊包含DFG资助的研究培训小组（RTG）2561 MatCom-ComMat第一期期间产生的总共14篇手稿。RTG由法兰克福德切马研究所、达姆施塔特工业大学和卡尔斯鲁厄理工学院这三个机构的研究小组组成。
【来源】 Advanced Engineering Materials 2024, vol.26, no.17
【入库时间】 2025/1/24
【标题】Modeling the Solvolysis of Composite Materials of Wind Turbine Blades
【参考中译】风力涡轮机叶片复合材料溶剂分解建模
【关键词】 Recyclable composites; Solvolysis; Sustainability; Wind energy
【参考中译】 可回收复合材料;溶剂分解;可持续性;风能
【作者】 Yi Chen; Leon Mishnaevsky
【摘要】 A computational model of the depolymerization of composites during solvolysis of wind turbine blades is developed. The model is based on a phenomenological approach, describing the dissolution of an epoxy matrix as a local phase transition influenced by temperature, solvent diffusion, and local microstructures. The model is implemented in the finite element code Abaqus, using the user-defined field and heat flux subroutines. Parametric studies are carried out to study the influence of defects and heterogeneities on the depolymerization of composite materials. The results show that variations of the solvent diffusivity in the vicinity of fiber/matrix lead to nonhomogeneity of depolymerization, and smaller diffusivity may explain matrix residues remaining on the fibers. Fiber volume density and distribution influence the polymer dissolution rate because the resistance to solvent diffusion arises between fibers. Further, voids in the polymer may lead to a local acceleration of the polymer dissolution. This work also looks into the contributions of diffusion and reaction to depolymerization, and the former dominates. The rate and homogeneity of depolymerization, therefore, depend significantly on the manufacturing quality of composites.
【参考中译】 建立了风力机叶片溶解过程中复合材料解聚的计算模型。该模型基于唯象方法，将环氧树脂的溶解描述为受温度、溶剂扩散和局部微观结构影响的局部相变。该模型是在有限元程序ABAQUS中实现的，使用了用户定义的场和热流子程序。用参数法研究了缺陷和非均质性对复合材料解聚的影响。结果表明，纤维/基质附近的溶剂扩散系数的变化导致了解聚反应的不均匀，较小的扩散系数可能是残留在纤维上的基质残留的原因。纤维的体积密度和分布会影响聚合物的溶解速度，因为纤维之间会产生溶剂扩散的阻力。此外，聚合物中的空隙可能导致聚合物的局部加速溶解。这项工作还考察了扩散和反应对解聚的贡献，前者占主导地位。因此，解聚的速度和均匀性在很大程度上取决于复合材料的制造质量。
【来源】 Advanced Engineering Materials 2024, vol.26, no.16
【标题】Experimental investigations to measure thermodynamic properties of MWCNT/MnCl_2 composite material for thermochemical energy storage system
【参考中译】热化学储能系统MWTNT/MnCl_2复合材料热力学性质的实验研究
【关键词】 Thermochemical energy storage system; MWCNT; MnCl_2; Thermodynamic properties; Ammonia adsorption/desorption
【参考中译】 热化学储能系统; MWTNT; MnCl_2;热力学性质;氨吸收/脱附
【作者】 Siva Subrahmanyam Mendu; Anil Kumar Emadabathuni; AnilKumar Sannapareddy; Sarat Babu Kaki
【摘要】 Thermal energy is abundant in the form of solar energy and can be stored to meet the demands of many applications. There are many methods for storing thermal energy, but thermochemical energy storage devices are the most efficient among the available options. Materials and their properties must be explored to develop such systems. The focus of this research is to develop and test the thermodynamic properties of thermochemical composite materials based on the metal halide salts MnCl_2 and MWCNT during ammonia adsorption and desorption. During the initial development stage, the composite material was characterised using XRD and BET. Later, an experimental set-up was fabricated to measure pressure concentration isotherms during ammonia adsorption and desorption. In the final phase, the Von't Hoff equation is used to calculate the enthalpy and entropy of the reaction. The average adsorption enthalpy and entropy, according to the results, are 39.21 kJ/mol and 0.111 kJ/mol K, respectively. The average desorption enthalpy and entropy are 85.83 kJ/mol and 224 kJ/mol K. The maximum hysteresis between ammonia adsorption and desorption was determined to be 2.74. Finally, the energy storage density is calculated at different temperatures. These properties are important for designing a thermochemical energy storage system.
【参考中译】 热能以太阳能的形式丰富，可以储存起来，以满足许多应用的需求。储存热能的方法有很多，但热化学储能装置是可用选择中最有效的。为了开发这样的系统，必须探索材料及其性能。本研究的重点是开发和测试基于金属卤化物MnCl2和MWCNT的热化学复合材料在氨吸附和脱附过程中的热力学性质。在初始开发阶段，用X射线衍射仪和BET对复合材料进行了表征。随后，建立了一套实验装置来测量氨吸附和解吸过程中的压力浓度等温线。最后用Von‘t-Hoff方程计算了反应的焓和熵，得到的平均吸附热焓和平均吸附熵分别为39.21kJ/m ol和0.111 kJ/m ol K，平均脱附热和平均脱附熵分别为85.83kJ/m o l和224kJ/m ol K，氨吸附-脱附的最大滞后为2.74。最后，计算了不同温度下的储能密度。这些性质对热化学储能系统的设计具有重要意义。
【来源】 IJIDeM 2024, vol.18, no.6