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Mechanical properties characterization of polymethyl methacrylate polymer optical fibers after thermal and chemical treatments

机译：热处理后的聚甲基丙烯酸甲酯聚合物光纤的机械性能表征

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摘要

This paper presents the dynamic mechanical analysis (DMA) in polymer optical fibers (POFs) made of Polymethyl Methacrylate (PMMA) that were submitted to different thermal and chemical treatments, namely annealing and etching processes. The prepared samples were submitted to stress-strain cycles to evaluate the Young's modulus of each fiber. Also, test with constant stress and temperature variation were performed to estimate the thermal expansion coefficient of the fibers submitted to each thermal and chemical treatment. The samples were also tested under different temperature, humidity and strain cycle frequency conditions to analyze the variation of their mechanical properties with these parameters. Results show that the thermal and chemical treatments lead to a reduction of Young's modulus and an increase of the thermal expansion coefficient, which can produce sensors based on intensity variation or fiber Bragg grating with higher dynamic range, stress and temperature sensitivity. Furthermore, the etching and annealing resulted in fiber that presents lower Young's modulus variation with temperature, humidity and strain cycling frequency in most cases. However, the annealing made under water and the combinations of etching and annealing resulted in POFs with higher modulus variation with humidity, which enable their application as intensity variation or FBG-based sensors in humidity/moisture assessment
机译：本文介绍了由聚甲基丙烯酸甲酯（PMMA）制成的聚合物光纤（POF）的动态力学分析（DMA），该聚合物光纤经过了不同的热处理和化学处理，即退火和蚀刻工艺。将制备的样品进行应力-应变循环以评估每根纤维的杨氏模量。而且，进行了具有恒定应力和温度变化的测试，以估计经受每种热处理和化学处理的纤维的热膨胀系数。还在不同的温度，湿度和应变循环频率条件下对样品进行了测试，以分析其机械性能随这些参数的变化。结果表明，热处理和化学处理导致杨氏模量降低和热膨胀系数增加，从而可以生产基于强度变化或光纤布拉格光栅的传感器，其动态范围，应力和温度敏感性更高。此外，在大多数情况下，蚀刻和退火导致纤维呈现出较低的杨氏模量随温度，湿度和应变循环频率的变化。但是，在水下进行的退火以及蚀刻和退火的组合导致POF在湿度下具有较高的模量变化，从而使其可以用作强度变化或基于FBG的湿度/湿度评估传感器

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