Integration of flexible capacitive sensors in polymers for monitoring of polymerization and degradation processes.

将柔性电容传感器集成到聚合物中，用于监测聚合和降解过程。

• 批准号: 271616017
• 负责人: Professor Dr.-Ing. Axel Herrmann
• 金额: --
• 依托单位: Faserinstitut Bremen e.V. (FIBRE)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/271616017?language=en
• 关键词: Integration; flexible; capacitive; sensors; polymers

Online-Process-Monitoring (OPM) has the potential to extend the area of application of fibre reinforced polymers by reducing processing times and costs while increasing the quality. It is important to monitor the consolidation process, especially the curing process, since it is not always homogenous in the whole fabricated part. Therefore, sensors should be integrated in the material to monitor the fabrication process inside the laminate. Hence, it is necessary that the sensors withstand the fabrication process and do not influence the functionality of the produced part. To fulfil this goal, a miniaturized flexible dielectric sensor was developed within the project “Integration of Flexible Capacitive Sensors in Polymers for Polymerization and Degradation Monitoring”. The sensors were embedded in carbon fibre reinforced thermosetting polymers and the curing process was successfully monitored. Furthermore, the influence of the sensor on the mechanical integrity of the produced part was investigated. Quasistatic tests were used to demonstrate that the sensor does not significantly degrade the mechanical properties of the material. Within the scope of this project, the curing of thermosets as matrix material was investigated. Beside thermosets, thermoplastics are used in the fibre reinforced polymer production. Thermoplastics have the advantage that the production process can be considerably faster. One important consideration in terms of industrial application is that it is possible to reduce the manufacturing cycle time by using thermoplastics. Furthermore they can be remelted, which allows for repairing and recycling defect parts. During the curing process of thermosets, the polymer chains crosslink and covalent bonds are created. On the contrary, the polymer chains of thermoplastics do not crosslink but they can be aligned to each other. The ratio between aligned and amorphous regions is called degree of crystallization. This degree determines the mechanical and thermal properties of the material and can be adjusted by varying the process parameters. Therefore, the degree of crystallization should be measured online during the fabrication process of the fibre reinforced polymers using dielectric sensors and optical fibres.The goal of the project is to monitor the crystallization of thermoplastics during the fabrication process of fibre reinforced plastic composites, especially to measure and control as accurate as possible the degree of crystallization and the load transfer point to determine the solidification point inside the material.In parallel to the miniaturized dielectric sensors, optical fibre sensors should also be embedded in order to cover a broader electromagnetic spectrum. The combination of both measurement principles increases the amount of information significantly, which helps determining a suitable model for the evaluation of the process.

在线过程监控（OPM）有可能通过减少加工时间和成本来扩展纤维增强聚合物的应用领域，同时提高质量。监控固结过程，特别是固化过程非常重要，因为它。在整个制造部件中并不总是均匀的，因此，传感器应集成在材料中以监控层压板内部的制造过程，因此传感器必须能够承受制造过程并且不会影响所生产部件的功能。 。 实现为了实现这一目标，“用于聚合和降解监测的聚合物中柔性电容传感器的集成”项目开发了一种微型柔性介电传感器，该传感器被嵌入到碳纤维增强热固性聚合物中，并成功监测了固化过程的影响。使用准静态测试来研究传感器对所生产部件的机械完整性的影响，以证明该传感器不会显着降低该项目范围内的材料的机械性能。除了热固性材料之外，热塑性塑料还用于纤维增强聚合物的生产，其优点是生产过程可以显着加快，这是工业应用中的一个重要考虑因素。此外，它们可以重新熔化，从而可以修复和回收有缺陷的部件。在热固性材料的固化过程中，聚合物链会发生交联并形成共价键。热塑性塑料不会交联，但它们可以相互排列，这种程度决定了材料的机械和热性能，并且可以通过改变工艺参数来调整。应使用介电传感器和光纤在纤维增强聚合物的制造过程中在线测量结晶度。该项目的目标是在纤维增强塑料复合材料的制造过程中监测热塑性塑料的结晶，特别是要尽可能准确地测量和控制结晶度和载荷传递点，以确定材料内部的凝固点。与小型化介电传感器并行，还应嵌入光纤传感器，以覆盖更广泛的电磁频谱两种测量原理的结合显着增加了信息量，这有助于确定合适的过程评估模型。

项目成果

Sensor Integration in Fiber‐Reinforced Polymers

• DOI: 10.1002/9783527679249.ch7
• 发表时间: 2017-12
• 作者: M. K. Moghaddam;M. Salas;M. Koerdt;C. Brauner;M. Hübner;D. Lehmhus;W. Lang

Online monitoring of thermoplastic crystallization with miniaturized interdigital sensors

使用小型叉指传感器在线监测热塑性塑料结晶

• DOI: 10.1109/sensors47125.2020.9278800
• 发表时间: 2020
• 期刊: 2020 IEEE Sensors
• 作者: Hübner;Koerdt
• 通讯作者: Koerdt

Materialintegrierte Sensorik für Fahrzeug-Leichtbautechnik

用于轻型车辆构造技术的材料集成传感器

• DOI: 10.1007/978-3-662-48944-4_10
• 发表时间: 2016
• 作者: Hübner;Moghaddam;Dumstorff
• 通讯作者: Dumstorff

Sensors on a plasticized thermoset substrate for cure monitoring of CFRP production

• DOI: 10.1016/j.sna.2017.10.007
• 发表时间: 2017-11-01
• 期刊: SENSORS AND ACTUATORS A-PHYSICAL
• 影响因子: 4.6
• 作者: Moghaddam, M. Kahali;Huebner, M.;Lang, W.
• 通讯作者: Lang, W.

Smart fiber-reinforced polymer composites and their resource-efficient production by means of sensor integration

智能纤维增强聚合物复合材料及其通过传感器集成的资源高效生产

• DOI: 10.1515/9783110584455-012
• 发表时间: 2021
• 期刊: Frontiers of Science and Technology
• 作者: Koerdt;Hübner;Kahali Moghaddam;Herrmann
• 通讯作者: Herrmann