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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。

基本信息

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

项目摘要

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）通过减少加工时间和成本，同时提高质量，有可能扩大纤维增强聚合物的应用领域。重要的是要监测固结过程，特别是固化过程，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，并且不影响所生产部件的功能。为了实现这一目标，在项目“聚合物中柔性电容传感器的集成用于聚合和降解监测”中开发了小型化柔性介电传感器。传感器被嵌入碳纤维增强热固性聚合物中，并成功地监测了固化过程。此外，传感器的机械完整性的生产的一部分的影响进行了研究。准静态测试用于证明传感器不会显著降低材料的机械性能。在本项目范围内，研究了热固性材料作为基质材料的固化。除了热固性塑料外，热塑性塑料也用于纤维增强聚合物的生产。热塑性塑料的优点是生产过程可以相当快。在工业应用方面的一个重要考虑是，通过使用热塑性塑料可以减少制造周期时间。此外，它们可以重新熔化，这允许修复和回收缺陷部件。在热固性材料的固化过程中，聚合物链交联并产生共价键。相反，热塑性塑料的聚合物链不交联，但它们可以彼此对齐。取向区域和非晶区域之间的比率称为结晶度。该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进行调整。因此，在纤维增强塑料复合材料的制备过程中，需要利用介电传感器和光纤对纤维增强塑料的结晶度进行在线测量。本项目的目标是在纤维增强塑料复合材料的制备过程中监测热塑性塑料的结晶度，特别是尽可能精确地测量和控制结晶度和载荷转移点以确定凝固点与小型化介电传感器平行，还应嵌入光纤传感器，以覆盖更广泛的电磁频谱。这两种测量原理的结合显著增加了信息量，这有助于确定用于评估过程的合适模型。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Sensor Integration in Fiber‐Reinforced Polymers

DOI：
10.1002/9783527679249.ch7
发表时间：
2017-12
期刊：
影响因子：
0
作者：
M. K. Moghaddam;M. Salas;M. Koerdt;C. Brauner;M. Hübner;D. Lehmhus;W. Lang
通讯作者：
M. K. Moghaddam;M. Salas;M. Koerdt;C. Brauner;M. Hübner;D. Lehmhus;W. Lang

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