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The effects of gamma-ray irradiation on organic materials of different conjugation lengths

机译：γ射线辐照对不同共轭长度的有机材料的影响

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摘要

The radiation resistance of organic electro-optic and optoelectronic materials of different conjugation lengths for space applications is receiving increased attention. Earlier investigation reported that guest-host (G-H) poled polymer EO modulator devices composed of a phenyltetraene bridge-type chromophore in amorphous polycarbonate (CLD/APC) did not exhibit a decrease in EO response (i.e., an increase in modulation-switching voltage- V_π) following irradiation by low dose [10-160 krad(Si)] ~(60)Co gamma-rays. In this work, the post-irradiation responses of ~(60)Co gamma-rays on CLD1/APC thin films are examined by various chemical and spectroscopic methods including: a solubility test, thin-layer chromatography, proton nuclear magnetic resonance spectroscopy, UV-vis absorption, and infra-red absorption. The results indicate that CLD1 and APC did not decompose under gamma-ray irradiation at dose levels ranging from 66-274 krad(Si) and from 61-154 krad(Si), respectively which support the previously reported data. A comparison with an in situ proton irradiated DRI/PMMA material is also presented.
机译：不同共轭长度的有机电光和光电子材料在空间应用中的抗辐射性受到越来越多的关注。较早的研究报告称，由无定形聚碳酸酯（CLD / APC）中的苯基四烯桥型生色团组成的来宾-宿主（GH）极化聚合物EO调制器器件未表现出EO响应降低（即，调制开关电压增加-低剂量[10-160 krad（Si）]〜（60）Coγ射线辐照后产生V_π）。在这项工作中，通过各种化学和光谱方法检查了CLD1 / APC薄膜上〜（60）Coγ射线的辐照后响应，包括溶解度测试，薄层色谱，质子核磁共振谱，UV -可见吸收和红外吸收。结果表明，CLD1和APC分别在66-274 krad（Si）和61-154 krad（Si）的剂量水平下在伽马射线辐照下不会分解，这支持了先前报道的数据。还提出了与原位质子辐照DRI / PMMA材料的比较。

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