Marín-Genescà Marc, Mujal-Rosas Ramon, García-Amorós Jordi, Mudarra Miguel, Ramis Juan Xavier, Colom Fajula Xavier
Mechanical Engineering Department, Escola Tècnica Superior d'Enginyeria Química, Rovira i Virgili University, 43007 Tarragona, Spain.
Electrical Engineering Department, Escola d'Enginyeria de Terrassa, Technical University of Catalonia, 08222 Terrassa, Spain.
Polymers (Basel). 2021 Feb 8;13(4):509. doi: 10.3390/polym13040509.
The recycling and disposal of disused tires is a topic of great concern to today's companies, researchers, and society in general. In this sense, our research aims to recycle end-of-life tires (GTRs) through the separation of the fraction of vulcanized rubber from the other compounds in order to later grind this fraction and separate it into lower particle sizes. Finally, we aim to incorporate these GTR particles as a filler of an ethylene-polyethylene-diene monomer (EPDM). The obtained composites with EPDM and GTR are tested (5%, 10%, 20%) comparing these values with neat EPDM as a control sample. Thermal tests such as differential calorimetry (DSC) and thermogravimetric analysis (TGA) as well as dielectric tests (DEA) are performed in order to characterize these materials and check their viability as dielectric or semiconductor, for industrial use. It is checked how the presence of GTR increases functional properties such as conductivity/permittivity. The influence of temperature (40 to 120 °C) and addition of GTR particles in electrical properties has also been analyzed. The dielectric behavior of these composites is fully characterized, analyzing the different types of relaxation with increasing frequency (10 mHz to 3 MHz), using the electric modulus, and Argand diagrams among other measures. The influence of GTR and temperature in the dielectric and thermal behavior of these materials has been analyzed, where CB of GTR creates interfacial polarization phenomena in the dielectric behavior of the composite and increases the permittivity (real and imaginary) as well as the conductivity. Finally, with these obtained properties, the possible application of EPDM/GTR composites as industrial dielectrics has been studied.
废旧轮胎的回收与处理是当今企业、研究人员以及整个社会都极为关注的话题。从这个意义上讲，我们的研究旨在通过将硫化橡胶部分与其他化合物分离来回收废旧轮胎（GTRs），以便随后研磨该部分并将其分离成更小的颗粒尺寸。最后，我们旨在将这些GTR颗粒作为乙烯 - 聚乙烯 - 二烯单体（EPDM）的填料。对获得的含EPDM和GTR的复合材料进行测试（5%、10%、20%），并将这些值与纯EPDM作为对照样品进行比较。进行了差示量热法（DSC）和热重分析（TGA）等热测试以及介电测试（DEA），以表征这些材料并检查它们作为工业用介电体或半导体的可行性。研究了GTR的存在如何提高诸如电导率/介电常数等功能特性。还分析了温度（40至120°C）和GTR颗粒添加对电性能的影响。通过使用电模量和阿尔冈图等方法，随着频率增加（10 mHz至3 MHz）分析不同类型的弛豫，全面表征了这些复合材料的介电行为。分析了GTR和温度对这些材料介电和热行为的影响，其中GTR的炭黑在复合材料的介电行为中产生界面极化现象，并增加了介电常数（实部和虚部）以及电导率。最后，基于这些获得的性能，研究了EPDM/GTR复合材料作为工业介电体的可能应用。
