Loos Klara, Bruère Vivianne Marie, Demmel Benedikt, Ilmberger Yvonne, Lion Alexander, Johlitz Michael
Institute of Mechanics, Bundeswehr University Munich, 85579 Neubiberg, Germany.
Bundeswehr Research Institute for Materials, Fuels and Lubricants, 85435 Erding, Germany.
Polymers (Basel). 2021 Dec 15;13(24):4402. doi: 10.3390/polym13244402.
The present study investigates different elastomers with regard to their behavior towards liquids such as moisture, fuels, or fuel components. First, four additively manufactured materials are examined in detail with respect to their swelling in the fuel component toluene as well as in water. The chemical nature of the materials is elucidated by means of infrared spectroscopy. The experimentally derived absorption curves of the materials in the liquids are described mathematically using Fick's diffusion law. The mechanical behavior is determined by uniaxial tensile tests, which are evaluated on the basis of stress and strain at break. The results of the study allow for deriving valuable recommendations regarding the printing process and postprocessing. Second, this article investigates the swelling behavior of new as well as thermo-oxidatively aged elastomers in synthetic fuels. For this purpose, an analysis routine is presented using sorption experiments combined with gas chromatography and mass spectrometry and is thus capable of analyzing the swelling behavior multifacetted. The transition of elastomer constituents into the surrounding fuel at different aging and sorption times is determined precisely. The change in mechanical properties is quantified using density measurements, micro Shore A hardness measurements, and the parameters stress and strain at break from uniaxial tensile tests.
本研究考察了不同弹性体对诸如水分、燃料或燃料成分等液体的反应。首先，详细研究了四种增材制造材料在燃料成分甲苯以及水中的溶胀情况。通过红外光谱法阐明了材料的化学性质。利用菲克扩散定律对材料在液体中的实验所得吸收曲线进行数学描述。通过单轴拉伸试验确定力学行为，并根据断裂应力和应变进行评估。该研究结果有助于得出有关打印过程和后处理的宝贵建议。其次，本文研究了新型以及热氧化老化弹性体在合成燃料中的溶胀行为。为此，提出了一种结合吸附实验与气相色谱和质谱的分析程序，从而能够多方面分析溶胀行为。精确测定了不同老化和吸附时间下弹性体成分向周围燃料的转移情况。使用密度测量、微型邵氏A硬度测量以及单轴拉伸试验中的断裂应力和应变参数对力学性能的变化进行量化。
